WO2017033978A1 - 溶接方法及びアーク溶接装置 - Google Patents
溶接方法及びアーク溶接装置 Download PDFInfo
- Publication number
- WO2017033978A1 WO2017033978A1 PCT/JP2016/074690 JP2016074690W WO2017033978A1 WO 2017033978 A1 WO2017033978 A1 WO 2017033978A1 JP 2016074690 W JP2016074690 W JP 2016074690W WO 2017033978 A1 WO2017033978 A1 WO 2017033978A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- welding
- base material
- arc
- current
- wire
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Definitions
- the present invention relates to a welding method and an arc welding apparatus.
- the gas shielded arc welding method is a technique in which an arc is generated between the welding wire fed to the welded part of the base material and the base material, and the base material is welded by the heat of the arc. In order to prevent oxidation of the base metal, welding is performed while injecting an inert gas around the weld. If it is a thin plate of about 5 mm, the butt joint of the base material can be welded in one pass.
- the base metal cannot be welded in one pass by the conventional gas shield arc welding method. For this reason, thick plates are welded by multilayer welding in which a plurality of welding operations are repeated. However, in multi-layer welding, an increase in the number of welding steps becomes a problem. In addition, the amount of heat input becomes large, and deformation of the base material and embrittlement of the welded part become problems.
- one-pass welding of a thick plate can be realized by feeding a welding wire at about 5 to 100 m / min and supplying a large current of 300 A or more.
- a concave melted portion is formed in the base material by the heat of the arc, and the tip of the welding wire enters a space surrounded by the melted portion.
- a space surrounded by the concave melted portion is referred to as a buried space
- an arc generated between the tip of the welding wire that has entered the buried space and the base material or the melted portion is appropriately referred to as a buried arc.
- An object of the present invention is to provide a welding method capable of improving the work efficiency of welding by achieving through welding in butt welding by GMA (Gas Metal Arc) welding.
- the molten metal of the base metal and the welding wire that are melted by the heat of the arc increases, and the molten metal undulates due to the arc.
- the molten metal greatly undulates, and the meandering and sagging of the beads occur.
- the present invention has been made in view of such circumstances, and its purpose is to suppress undulation of molten metal in buried arc welding even when gas shielded arc welding is performed using a large current of 300 A or more,
- An object of the present invention is to provide a welding method and an arc welding apparatus capable of preventing the occurrence of bead disturbance and sagging.
- the first base material and the second base material are prepared, and the first end surface of the first base material and the second end surface of the second base material face each other.
- an arc is formed between the welding wire, the first base material, and the second base material, and the first base material and the second base material are generated by the heat of the arc.
- the first base material and the second base material are welded by forming a melting region in the first part.
- an arc is formed in a state where the welding wire penetrates to the region surrounded by the melting region, so that the melting region becomes the first base material and the second base material. It is formed so as to penetrate the material in the thickness direction.
- the inventors of the present invention have studied a method for achieving through welding by GMA welding. As a result, it has been found that penetration welding can be achieved by performing welding while maintaining a state in which an arc is formed with a welding wire penetrating into a region surrounded by a melting region (buried arc state). It was.
- the arc is formed in a state where the welding wire penetrates to the region surrounded by the melting region, so that the melting region penetrates the first base material and the second base material in the thickness direction. Formed. Therefore, according to the welding method of the present invention, it is possible to improve the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- the first base material and the second base material are prepared, and the first end surface of the first base material and the second end surface of the second base material face each other.
- an arc is formed between the welding wire, the first base material, and the second base material, and the first base material and the second base material are generated by the heat of the arc.
- the first base material and the second base material are welded by forming a melting region in the first part.
- the position of the tip of the welding wire is the thickness of the first base material and the second base material in a state where the welding wire has penetrated to the region surrounded by the melting region.
- the arc is formed while reciprocating between the first depth and the second depth deeper than the first depth in the direction, so that the melting region penetrates the first base material and the second base material in the thickness direction. To be formed.
- the inventors of the present invention have studied a method for achieving through welding by GMA welding. As a result, the following knowledge was obtained and the present invention was conceived. By performing welding while maintaining a state in which an arc is formed in a state where the welding wire has entered the region surrounded by the melting region (buried arc state), it is easy to achieve through welding.
- an arc is formed while the position of the tip of the welding wire reciprocates in the thickness direction of the first base material and the second base material in a state where the welding wire has penetrated to the region surrounded by the melting region.
- the melting region is formed so as to penetrate the first base material and the second base material in the thickness direction. Therefore, according to the welding method of the present invention, it is possible to improve the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- the welding wire penetrates to the first depth, and the mode of transition to the melted region formed by melting the welding wire is formed. May be repeated between the state of rotating transition and the state where the welding wire penetrates to the second depth and the transition form is other than the transition of rotating.
- the tip of the welding wire rotates around an axis along the thickness direction of the first base material and the second base material. Therefore, the formed arc rotates around the axis.
- the welding wire is in a shallow state (up to the first depth) and is shifted to the rotating state, the heat of the arc is easily supplied to a region where the overlap is likely to occur. As a result, the occurrence of overlap is more reliably suppressed.
- the first base material and the second base material are prepared, and the first end surface of the first base material and the second end surface of the second base material face each other.
- an arc is formed between the welding wire, the first base material, and the second base material, and the first base material and the second base material are generated by the heat of the arc.
- the first base material and the second base material are welded by forming a melting region in the first part.
- an arc is formed while the state in which the welding wire has entered the region surrounded by the melting region and the state in which the welding wire is separated from the region surrounded by the melting region are repeated.
- the melting region is formed so as to penetrate the first base material and the second base material in the thickness direction.
- the inventors of the present invention have studied a method for achieving through welding by GMA welding. As a result, the following knowledge was obtained and the present invention was conceived. By performing welding in a state where an arc is formed in a state where the welding wire has entered the region surrounded by the melting region (buried arc state), it is easy to achieve through welding.
- the arc is formed while the buried arc state and the buried arc are eliminated, so that the molten region penetrates the first base material and the second base material in the thickness direction. Formed. Therefore, according to the welding method of the present invention, it is possible to improve the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- the first base material and the second base material in the step of welding the first base material and the second base material by GMA welding, the first base material and the second base material with respect to the width of the molten region in the direction perpendicular to the first end surface and the second end surface.
- the first base material and the second base material may be welded so that the thickness of the base material becomes 1.3 or less.
- the width of the welded region refers to the width when the molten region is viewed in a plane from the side where the welding wire penetrates in the direction perpendicular to the main surfaces of the first and second base materials. .
- the welding wire feed speed increases or decreases, so that the welding wire enters the region surrounded by the melting region, and the melting The state of being separated from the region surrounded by the region may be repeated.
- the welding state can be controlled so as to repeat the buried arc state and the state in which the buried arc is eliminated.
- the feeding speed of the welding wire in the step of welding the first base material and the second base material, the feeding speed of the welding wire may be 30 m / min or more. By doing in this way, it becomes easy to maintain a buried arc state.
- the feeding speed of a welding wire exceeds 60 m / min, there exists a possibility that the transition state of fusion may be rotating transition. As a result, the penetration becomes shallow and it may be difficult to achieve through welding. Therefore, the feeding speed of the welding wire may be 60 m / min or less. Further, from the viewpoint of more reliably avoiding the shallow penetration, the feeding speed of the welding wire may be 50 m / min or less.
- a first base material and a second base material having a thickness of 9 mm or more and 30 mm or less may be prepared.
- the achievement of through welding by GMA welding is particularly effective from the viewpoint of improving work efficiency in a base material having a thickness of 9 mm or more.
- the thickness of the first base material and the second base material may be 9 mm or more and 30 mm or less.
- the first base material and the second base material in which no groove is formed may be welded.
- the welding method of the present invention it is possible to weld a base material in which no groove is formed.
- the groove it is necessary to fill a region where the groove is formed at the time of welding. Therefore, for example, the distortion of the base material may increase due to an increase in the amount of filler material supplied to the weld.
- the first base material and the second base material are welded in a state where the voltage drop with respect to the current increase of 100 A is 4 V or more and 20 V or less. Also good.
- the current value increases, the welding wire melting rate increases, and the arc length increases.
- the current value is decreased, the welding wire melting rate is decreased, and the arc length is shortened (arc length self-control action).
- the voltage drop exceeds 20 V, the current variation is small with respect to the arc length variation due to a disturbance factor, so that the self-control action of the arc length is small. As a result, it becomes difficult to maintain the state of the buried arc. By setting the voltage drop to 20 V or less, the arc length self-control action is maintained, and it becomes easy to maintain the buried arc state.
- the voltage drop may be 5 V or more.
- the voltage drop may be 15 V or less.
- the welding wire may be a solid wire.
- the diameter of the welding wire may be 0.9 mm or greater and 1.6 mm or less. This makes it easy to maintain a buried arc state during welding.
- the welding method according to the present invention generates an arc between the tip of the welding wire and the welded portion by feeding a welding wire to the welded portion of the base material and supplying a welding current to the welded wire.
- a consumable electrode type welding method for welding the base material wherein the tip portion is in a space surrounded by a concave melted portion formed in the base material by an arc generated between the tip portion and the welded portion.
- the welding wire is fed at a speed at which the welding current enters, and the welding current is varied so that the frequency of the welding current is 10 Hz to 1000 Hz, the average current is 300 A or more, and the current amplitude is 50 A or more.
- the tip of the welding wire enters the buried space surrounded by the concave melted portion, and a buried arc is generated. Specifically, the tip of the welding wire is surrounded by the melted portion, and by periodically changing the welding current, the position of the wire tip in the buried space can be moved up and down. An arc is generated between the bottom and the side.
- molten metal in buried arc welding may be greatly undulated, but by periodically varying the welding current at the frequency, average current, and current amplitude, the molten metal is finer at a higher frequency than a large waving cycle. It can be vibrated to suppress large undulations of the molten metal, and one-pass welding of a thick plate can be realized.
- the welding method according to the present invention generates an arc between the tip of the welding wire and the welded portion by feeding a welding wire to the welded portion of the base material and supplying a welding current to the welded wire.
- the tip of the welding wire enters the buried space surrounded by the concave melted portion, and a buried arc is generated. Specifically, the tip of the welding wire is surrounded by the melted portion, and by periodically changing the welding current, the position of the wire tip in the buried space can be moved up and down. An arc is generated between the bottom and the side.
- molten metal in buried arc welding may wavy greatly, but by periodically changing the welding current, the first state where the arc flies to the bottom of the concave melted part and the arc to the side of the melted part. It is possible to periodically change the second state in which the metal flies, suppress the undulation of the molten metal, and realize one-pass welding of the thick plate.
- the welding method according to the present invention varies the first state and the second state at a frequency of 10 Hz to 1000 Hz.
- the molten metal is finely vibrated at a higher frequency than a large undulation cycle, and the large undulation of the molten metal is suppressed. Can do.
- the first state includes a droplet transfer form of drop transfer
- the second state includes a liquid column and an arc formed at the tip of the welding wire swinging like a pendulum.
- a droplet transfer form
- the present invention by periodically changing the welding current, it is possible to periodically change the drop transition in which the arc flies to the bottom of the concave melted portion and the pendulum transition, and the undulation of the molten metal can be performed. Can be suppressed.
- the first state includes a droplet transfer mode of drop transfer
- the second state includes a droplet transfer mode of rotation transfer
- the drop transition in which the arc flies to the bottom of the concave melted portion and the rotating transition in which the arc flies to the side of the melted portion are periodically fluctuated. And the undulation of the molten metal can be suppressed.
- the first state includes a droplet transfer form in which a liquid column and an arc formed at the tip of the welding wire swing in a pendulum shape, and the second state is rotating. Includes droplet transfer mode of transfer.
- the pendulum transition in which the arc flies to the bottom of the concave melted portion and the rotating transition in which the arc flies to the side of the melted portion are periodically fluctuated. And the undulation of the molten metal can be suppressed.
- the welding method according to the present invention varies the welding current so that the frequency of the welding current is 10 Hz to 1000 Hz, the average current is 300 A or more, and the current amplitude is 50 A or more.
- the frequency of the welding current is 50 Hz to 300 Hz
- the average current is 300 A to 1000 A
- the current amplitude is 100 A to 500 A.
- the frequency of the welding current is 50 Hz to 300 Hz
- the average current is 300 A to 1000 A
- the current amplitude is 100 A to 500 A
- An arc welding apparatus includes a wire feeding portion that feeds a welding wire to a welded portion of a base material, and a power supply portion that supplies a welding current to the welding wire, and the welding current is supplied to the welding wire.
- a consumable electrode type arc welding apparatus for generating an arc between a tip portion and a welded portion of the welding wire by welding to weld the base material, wherein the wire feeding portion includes the tip portion and The welding wire is fed at a speed at which the tip portion enters a space surrounded by a concave melted portion formed in the base material by an arc generated between the welded portions, and the power supply unit
- the welding current is varied so that the frequency of the current is 10 Hz to 1000 Hz, the average current is 300 A or more, and the current amplitude is 50 A or more.
- the tip of the welding wire enters the buried space surrounded by the concave melted portion, and a buried arc is generated.
- the tip of the welding wire is surrounded by the molten portion, and the molten metal may be greatly undulated, but the welding current is periodically changed at the frequency, the average current, and the current amplitude.
- the molten metal can be finely vibrated at a frequency higher than a large waving cycle, and the large undulation of the molten metal can be suppressed, and one-pass welding of a thick plate can be realized.
- An arc welding apparatus includes a wire feeding portion that feeds a welding wire to a welded portion of a base material, and a power supply portion that supplies a welding current to the welding wire, and the welding current is supplied to the welding wire.
- a consumable electrode type arc welding apparatus for generating an arc between a tip portion and a welded portion of the welding wire by welding to weld the base material, wherein the wire feeding portion includes the tip portion and The welding wire is fed at a speed at which the tip portion enters a space surrounded by a concave melted portion formed in the base material by an arc generated between the welded portions, and the power supply unit
- the first state in which an arc is generated between the tip and the bottom of the melted portion and the second state in which an arc is generated between the tip and the side of the melted portion are periodically changed. Periodically fluctuating That.
- the tip of the welding wire enters the buried space surrounded by the concave melted portion, and a buried arc is generated.
- the tip of the welding wire is surrounded by the melted portion, and the molten metal may be greatly undulated, but by periodically changing the welding current, an arc is formed at the bottom of the concave melted portion. It is possible to periodically change the first state in which the arc flies and the second state in which the arc flies to the side of the molten portion, thereby suppressing the undulation of the molten metal, and realizing one-pass welding of the thick plate.
- the welding method of the present invention it is possible to provide a welding method capable of improving the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- FIG. 3 is a schematic diagram for explaining a welding method in the first embodiment.
- FIG. 3 is a schematic diagram for explaining a welding method in the first embodiment.
- FIG. 9 is a schematic diagram for explaining a welding method in a second embodiment.
- FIG. 9 is a schematic diagram for explaining a welding method in a second embodiment.
- FIG. 10 is a schematic diagram showing a state in which a welding wire has penetrated deeply in a welding process in a third embodiment. It is the schematic which shows the state which the welding wire penetrate
- FIG. 1 It is a timing chart which shows the control state of electric current, a voltage, and the feeding speed of a welding wire. It is the schematic which shows the state which the welding wire penetrate
- FIG. It is the schematic which shows the state which the welding wire penetrate
- FIG. It is the schematic which shows the state which the buried arc eliminated in the welding process in Embodiment 5.
- FIG. It is the schematic which shows the buried arc state of the welding process in Embodiment 6.
- FIG. It is the schematic which shows the state which the buried arc of the welding process in Embodiment 6 eliminated.
- FIG. 7 It is a schematic diagram which shows the welding method which concerns on this Embodiment 7.
- FIG. It is a graph which shows the experimental result regarding stabilization of a buried space and a bead shape with a photograph. It is a table
- surface which shows the experimental result regarding stabilization of a buried space and a bead shape with a schematic diagram. It is a graph which shows the conditions of the welding current and voltage which implement
- a base material preparation process is first implemented as process (S10).
- a pair of base materials to be joined by welding is prepared.
- a first base material 50 and a second base material 60 are prepared.
- the first base material 50 and the second base material 60 are steel plates made of steel such as mild steel, carbon steel for machine structure, alloy steel for machine structure, for example.
- the thickness of the steel plate is, for example, 9 mm or more and 30 mm or less.
- first base material 50 and second base material 60 prepared in step (S10) are set in welding apparatus 100.
- the welding apparatus 100 includes a torch 19, a power supply 30, and a wire feeding device 29.
- the torch 19 includes a contact tip 17 and a nozzle 18 having a hollow cylindrical shape surrounding the contact tip 17.
- the contact chip 17 is made of a conductive material (metal) such as a copper alloy.
- the contact tip 17 guides the welding wire 15 while being in contact with the welding wire 15 that is a filler material. That is, the welding wire 15 and the contact tip 17 are electrically connected.
- the welding wire 15 functions as a consumable electrode.
- the welding wire 15 is a solid wire.
- the diameter of the welding wire 15 is 0.9 mm or more and 1.6 mm or less, for example.
- the nozzle 18 forms a flow path for flowing shield gas between the nozzle 18 and the contact tip 17.
- the welding wire 15 is located in a region including the central axis of the nozzle 18.
- the wire feeding device 29 feeds the welding wire 15 into the nozzle 18.
- the power supply 30 is electrically connected to the contact chip 17 via the wiring 34.
- the power supply 30 is electrically connected to the second base material 60 via the wiring 64.
- the first base material 50 has one main surface 52, the other main surface 53, and a first end surface 51.
- Second base material 60 has one main surface 62, the other main surface 63, and a second end surface 61.
- the first base material 50 and the second base material 60 are arranged so that the first end face 51 and the second end face 61 face each other.
- the first base material 50 and the second base material 60 are arranged so that the first end face 51 and the second end face 61 are in contact with each other. No groove is formed in the first base material 50 and the second base material 60. That is, the first end surface 51 and the second end surface 61 are parallel throughout the entire thickness direction.
- a welding process is performed as a process (S30).
- the first base material 50 and the second base material 60 arranged in step (S20) are welded by GMA welding.
- the voltage between the first base material 50 and the second base material 60 and the welding wire 15 is supplied from the power source 30. Is applied, the arc 11 is formed between the welding wire 15 and the first base material 50 and the second base material 60.
- a shielding gas such as carbon dioxide gas is supplied into the nozzle 18 and flows through the space between the contact tip 17 and the inner peripheral surface of the nozzle 18.
- shield gas is discharged along the arrow G from the exit of the nozzle 18, and the arc 11 and external air are interrupted
- the molten region 12 is formed in the first base material 50 and the second base material 60 by the heat of the arc 11 formed in this way.
- the arc 11 is formed in a state where the welding wire 15 has penetrated to the region surrounded by the melting region 12 (buried arc state), so that the melting region 12 causes the first base material 50 and the second base material 60 to move. It is formed so as to penetrate in the thickness direction. That is, in a state where the tip 15A of the welding wire 15 that has entered from one main surface 52 of the first base material 50 and one main surface 62 of the second base material 60 is located in a region surrounded by the melting region 12. , Arc 11 is formed. The molten region 12 is exposed on the other main surface 53 of the first base material 50 and the other main surface 63 of the second base material 60.
- the region where the melted region 12 is formed moves.
- the previously formed molten region 12 solidifies as the temperature decreases.
- the melted region 12 is sequentially formed along the extending direction of the region to be welded (the region where the first end surface 51 and the second end surface 61 face each other), and the formed melted region 12 is solidified. The welding of the first base material 50 and the second base material 60 in the form is completed.
- the arc 11 is formed in a state where the welding wire 15 has penetrated to the region surrounded by the melting region 12, so that the melting region 12 becomes the first base material 50. And it forms so that the 2nd preform
- the feeding speed of the welding wire 15 shall be 30 m / min or more. Thereby, it becomes easy to maintain a buried arc state.
- the feeding speed of the welding wire 15 can be set within a range of 5 to 100 m / min.
- the first base material 50 and the second base material 60 are welded in a state where the voltage drop with respect to the current increase of 100 A is 4 V or more and 20 V or less.
- the voltage drop is preferably 5 V or more.
- the voltage drop is preferably 15 V or less.
- Embodiment 2 Next, the welding method in Embodiment 2, which is another embodiment of the present invention, will be described.
- the welding method according to the second embodiment is basically performed in the same manner as in the first embodiment, and has the same effects. However, the welding method of the second embodiment is different from that of the first embodiment in the shape of the end face of the base material.
- first base material 50 and second base material 60 in which groove 70 is formed are prepared.
- the groove 70 is formed on one main surface 52, 62 side of the first base material 50 and the second base material 60.
- the groove 70 includes a corner portion of the first base material 50 to which the first end surface 51 and the one main surface 52 are connected, and a second base material 60 to which the second end surface 61 and the one main surface 62 are connected. It is formed so as to remove the corners.
- step (S20) when the first base material 50 and the second base material 60 are arranged so that the first end face 51 and the second end face 61 face each other, in the region corresponding to the groove 70, The distance between the first base material 50 and the second base material 60 increases as the main surfaces 52 and 62 are approached.
- base_material 60 are welded in the state in which the groove
- the region corresponding to the groove 70 is filled by welding. That is, the amount of the welding wire 15 as the filler material supplied to the melting region 12 is increased as compared with the first embodiment in which the groove 70 is not formed.
- a plurality of steel plates with different thicknesses were prepared as base materials.
- a welding apparatus 100 is used to weld steel plates having the same thickness so that the end faces of the two steel plates contact each other without forming a groove. Set.
- the feeding speed of the welding wire 15 is changed while maintaining the buried arc state, and the thickness of the steel sheet capable of through welding (thickness capable of through welding) was investigated.
- the current value, voltage value, and wire protrusion length were adjusted to values suitable for maintaining the buried arc state at each wire feed speed.
- the voltage drop with respect to the current increase of 100 A which is the external characteristic of the power supply 30, was set to 10 to 20 V or 20 V.
- the welding wire 15 a solid wire having a diameter of 1.2 mm was employed. The experimental conditions and results are shown in Table 1.
- Table 1 shows the thicknesses of steel plates that were confirmed to be capable of penetration welding by maintaining the buried arc state at various wire feed speeds.
- a negative external characteristic value means that the voltage decreases with an increase in current of 100A.
- a state in which the external characteristic value is ⁇ 20V means that the voltage decreases by 20V with respect to an increase in the welding current of 100A.
- the buried arc state can be maintained and through welding can be achieved by adjusting the current value and voltage value according to the wire feed speed.
- board thickness (thickness of a base material) which can be penetrated is increased by raising a wire feeding speed.
- the wire feed speed is preferably 30 m / min or more.
- Embodiment 3 Next, the welding method in Embodiment 3, which is another embodiment of the present invention, will be described.
- the welding method according to the third embodiment is basically performed in the same manner as in the first embodiment, and has the same effects. However, the welding method of the third embodiment is different from the case of the first embodiment in the welding process.
- the base material preparation step (S10), the base material placement step (S20), and the welding step (S30) are performed in the same procedure as in the first embodiment shown in FIG.
- FIG. 6A is a schematic diagram showing a state in which the welding wire 15 has penetrated deeply in the welding process in Embodiment 3, and FIG.
- FIG. 6B shows that the welding wire intrudes shallowly in the welding process in Embodiment 3 to transfer droplets.
- FIG. 7 is a schematic diagram showing a state in which the form is a transition to rotating, and FIG. 7 is a timing chart showing a control state of the current, voltage, and welding wire feeding speed.
- the welding step (S20) referring to FIGS. 6A and 6B, while the welding wire 15 is being fed by the wire feeding device 29, the first base material 50 and the second base material are supplied by the power source 30.
- the arc 11 is formed between the welding wire 15, the first base material 50, and the second base material 60.
- the position of the tip 15A of the welding wire 15 is in the thickness direction of the first base material 50 and the second base material 60 with the welding wire 15 penetrating into the region surrounded by the melting region 12 (buried arc state).
- the arc 11 is formed while reciprocating between the first depth and the second depth deeper than the first depth, so that the melting region 12 causes the first base material 50 and the second base material 60 to move in the thickness direction. It is formed so as to penetrate through. That is, in a state where the tip 15A of the welding wire 15 that has entered from one main surface 52 of the first base material 50 and one main surface 62 of the second base material 60 is located in a region surrounded by the melting region 12.
- the arc 11 is formed while the position of the tip 15 ⁇ / b> A reciprocates in the thickness direction of the first base material 50 and the second base material 60.
- the molten region 12 is exposed on the other main surface 53 of the first base material 50 and the other main surface 63 of the second base material 60.
- FIG. 7 the horizontal axis corresponds to time t.
- the vertical axis corresponds to the welding current I, the welding voltage V, and the feeding speed W f of the welding wire 15.
- the current I is controlled to repeat a state of high I H than state and I TH lower I L than the threshold current I TH.
- time t 1 the current I is in the state of the I H at time t 2 (time T H)
- the voltage V is V H
- the feeding rate W f is the W fH.
- the current I is the state of I L at time t 3 (time T L)
- the voltage V is lower V L than V H
- feed rate W f is smaller than W fH W fL It is said.
- the sum of the time TH and the time TL is the time T per cycle.
- the reciprocal 1 / T of T is the frequency.
- the frequency 1 / T can be, for example, 0.2 Hz or more and 2 Hz or less.
- State current I is in the state of being smaller than the threshold current I TH, as shown in FIG. 6A, the welding wire 15 (up to a second depth) deep in the thickness direction of the first base member 50 and the second base member 60 has penetrated It becomes.
- the transition form to the melted region 12 of the fusion formed by melting the welding wire 15 is a state other than the rotational transition, for example, a drop transition state, or the tip 15A of the welding wire 15 moves in a pendulum shape. It becomes the state transition (pendulum transition) state.
- the welding wire 15 is shallow (up to the first depth) in the thickness direction of the first base material 50 and the second base material 60 as shown in FIG. 6B. It will be in the state. At this time, the mode of transition to the melted region 12 of the fusion formed by melting the welding wire 15 is a state of rotating transition.
- the region near the tip 15A of the welding wire 15 is curved so as to be separated from the axis ⁇ along the thickness direction of the first base material 50 and the second base material 60. Then, the tip 15A of the welding wire 15 rotates around the axis ⁇ . Therefore, the formed arc 11 rotates around the axis ⁇ .
- an area where the occurrence of overlap is a concern (one main surface 52 of the first base material 50 and one main surface of the second base material 60). It becomes easy to supply the heat of the arc 11 to a region close to the surface 62.
- the region where the melted region 12 is formed moves.
- the previously formed molten region 12 solidifies as the temperature decreases.
- the melted region 12 is sequentially formed along the extending direction of the region to be welded (the region where the first end surface 51 and the second end surface 61 face each other), and the formed melted region 12 is solidified. The welding of the first base material 50 and the second base material 60 in the form is completed.
- the position of the tip 15A of the welding wire 15 is the first base material 50 and the second base material 50 in a state where the welding wire 15 has penetrated to the region surrounded by the melting region 12.
- the arc 11 is formed while reciprocating between the first depth and the second depth deeper than the first depth in the thickness direction of the base material 60, so that the melting region 12 is formed in the first base material 50 and the first base material 60. It is formed so as to penetrate the two base materials 60 in the thickness direction.
- the welding wire 15 penetrates shallowly (to the first depth) in the thickness direction of the first base material 50 and the second base material 60, and the welding wire 15 melts to the melting region 12 formed by melting.
- the transition form is a state of transition to rotating, and the welding wire 15 penetrates deeply (to the second depth), and the transition form is repeated in a state other than the transition of rotating.
- the welding wire 15 enters a state where the welding wire 15 has entered shallowly, the region where the occurrence of overlap is likely to occur (one main surface 52 of the first base material 50 and one of the second base materials 60).
- the heat of the arc 11 is easily supplied to the region near the main surface 62. Therefore, the occurrence of overlap is suppressed. And by repeating these states, through welding can be achieved while suppressing the occurrence of overlap. Therefore, according to the welding method of the present embodiment, it is possible to improve the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- the feeding speed of the welding wire 15 is preferably 30 m / min or more. Thereby, it becomes easy to maintain a buried arc state.
- Embodiment 4 Next, the welding method in Embodiment 4, which is another embodiment of the present invention, will be described.
- the welding method according to the fourth embodiment is basically performed in the same manner as in the third embodiment, and has the same effects. However, the welding method of the fourth embodiment is different from that of the third embodiment in the shape of the end face of the base material.
- FIG. 8A is a schematic diagram showing a state in which the welding wire 15 has penetrated deeply in the welding process in Embodiment 4, and FIG. 8B shows that the welding wire 15 in the welding process in Embodiment 4 has entered shallowly and is melted. It is the schematic which shows the state which the transfer form of a droplet is rotating transfer.
- step (S10) first base material 50 and second base material 60 in which groove 70 is formed are prepared. The groove 70 is formed on one main surface 52, 62 side of the first base material 50 and the second base material 60.
- the groove 70 includes a corner portion of the first base material 50 to which the first end surface 51 and the one main surface 52 are connected, and a second base material 60 to which the second end surface 61 and the one main surface 62 are connected. It is formed so as to remove the corners. Therefore, in the step (S20), when the first base material 50 and the second base material 60 are arranged so that the first end face 51 and the second end face 61 face each other, in the region corresponding to the groove 70, The distance between the first base material 50 and the second base material 60 increases as the main surfaces 52 and 62 are approached.
- the first base material 50 and the second base material 60 are welded with the groove 70 formed.
- the region corresponding to the groove 70 is filled by welding. That is, the amount of the welding wire 15 as the filler material supplied to the melting region 12 is increased as compared with the third embodiment in which the groove 70 is not formed.
- the welding method of the present embodiment is suitable.
- the welding current, welding voltage, and welding wire feeding speed are increased to allow the welding wire to enter shallowly, and the welding current, welding voltage, and welding wire feeding speed are decreased.
- the welding method of the present invention is not limited to this.
- the welding wire feed speed and welding current are increased so that the welding wire penetrates deeply, and the welding wire feeding speed and welding current is reduced to enter the welding wire shallowly penetrating.
- the position of the tip of the welding wire may be reciprocated in the thickness direction of the base material.
- FIG. 9A is a schematic diagram showing a buried arc state in the welding process in the fifth embodiment
- FIG. 9B is a schematic diagram showing a state in which the buried arc is eliminated in the welding process in the first embodiment
- FIG. 6 is a timing chart showing a control state of a feeding speed, current, and voltage of a wire 15.
- the welding step (S20) referring to FIG. 9A and FIG. 9B, while the welding wire 15 is being fed by the wire feeding device 29, the first base material 50 and the second base material are supplied by the power source 30.
- the arc 11 is formed between the welding wire 15, the first base material 50, and the second base material 60.
- the state in which the welding wire 15 has entered the region surrounded by the melting region 12 (embedded arc state) and the state in which the welding wire 15 is separated from the region surrounded by the molten region 12 (state where the buried arc has been eliminated) are repeated.
- the melting region 12 is formed so as to penetrate the first base material 50 and the second base material 60 in the thickness direction. That is, the arc 11 is formed while the state in which the tip 15A of the welding wire 15 is located in the region surrounded by the melting region 12 and the state located outside the region surrounded by the melting region 12 are repeated.
- the molten region 12 is exposed on the other main surface 53 of the first base material 50 and the other main surface 63 of the second base material 60.
- FIG. 10 the horizontal axis corresponds to time t.
- the vertical axis corresponds to the feeding speed W f , the welding current I, and the welding voltage V of the welding wire 15.
- feed speed W f is the state of W fL, is controlled to repeat a state of a large W fH than W fL.
- time T H time T H
- the voltage I is set to I H.
- time T L time T L in which the feed speed W f is in the state of W fL (time T L )
- the current I is set to I L smaller than I H.
- Voltage V is maintained at a constant value V C.
- the sum of the time T L and time T H is the time T per cycle.
- the reciprocal 1 / T of T is the frequency.
- the frequency 1 / T can be, for example, 0.2 Hz or more and 2 Hz or less.
- the welding wire 15 When the feed speed W f is W fH , the welding wire 15 enters a region surrounded by the melting region 12 (embedded arc state) as shown in FIG. 9A. On the other hand, in the state of W fL where W f is smaller than W fH , as shown in FIG. 9B, the welding wire 15 is separated from the region surrounded by the melting region 12 (the state where the buried arc is eliminated).
- the region where the melted region 12 is formed moves.
- the previously formed molten region 12 solidifies as the temperature decreases.
- the melted region 12 is sequentially formed along the extending direction of the region to be welded (the region where the first end surface 51 and the second end surface 61 face each other), and the formed melted region 12 is solidified. The welding of the first base material 50 and the second base material 60 in the form is completed.
- the arc 11 is formed while repeating the buried arc state and the state in which the buried arc is eliminated, so that the melting region 12 becomes the first base material 50 and It is formed so as to penetrate through the second base material 60 in the thickness direction.
- the arc 11 is formed in a state where the buried arc is eliminated, so that the width of the arc 11 (width in the direction perpendicular to the first end face 51 and the second end face 61) is increased and the arc is increased.
- 11 is formed in a region close to one main surface 52 of the first base material 50 and one main surface 62 of the second base material 60. Therefore, the heat of the arc 11 is easily supplied to a region where the occurrence of overlap is a concern (a region close to one main surface 52 of the first base material 50 and one main surface 62 of the second base material 60). Therefore, the occurrence of overlap is suppressed.
- FIG. 9B the arc 11 is formed in a state where the buried arc is eliminated, so that the width of the arc 11 (width in the direction perpendicular to the first end face 51 and the second end face 61) is increased and the arc is increased.
- 11 is formed in a region close to one main surface 52 of the first base material 50 and one main surface
- arc 11 is formed in a buried arc state, so that the width of arc 11 is reduced and arc 11 becomes the other main surface 53 and second base material of first base material 50. 60 is formed in a region close to the other main surface 63. Therefore, it is easy to achieve through welding. And by repeating these states, through welding can be achieved while suppressing the occurrence of overlap. Therefore, according to the welding method of the present embodiment, it is possible to improve the work efficiency of welding by achieving through welding in butt welding by GMA welding.
- the first base material 50 and the second base material 60 with respect to the width W of the molten region 12 in the direction perpendicular to the first end face 51 and the second end face 61 are referred to.
- the first base material 50 and the second base material 60 are preferably welded so that the thickness H is 1.3 or less. Thereby, generation
- Embodiment 6 Next, the welding method in Embodiment 6, which is another embodiment of the present invention, will be described.
- the welding method of the sixth embodiment is basically performed in the same manner as in the fifth embodiment, and has the same effect. However, the welding method of the sixth embodiment is different from that of the fifth embodiment in the shape of the end face of the base material.
- FIG. 11A is a schematic diagram showing a buried arc state in the welding process in the sixth embodiment
- FIG. 11B is a schematic diagram showing a state in which the buried arc is eliminated in the welding process in the sixth embodiment.
- step (S10) first base material 50 and second base material 60 in which groove 70 is formed are prepared.
- the groove 70 is formed on one main surface 52, 62 side of the first base material 50 and the second base material 60.
- the groove 70 includes a corner portion of the first base material 50 to which the first end surface 51 and the one main surface 52 are connected, and a second base material 60 to which the second end surface 61 and the one main surface 62 are connected. It is formed so as to remove the corners. Therefore, in the step (S20), when the first base material 50 and the second base material 60 are arranged so that the first end face 51 and the second end face 61 face each other, in the region corresponding to the groove 70, The distance between the first base material 50 and the second base material 60 increases as the main surfaces 52 and 62 are approached.
- the welding method of the present embodiment is suitable.
- the method in which the buried arc state and the state in which the buried arc has been eliminated is repeated by increasing / decreasing the feeding speed of the welding wire has been described.
- the welding method of the present invention is not limited to this. I can't. For example, when the welding voltage is increased or decreased, the buried arc state and the state where the buried arc is eliminated may be repeated. *
- FIG. 12 is a schematic diagram showing one configuration of the arc welding apparatus according to the seventh embodiment.
- the arc welding apparatus according to the seventh embodiment is a consumable electrode type gas shielded arc welding machine capable of butt welding a base material 704 having a thickness of 9 to 30 mm in one pass, including a welding power source 701, a torch 702 and a wire feeding unit 703 are provided.
- the torch 702 is made of a conductive material such as a copper alloy, and has a cylindrical shape that guides the welding wire 705 to the welded portion of the base material 704 and supplies a welding current Iw necessary for generating the arc 707 (see FIG. 16).
- Contact chip The contact tip contacts a welding wire 705 that passes through the inside of the contact tip, and supplies a welding current Iw to the welding wire 705.
- the torch 702 has a hollow cylindrical shape surrounding the contact tip, and has a nozzle for injecting a shielding gas to the welded portion.
- the shield gas is for preventing oxidation of the base material 704 and the welding wire 705 melted by the arc 707.
- the shield gas is, for example, carbon dioxide, a mixed gas of carbon dioxide and argon, an inert gas such as argon, or the like.
- the welding wire 705 is, for example, a solid wire and has a diameter of 0.9 mm to 1.6 mm and functions as a consumable electrode.
- the welding wire 705 is, for example, a pack wire housed in a pail pack in a spirally wound state, or a reel wire wound around a wire reel.
- the wire feeding unit 703 includes a feeding roller that feeds the welding wire 705 to the torch 702, and a motor that rotates the feeding roller.
- the wire feeding unit 703 pulls out the welding wire 705 from the wire reel by rotating the feeding roller, and supplies the drawn welding wire 705 to the torch 702.
- the feeding method of the welding wire 705 is an example, and is not particularly limited.
- a welding power source 701 is connected to a contact tip and a base material 704 of the torch 702 via a power supply cable, and supplies a power supply unit 711 that supplies a welding current Iw, and a feed rate control unit that controls a feed rate of the welding wire 705. 712.
- the power supply unit 711 is a power supply having a constant voltage characteristic, and includes a power supply circuit 711a that outputs a DC current subjected to PWM control, an output voltage setting circuit 711b, a frequency setting circuit 711c, a current amplitude setting circuit 711d, an average current setting circuit 711e, and a voltage.
- a detection unit 711f, a current detection unit 711g, and a comparison circuit 711h are provided.
- the voltage detection unit 711f detects the welding voltage Vw and outputs a voltage value signal Ed indicating the detected voltage value to the comparison circuit 711h.
- the current detection unit 711g detects, for example, a welding current Iw supplied from the welding power source 701 to the welding wire 705 via the torch 702 and flowing through the arc 707, and outputs a current value signal Id indicating the detected current value as an output voltage setting circuit. To 711b.
- the frequency setting circuit 711c outputs a frequency setting signal for setting a frequency for periodically changing the welding voltage Vw and the welding current Iw between the base material 704 and the welding wire 705 to the output voltage setting circuit 711b.
- the frequency setting circuit 711c is a frequency setting signal indicating a frequency of 10 Hz to 1000 Hz, preferably a frequency of 50 Hz to 300 Hz, more preferably a frequency of 80 Hz to 200 Hz. Is output.
- the current amplitude setting circuit 711d outputs an amplitude setting signal for setting the amplitude of the welding current Iw that varies periodically to the output voltage setting circuit 711b.
- the current amplitude setting circuit 711d exhibits a current amplitude of 50 A or more, preferably a current amplitude of 100 A or more and 500 A or less, more preferably a current amplitude of 200 A or more and 400 A or less. Outputs amplitude setting signal.
- the average current setting circuit 711e outputs an average current setting signal for setting the average current of the welding current Iw that varies periodically to the output voltage setting circuit 711b and the feed speed control unit 712.
- the average current setting circuit 711e has an average current of 300A or more, preferably an average current of 300A to 1000A, more preferably an average current of 500A to 800A.
- An average current setting signal indicating is output.
- the output voltage setting circuit 711b Based on the current value signal Id, the frequency setting signal, the amplitude setting signal, and the average current setting signal output from each unit, the output voltage setting circuit 711b makes the welding current Iw have the target frequency, current amplitude, and average current. For example, an output voltage setting signal Ecr indicating a target voltage having an arbitrary waveform such as a rectangular wave shape or a triangular wave shape is generated, and the generated output voltage setting signal Ecr is output to the comparison circuit 711h.
- the comparison circuit 711h compares the voltage value signal Ed output from the voltage detection unit 711f with the output voltage setting signal Ecr output from the output voltage setting circuit 711b, and sends a difference signal Ev indicating the difference to the power supply circuit 711a. Output.
- the power supply circuit 711a includes an AC-DC converter for AC / DC conversion of commercial AC, an inverter circuit for converting the AC / DC converted DC into required AC, a rectifier circuit for rectifying the converted AC, and the like.
- the power supply circuit 711a performs PWM control of the inverter according to the difference signal Ev output from the comparison circuit 711h, and outputs a voltage to the welding wire 705.
- a periodically changing welding voltage Vw is applied between the base material 704 and the welding wire 705, and the welding current Iw is energized.
- the welding power source 701 is configured to receive an output instruction signal from the outside via a control communication line (not shown), and the power supply unit 711 uses the output instruction signal as a trigger to perform welding to the power supply circuit 711a. Supply of the current Iw is started.
- the output instruction signal is output from the welding robot to the welding power source 701, for example.
- the output instruction signal is output from the torch 702 side to the welding power source 701 when a hand operation switch provided on the torch 702 side is operated.
- the power supply unit 711 of the welding power supply 701 has a constant voltage characteristic.
- the power supply unit 711 has an external characteristic that a decrease in the welding voltage with respect to an increase in the welding current of 100 A is 4 V or more and 20 V or less.
- the perturbation of the melted portion 706 is suppressed, and it becomes easy to maintain the buried arc state.
- the value of the welding current is increased, the melting rate of the welding wire 705 is increased, and the arc length is increased.
- the value of the welding current decreases, the melting rate of the welding wire 705 decreases, and the arc length becomes shorter (arc length self-control action).
- the voltage drop is preferably 5 V or more.
- the voltage drop is preferably 15 V or less.
- FIG. 13 is a flowchart showing the procedure of the welding method according to the seventh embodiment
- FIG. 14 is a side sectional view showing a base material 704 to be welded.
- a pair of base materials 704 to be joined by welding are arranged in an arc welding apparatus, and various settings of the welding power source 701 are performed (step S711).
- plate-shaped first base material 741 and second base material 742 are prepared, end surfaces 741 a and 742 a which are welded portions are abutted, and arranged at a predetermined welding work position.
- the first base material 741 and the second base material 742 may be provided with a groove having an arbitrary shape such as a Y shape or a ret shape.
- the first and second base materials 7041 and 42 are steel plates such as mild steel, carbon steel for machine structure, alloy steel for machine structure, and the thickness is 9 mm or more and 30 mm or less. Then, the welding power source 701 sets the welding conditions for the welding current Iw within a frequency range of 10 Hz to 1000 Hz, an average current of 300 A or more, and a current amplitude of 50 A or more.
- all the welding current Iw condition settings may be made by the welding operator, or the welding power source 701 accepts the execution of the welding method according to the seventh embodiment at the operation unit and automatically sets all the condition settings. You may comprise so that it may carry out. Also, the welding power source 701 accepts some welding conditions such as average current at the operation unit, determines the remaining welding conditions that match the accepted some welding conditions, and performs the condition setting semi-automatically. It may be configured.
- the welding power source 701 determines whether or not the output start condition of the welding current Iw is satisfied (step S712). Specifically, the welding power source 701 determines whether or not a welding output instruction signal has been input. When it is determined that the output instruction signal is not input and the output start condition of the welding current Iw is not satisfied (step S712: NO), the welding power source 701 waits in an input instruction signal waiting state.
- the feeding speed control unit 712 of the welding power source 701 sends a feeding instruction signal for instructing the feeding of the wire to the wire feeding unit 703.
- the welding wire 705 is fed at a predetermined speed (step S713).
- the feeding speed of the welding wire 705 is set within a range of about 5 to 100 m / min, for example.
- the feeding speed control unit 712 determines the feeding speed according to the average current setting signal output from the average current setting circuit 711e.
- the feeding speed of the welding wire 705 may be a constant speed or may be periodically changed. Moreover, you may comprise so that a welding operator may set the feed speed of a wire directly.
- the power source unit 711 of the welding power source 701 detects the welding voltage Vw and the welding current Iw with the voltage detection unit 711f and the current detection unit 711g (step S714), and the detected welding current Iw frequency, current amplitude, and average.
- a target voltage is generated and PWM control is performed on the welding voltage so that the current matches the set welding conditions and the welding current Iw periodically varies (step S715).
- the welding power source 701 outputs the target voltage by periodically varying the target voltage so that the welding current Iw periodically varies at a frequency of 10 Hz to less than 1000 Hz, an average current of 300 A or more, and a current amplitude of 50 A or more. To control.
- the power supply unit 711 of the welding power source 701 determines whether or not to stop the output of the welding current Iw (step S716). Specifically, the welding power source 701 determines whether or not the input of the output instruction signal is continued. When the input of the output instruction signal is continued and it is determined that the output of the welding current Iw is not stopped (step S716: NO), the power supply unit 711 returns the process to step S713 and continues the output of the welding current Iw.
- step S716 When it determines with stopping the output of the welding current Iw (step S716: YES), the power supply part 711 returns a process to step S712.
- FIGS. 15A to 15C are graphs showing fluctuations in the welding voltage Vw and the welding current Iw
- FIG. 16 is a schematic diagram showing the welding method according to the seventh embodiment.
- the horizontal axis of each graph shown in FIGS. 15A to 15C represents time
- the vertical axis of each graph shown in FIGS. 15A to 15C represents the set voltage of the welding power source 701, the welding voltage between the base material 704 and the welding wire 705, respectively.
- Vw is the welding current Iw flowing through the arc 707.
- the power supply unit 711 controls the welding current Iw so that the frequency of the welding current Iw is 10 Hz to 1000 Hz, the average current is 300 A or more, and the current amplitude is 50 A or more.
- the welding power source 701 having constant voltage characteristics sets the target voltage so that the welding current Iw varies in this way, and periodically varies the target voltage. The same applies to the control of the welding current Iw below.
- the power supply unit 711 controls the welding current Iw so that the frequency of the welding current Iw is 50 Hz to 300 Hz, the average current is 300 A to 1000 A, and the current amplitude is 100 A to 500 A.
- the power source unit 711 has a welding current Iw such that the frequency of the welding power source 701 is 80 Hz to 200 Hz, the current amplitude is 200 A to 400 A, and the average current is 500 A to 800 A.
- the frequency of the welding current is about 100 Hz
- the current amplitude is about 240 A
- the average current is about 530 A.
- the diameter of the welding wire 705 is appropriately referred to as a wire diameter.
- the set voltage becomes a rectangular wave voltage having a frequency of 100 Hz and a voltage amplitude of 30 V, for example, as shown in FIG. 15A, and between the welding wire 705 and the base material 704.
- 15B is applied with a welding voltage Vw, and a welding current Iw as shown in FIG. 15C flows.
- the welding power source 701 controls the set voltage at a frequency of 100 Hz so that the current amplitude of the welding current Iw is 240A and the average current is 530A.
- the welding power source 701 controls the feeding of the welding wire 705 at a speed of about 40 m / min.
- the welding voltage Vw is fluctuate
- variation range of the welding voltage Vw changes with the influence of various impedances.
- the current waveform shown in FIG. 15C is an example, and is not particularly limited.
- the current waveform may be a substantially rectangular wave shape or a triangular wave shape.
- the first state is, for example, a state in which the droplet transfer form of the welding wire 705 is drop transfer.
- the second state is, for example, a state in which the droplet transfer form of the welding wire 705 is rotating.
- the drop transition is an example of a form in which a droplet moves from the tip 705 a of the welding wire 705 to the bottom 761 of the melting portion 706, and the rotating transition is from the tip 705 a of the welding wire 705 to the side 762 of the melting portion 706. It is an example of the form which transfers a droplet.
- the molten metal closes the buried space 706a and tends to flow in the direction in which the distal end portion 705a of the welding wire 705 is buried.
- the arc 707 jumps to the side portion 762 of the molten portion 706, and the molten portion 706
- the molten metal is pushed back in the direction away from the welding wire 705, and the buried space 706a is stabilized in a concave state.
- the tip 705a of the welding wire 705 is shortened as a result of the transfer of the droplets at the tip 705a of the welding wire 705 melted by a large current.
- the molten metal can be slightly vibrated at a higher frequency than a large waving cycle. And the undulation of the molten metal is suppressed.
- FIG. 17 is a chart showing experimental results related to stabilization of the buried space 706a and the bead shape
- FIG. 18 is a chart showing experimental results related to stabilization of the buried space 706a and the bead shape.
- the wire diameter is 1.4 mm
- the protruding length of the welding wire 705 is 18 mm
- the feeding speed of the welding wire 705 is 17.5 m / min
- the average welding current is 530 A
- the frequency and amplitude of the welding current are adjusted. It was changed and buried arc welding of thick plates was performed.
- 17 and 18 show the experimental results when the frequency of the welding current is 0 Hz and the amplitude is 0 A, that is, the appearance and shape of the bead when welding is performed without vibrating the welding current.
- 17 and 18 show the bead shape when welding is performed under the conditions of a welding current frequency of 10 Hz and an amplitude of 50 A, and the lower diagrams of FIGS. 17 and 18 show the welding current frequency of 50 Hz and the amplitude. Shows the appearance and shape of the bead when welding is performed under the condition of 100A.
- a good bead shape can be obtained by oscillating the welding current under a welding condition having a frequency of 10 Hz or more and a current amplitude of 50 A or more compared to the case of a frequency of 0 Hz.
- Such a good bead shape indicates that the buried space 706a is stabilized by vibrating the welding current at a frequency of 10 Hz, and the occurrence of a short circuit is suppressed.
- the molten metal is similarly suppressed to stabilize the buried space 706a from the operating principle of suppressing the molten metal.
- the undulation of the molten metal can be sufficiently suppressed with a current amplitude of 50 A, it is expected that the undulation of the molten metal can be suppressed even with a current amplitude of 50 A or more.
- the wire diameter, the protruding length of the welding wire 705, the feeding speed, and the average current are not particularly limited as long as a buried arc described below can be realized, and the frequency of the welding current is 10 Hz or more. If the current amplitude is 50 A, a good bead shape can be obtained in the same manner. In particular, if the frequency is 50 Hz and the current amplitude is 100 A or more, a better bead shape can be obtained.
- the welding conditions for realizing the buried arc will be described.
- the position of the tip portion 705a of the welding wire 705 is generally located above the base material 704, and an arc is generated between the tip portion 705a of the welding wire 705 and the base material 704 in this state.
- An arc generated in such a state is called a non-buried arc.
- the distance between the tip 705a of the welding wire 705 and the surface of the molten metal formed on the surface of the base material 704 is called the arc length. This arc length decreases as the welding voltage decreases. It is known to be shortened.
- a buried arc can be realized by generating an arc under a low voltage condition in a high current region where the arc pressure becomes strong.
- a welding current of 300 A or more is required (for example, Tomo Asai, “Increasing efficiency of factory welding-Case of heavy electrical equipment welding”, Japan Welding Association, Welding Information Center, WE-COM Magazine) No. 16, April 2015).
- the voltage value capable of realizing the buried arc varies depending on the welding current, the wire diameter, and the protruding length of the welding wire 705.
- the position of the tip portion 705a of the welding wire 705 is changed to the base material 704 or the molten metal. By setting the voltage low enough to be lowered to a position lower than the metal surface, a buried arc can be realized.
- FIG. 19 is a graph showing the welding current and voltage conditions for realizing a buried arc.
- the horizontal axis indicates the welding current, and the vertical axis indicates the welding voltage.
- the open area indicates the welding current and voltage that can achieve a buried arc.
- when the welding voltage is high with respect to the welding current normal arc welding, that is, non-buried arc welding is performed. Conversely, when the welding voltage is too low, the output is insufficient and it becomes difficult to maintain the arc. . In the middle region, there is a range that becomes a buried arc in which the arc 707 is generated in the buried space 706a.
- the range of welding conditions for realizing the buried arc is affected by the wire diameter and the protruding length of the welding wire 705 as described above.
- FIG. 20 is a conceptual diagram showing the relationship between the wire diameter and the wire protruding length, and the welding current and voltage conditions for realizing the buried arc.
- the range of welding current and voltage that can realize the buried arc is as shown by reference characters Arc3, Aec2, and Arc1. Shifting to the lower voltage region side for the same current in order.
- FIG. 21 is a graph showing an example of welding current and voltage conditions for realizing a buried arc when the wire diameter is 1.6 mm and the welding wire 705 has a protruding length of 25 mm.
- the horizontal axis represents the welding current
- the vertical axis represents the welding voltage.
- the black circle plot shows the boundary between the non-buried arc and the buried arc.
- the black circle plot on the upper polygonal line becomes a non-buried arc when the welding voltage is increased in the welding current indicated by the black circle plot, and becomes a buried arc when the welding voltage is decreased.
- the black circle plot on the lower polygonal line becomes a buried arc when the welding voltage is increased in the welding current indicated by the black circle plot, and becomes a non-buried arc when the welding voltage is decreased.
- the welding voltage is high with respect to the welding current, normal arc welding, that is, non-buried arc welding is performed, and conversely, when the welding voltage is too low, the output is insufficient and it is difficult to maintain the arc.
- the middle region there is a range that becomes a buried arc in which the arc 707 is generated in the buried space 706a.
- the welding current that realizes the buried arc is 300 A or more, and when the tip portion 705a of the welding wire 705 approaches the molten metal, an electric current that can generate an arc pressure that pushes the molten metal away. Value.
- the welding voltage that realizes the buried arc is a voltage value that can lower the position of the tip 705a of the welding wire 705 to a position lower than the base material 704 or the molten metal surface.
- the specific welding current and voltage may be determined as appropriate in consideration of the tendency shown in FIGS. 19 and 20 with reference to the range of the welding current and voltage shown in FIG.
- ⁇ Welding conditions that can stabilize buried space and suppress undulation of molten metal Other suitable welding conditions that can stabilize the buried space 706a and suppress the undulation of the molten metal will be described.
- Such suitable welding conditions are, for example, a frequency of welding current of 20 Hz to 600 Hz, an amplitude of 50 A to 500 A, and an average current of 300 A to 1000 A. Further, the frequency of the welding current may be 40 Hz to 380 Hz, the amplitude may be 100 A to 500 A, and the average current may be 300 A to 1000 A.
- the frequency of the welding current may be 60 Hz or more and 280 Hz or less, the amplitude may be 100 A or more and 500 A or less, and the average current may be 300 A or more and 900 A or less. Furthermore, the frequency of the welding current may be 60 Hz to 180 Hz, the amplitude may be 150 A to 500 A, and the average current may be 300 A to 800 A.
- the welding current Iw is periodically changed even when gas shield arc welding is performed using a large current of 300 A or more.
- the undulation of the molten metal can be suppressed, and the occurrence of bead disturbance and sagging can be prevented.
- the self-control action of the arc length cannot be obtained, it is necessary to perform some control for assuring a constant arc length. Since the arc welding apparatus according to the seventh embodiment has constant voltage characteristics and an arc length self-control action is obtained, the arc length is kept constant, and the undulation of molten metal can be more effectively suppressed.
- the case where the period during which the welding current Iw and the welding voltage Vw are large and the period during which the welding voltage Vw is small is substantially the same, but the ratio of each period may be changed.
- the ratio of the period it is possible to adjust the width of the vertical position fluctuation of the tip end portion 705a of the welding wire 705 while suppressing the undulation of the molten metal.
- the ratio at which the tip portion 705a of the welding wire 705 is held at a position higher than the bottom portion 761 of the molten portion 706 increases.
- the amount of heat input to the base material 704 can be increased and the bead moldability can be improved.
- FIG. 22 is a chart showing each droplet transfer mode of drop transfer, pendulum transfer, and rotating transfer.
- the left column shows welding conditions
- the right column shows a plurality of different droplet transfer forms.
- the middle row shows a schematic diagram showing an image obtained by photographing the molten portion 706 in each droplet transfer form every 0.4 msec using a high-speed camera.
- the plurality of droplet transfer modes include, for example, three types of droplet transfer modes shown in FIG. 22, that is, drop transfer, pendulum transfer, and rotating transfer. Drop transfer and rotating transfer are general names, but pendulum transfer is coined by the inventor.
- droplet transfer modes are comprehensively affected by various factors including welding current, wire protrusion length, welding wire 705 diameter, welding wire 705 material, welding wire 705 feed speed, and the like. Although determined, it is particularly strongly influenced by the welding current.
- the wire protrusion length is the distance between the tip of the contact chip and the base material 704. When the welding current is relatively small, a drop transition is exhibited, and the droplet transfer form transitions to a pendulum transition and a rotation transition as the welding current increases.
- the drop transition is a droplet transition form in which the tip portion 705a of the welding wire 705 is melted and the droplet is separated from the welding wire 705 in a granular form, and an arc is generated between the tip portion 705a of the welding wire 705 and the bottom portion 761 of the melting portion 706. 707 occurs. That is, in the drop transition, the arc 707 is directed downward, that is, the extending direction of the welding wire 705.
- the liquid column and the arc 707 formed on the distal end portion 705a of the welding wire 705 are swung in a pendulum shape on the same plane, and the entire plane is a little as a whole with the protruding direction of the welding wire 705 as a central axis. It is a characteristic droplet transfer form that rotates one by one. In the rotation transition, an arc 707 is generated between the distal end portion 705a of the welding wire 705 and the side portion 762 of the melting portion 706, and the liquid column and the arc 707 formed on the distal end portion 705a of the welding wire 705 have a concave melting portion 706. This is a droplet transfer form that continues to rotate while facing the direction of the side portion 762.
- welding current and droplet transfer mode under the condition that the wire protrusion length is 25 mm, the diameter of the welding wire 705 is 1.2 mm, the material of the welding wire 705 is YGW12, and the feeding speed of the welding wire 705 is 30 cm / min.
- the relationship is shown in FIG.
- FIG. 23 is a conceptual diagram showing the relationship between the welding current when the wire diameter is 1.2 mm and the wire protrusion length is 25 mm and the droplet transfer mode of the welding wire 705.
- the thick line arrows indicate the welding current
- the thin line arrows indicate the range of the welding current in each droplet transfer form. Note that the relationship between the welding current and the droplet transfer form shown in FIG. 23 is only an example under the conditions such as the above-described wire diameter and wire protrusion length.
- the droplet transfer form of drop transfer becomes dominant.
- the droplet transfer forms of drop transfer and pendulum transfer are mixed.
- the welding transition mode of pendulum transition becomes dominant.
- the welding current is in the current range of 600 A or more and less than 700 A
- the welding transition forms of pendulum transition and rotating transition are mixed.
- the welding current is in a current region of 700 A or more
- the droplet transfer form of the rotating transfer becomes dominant.
- a buried space 706a that is, a space surrounded by a concave molten portion 706 is formed in the molten metal, but the molten metal always closes the buried space 706a and the tip 705a of the welding wire 705 is closed. Tries to flow in the direction in which it is buried. However, the melting portion 706 is supported by the force of the arc irradiated from the tip portion 705a of the welding wire 705 to the side portion 762 of the melting portion 706, and the buried space 706a is held in a stable state.
- the opening of the buried space 706a is narrowed and finally comes into contact with the welding wire 705 to cause a short circuit.
- the welding state becomes extremely unstable.
- the arc 707 cannot sufficiently support the side portion 762 of the molten portion 706, and the short circuit may cause welding to become unstable.
- the arc 707 is irradiated to the side portion 762 of the concave melted portion 706, and the buried space 706a can be stabilized by supporting the opening of the buried space 706a.
- the arc 707 is irradiated to the side portion 762 of the melted portion 706 at a constant interval even when the pendulum moves, a similar effect of stabilizing the buried space 706a can be obtained as in the case of the rotating transition.
- the arc 707 is directed downward, that is, the bottom portion 761 of the melted portion 706 is irradiated, and thus the stabilization effect described above cannot be obtained.
- the buried space 706a can be stabilized, but since the arc 707 is not irradiated to the bottom 761 of the buried space 706a, the penetration of the base material 704 with respect to the output of the welding current tends to be relatively shallow. is there.
- the penetration per unit output of the welding current becomes relatively deep.
- the arc 707 is irradiated to the bottom 761 of the melted portion 706 at regular intervals, so that a relatively deep penetration can be obtained as in the drop transfer.
- the drop transition and the rotating transition exhibit regular droplet transition, but it is impossible to achieve both stabilization of the buried space 706a and deep penetration. Further, in the pendulum transfer, it is considered that stabilization of the buried space 706a and deep penetration can be achieved at the same time.
- the liquid column and the arc 707 behave irregularly, it is not always possible to realize stable welding. . That is, even if any one of the three solution transfer modes is used, it is impossible to realize both stabilization of the buried space 706a and deep penetration only by a single droplet transfer mode. Further, as described above, since the droplet transfer mode changes depending on the current region of the welding current, it is difficult to use only a specific droplet transfer mode for general purposes.
- these three droplet transfer modes are used in combination to achieve both stabilization of the buried space 706a and deep penetration.
- the welding current Iw in the small current period is set as a current region exhibiting a drop transition
- the welding current Iw in the large current period is represented as a current region exhibiting a pendulum transition or a rotating transition.
- the welding current Iw in the small current period is described as the current region of the drop transition and the welding current Iw in the large current period is described as the current region of the pendulum transition or the rotating transition, the welding current Iw in the small current period and the large current period is described.
- the current region is not limited to this. Specifically, at least one of a current region of 300A to less than 450A, a current region of 450A to less than 550A, a current region of 550A to less than 600A, a current region of 600A to less than 700A, and a current region of 700A or more.
- the welding current may be periodically varied so that the arc 707 is irradiated to the bottom 761 and the side 762 of the melted portion 706 by periodically varying between the two current regions.
- the fluctuation period of the welding current may be set in the range of 10 Hz to 1000 Hz, preferably in the range of 50 Hz to 300 Hz.
- the diameter of the welding wire 705 is preferably set to 0.9 mm or more and 1.6 mm or less, and the feeding speed of the welding wire 705 is preferably set to 30 m / min or more.
- the feeding speed of the welding wire 705 may be a constant feeding speed such as 30 m / min, 50 m / min, 60 m / min, or may be varied according to the magnitude of the welding current.
- the arc welding apparatus periodically varies the welding current so that the welding current Iw in the small current period is in a current region of 300 A or more and less than 450 A, and the welding current Iw in the large current period is in a current region of 550 A or more and less than 600 A. Good to do.
- the droplet transfer mode of drop transfer and pendulum transfer is periodically switched, and a first state in which an arc 707 is generated between the tip portion 705a of the welding wire 705 and the bottom portion 761 of the melted portion 706, and the tip portion 705a and A second state in which the arc 707 is generated between the side portions 762 of the melted portion 706 is periodically repeated.
- the arc welding apparatus periodically varies the welding current so that the welding current Iw in the small current period is in a current region of 300 A or more and less than 450 A and the welding current Iw in the large current period is in a current region of 700 A or more. good.
- the droplet transfer mode of drop transfer and rotating transfer is periodically switched, and the first state where the arc 707 is generated between the tip portion 705a of the welding wire 705 and the bottom portion 761 of the molten portion 706, and the tip portion 705a.
- the second state in which the arc 707 is generated between the side portions 762 of the molten portion 706 is periodically repeated.
- the arc welding apparatus periodically varies the welding current so that the welding current Iw in the small current period is in a current region of 550 A or more and less than 600 A and the welding current Iw in the large current period is in a current region of 700 A or more. good.
- the droplet transfer mode of the pendulum transfer and the rotating transfer is periodically switched, and the first state in which the arc 707 is generated between the tip portion 705a of the welding wire 705 and the bottom portion 761 of the molten portion 706, and the tip portion 705a.
- the second state in which the arc 707 is generated between the side portions 762 of the molten portion 706 is periodically repeated.
- the welding current may be periodically changed using a current region in which two droplet transfer modes are mixed.
- the arc welding apparatus periodically varies the welding current so that the welding current Iw in the small current period is 450 A or more and less than 550 A, and the welding current Iw in the large current period is 700 A or more. Also good.
- the state where the drop transition and the pendulum transition are mixed and the rotating transition are periodically switched.
- the arc welding apparatus periodically varies the welding current so that the welding current Iw in the small current period is in a current region of 300 A or more and less than 450 A and the welding current Iw in the large current period is in a current region of 600 A or more and less than 700 A. You may let them.
- the drop transition and the state where the pendulum transition and the rotating transition are mixed are periodically switched.
- the above-mentioned welding conditions are only examples, and the welding current range of the welding wire 705 is not limited to the above numerical range for the material of the welding wire 705, the wire system, the protruding length, and the feeding speed of the welding wire 705. .
- various conditions that enable mutual transition of droplet transfer modes of drop transfer, pendulum transfer, and rotating transfer in a buried arc will be described.
- the material of the welding wire 705 may be a solid wire such as YGW11, YGW15, YGW17, YGW18, YGW19, etc. in addition to YGW12.
- a flux cored wire, a metal cored wire, and other novel wires may be applied as the welding wire 705.
- the protruding length of the welding wire 705 is preferably 10 mm or more and 35 mm or less. Since the penetration becomes shallower as the protruding length becomes longer, it is better to keep it at 35 mm at the longest. On the other hand, when the protruding length is shortened, the tip end approaches the molten pool, and the tip wear becomes intense. This tendency is particularly noticeable because of high current welding, and frequent tip replacement is required when the thickness is less than 10 mm. Furthermore, the protruding length of the welding wire 705 affects the transition current in the transition form (see FIG. 24). From the viewpoint of balance, an appropriate range exists for the protruding length, and about 10 to 35 mm is appropriate.
- the wire diameter is preferably 0.9 mm or more and 1.6 mm or less, for example.
- the wire diameter can be basically adapted to any wire diameter by appropriately changing the welding conditions, and is not particularly limited. About 1.6 mm is practical. Further, the wire diameter affects the transition current in the droplet transfer form (see FIG. 24). Also from this point of view, when an extremely thick welding wire 705 or a thin welding wire 705 is used, the transition region of the droplet transfer form widens greatly, making it difficult to use any droplet transfer form. Therefore, about 0.9 to 1.6 mm is appropriate.
- the feeding speed of the welding wire 705 correlates with the welding current, it may be determined as appropriate so that the buried space 706a is formed according to the welding current.
- FIG. 24 is a conceptual diagram showing the relationship between the wire diameter and the wire protrusion length and the droplet transfer form of the welding wire 705.
- the horizontal axis indicates the welding current
- the vertical axis indicates the length of the protruding length of the welding wire 705 and the size of the wire system.
- the transition current in the form of droplet transfer is strongly influenced by the wire diameter and protrusion length.
- FIG. 24 shows the influence of the protruding length of the welding wire 705 and the wire diameter on the transition current in the droplet transfer form. As shown in FIG. 24, as the wire diameter is larger or the protruding length is shorter, the transition current is shifted to the high current region side as a whole. This is due to the difference in resistance heat generation of the welding wire 705.
- FIG. 25 is a conceptual diagram showing the relationship between the welding current when the wire diameter is 1.4 mm and the wire protrusion length is 25 mm and the droplet transfer form of the welding wire 705.
- FIG. 25 is similar to FIG. 22 in that welding is performed under the conditions that the wire protruding length is 25 mm, the diameter of the welding wire 705 is 1.4 mm, the material of the welding wire 705 is YGW12, and the feeding speed of the welding wire 705 is 30 cm / min.
- the wire diameter and the protruding length of the welding wire 705 can be appropriately determined in consideration of the tendency shown in FIG. 24 with reference to FIG. 23 or FIG.
- the welding power source 701 that performs the above welding method sets the welding current, the frequency of the welding current, and the feeding speed of the welding wire 705 described in the above welding method. Note that the welding power source 701 may receive and store the welding conditions at the operation unit, or may store them in advance. The welding power source 701 controls the feeding of the welding wire 705 based on the set welding conditions, and periodically varies the welding current.
- the welding method and arc welding apparatus when the welding current is varied under the above conditions, drop transition, pendulum transition, rotating transition, and these two are mixed. It fluctuates periodically between the two states, the undulation of the molten metal can be suppressed, and the stabilization and deep penetration of the buried space 706a can be realized.
- the arc 707 is not necessarily applied to the side portion 762 of the melted portion 706 during a high current period.
- the droplet transition form transitions transiently.For example, even in the current region where the pendulum transition or rotating transition occurs in the original steady state, that is, during the large current period, it is not always necessary.
- the droplet transfer mode does not shift to the pendulum transfer or the rotation transfer, and then exhibits the pendulum transfer or the rotation transfer with a slight delay after the small current period.
- a drop transition may be exhibited, or the arc 707 may be irradiated to the bottom 761 of the melted portion 706.
- the small current period does not necessarily have to be a current region that constantly exhibits a drop transition
- the large current period does not necessarily have to be a current region that constantly exhibits a pendulum transition or a rotating transition. Since the transition of the droplet transfer form is transitional, there may be a case where the droplet transfer form is different temporarily or transiently even if it is not in the current region that constantly exhibits the corresponding droplet transfer form.
- the large current period and the small current period need not be in a state where the welding current is maintained at a constant current value, and the current waveform of the periodically varying welding current is limited to a specific waveform such as a rectangular wave. It is not something.
- the current waveform of the welding current may be a triangular wave.
- the large current period is a period when the welding current is large on average
- the small current period is a period when the welding current is small on average.
- the example in which the droplet transfer mode is changed by periodically changing the current region of the welding current has been described.
- the transition of the droplet transfer mode is caused by the change in the welding current.
- the force of the arc 707 periodically fluctuates between a large current period and a small current period, and a constant minute and relatively large frequency vibration is applied to the melted portion 706. Accordingly, since a large peristalsis of the buried space 706a that occurs at a relatively low frequency or suddenly is suppressed, this alone has a certain effect on the stabilization of the buried space 706a. Accordingly, the present invention can stabilize the buried space 706a to some extent without necessarily involving the transition of the droplet transfer mode.
- the welding method of the present invention can be applied particularly advantageously to welding that requires improvement in work efficiency.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
Description
また、埋もれアーク溶接における溶融金属は、大きく波打つおそれがあるが、前記周波数、平均電流及び電流振幅にて溶接電流を周期的に変動させることにより、大きな波打ち周期よりも高周波数で溶融金属を微振動させ、溶融金属の大きな波打ちを抑えることができ、厚板の1パス溶接を実現することができる。
また、埋もれアーク溶接における溶融金属は、大きく波打つおそれがあるが、溶接電流を周期的に変動させることにより、凹状の溶融部分の底部にアークが飛ぶ第1状態と、溶融部分の側部にアークが飛ぶ第2状態とを周期的に変動させることができ、溶融金属の波打ちを抑えることができ、厚板の1パス溶接を実現することができる。
まず、実施の形態1における溶接方法について説明する。図1を参照して、実施の形態1の溶接方法においては、まず工程(S10)として母材準備工程が実施される。この工程(S10)では、溶接により接合されるべき一対の母材が準備される。具体的には、図2を参照して、第1母材50および第2母材60が準備される。第1母材50および第2母材60は、たとえば軟鋼、機械構造用炭素鋼、機械構造用合金鋼などの鋼からなる鋼板である。鋼板の厚みは、たとえば9mm以上30mm以下である。
なお、溶接条件によっては、溶接ワイヤ15の送給速度を5~100m/分の範囲内で設定することも可能である。
次に、本発明の他の実施の形態である実施の形態2における溶接方法について説明する。実施の形態2の溶接方法は、基本的には上記実施の形態1の場合と同様に実施され、同様の効果を奏する。しかし、実施の形態2の溶接方法は、母材の端面の形状において実施の形態1の場合とは異なっている。
(実施例)
次に、本発明の他の実施の形態である実施の形態3における溶接方法について説明する。実施の形態3の溶接方法は、基本的には上記実施の形態1の場合と同様に実施され、同様の効果を奏する。しかし、実施の形態3の溶接方法は、溶接工程が実施の形態1の場合とは異なっている。
実施の形態3の溶接方法においては、図1に示す実施の形態1と同様の手順で母材準備工程(S10)、母材配置工程(S20)、溶接工程(S30)が実施される。
図6Aは、実施の形態3における溶接工程の、溶接ワイヤ15が深く侵入した状態を示す概略図、図6Bは、実施の形態3における溶接工程の、溶接ワイヤが浅く侵入し、溶滴の移行形態がローテーティング移行である状態を示す概略図、図7は、電流、電圧および溶接ワイヤの送給速度の制御状態を示すタイミングチャートである。
次に、本発明の他の実施の形態である実施の形態4における溶接方法について説明する。実施の形態4の溶接方法は、基本的には上記実施の形態3の場合と同様に実施され、同様の効果を奏する。しかし、実施の形態4の溶接方法は、母材の端面の形状において実施の形態3の場合とは異なっている。
図4を参照して、実施の形態4における溶接方法においては、工程(S10)において、開先70が形成された第1母材50および第2母材60が準備される。開先70は、第1母材50および第2母材60の一方の主表面52,62側に形成される。開先70は、第1端面51と一方の主表面52とが接続される第1母材50の角部、および第2端面61と一方の主表面62とが接続される第2母材60の角部を除去するように形成される。そのため、工程(S20)において、第1端面51と第2端面61とが対向するように第1母材50および第2母材60が配置されると、開先70に対応する領域において、一方の主表面52,62に近づくにしたがって第1母材50と第2母材60との間隔が広がる。
(実施例)
次に、本発明の他の実施の形態である実施の形態5における溶接方法について説明する。実施の形態5の溶接方法は、基本的には上記実施の形態1の場合と同様に実施され、同様の効果を奏する。しかし、実施の形態5の溶接方法は、溶接工程が実施の形態1の場合とは異なっている。
実施の形態5の溶接方法においては、図1に示す実施の形態1と同様の手順で母材準備工程(S10)、母材配置工程(S20)、溶接工程(S30)が実施される。
図9Aは、実施の形態5における溶接工程の、埋もれアーク状態を示す概略図、図9Bは、実施の形態1における溶接工程の、埋もれアークが解消した状態を示す概略図、図10は、溶接ワイヤ15の送給速度、電流および電圧の制御状態を示すタイミングチャートである。
次に、本発明の他の実施の形態である実施の形態6における溶接方法について説明する。実施の形態6の溶接方法は、基本的には上記実施の形態5の場合と同様に実施され、同様の効果を奏する。しかし、実施の形態6の溶接方法は、母材の端面の形状において実施の形態5の場合とは異なっている。
図4を参照して、実施の形態6における溶接方法においては、工程(S10)において、開先70が形成された第1母材50および第2母材60が準備される。開先70は、第1母材50および第2母材60の一方の主表面52,62側に形成される。開先70は、第1端面51と一方の主表面52とが接続される第1母材50の角部、および第2端面61と一方の主表面62とが接続される第2母材60の角部を除去するように形成される。そのため、工程(S20)において、第1端面51と第2端面61とが対向するように第1母材50および第2母材60が配置されると、開先70に対応する領域において、一方の主表面52,62に近づくにしたがって第1母材50と第2母材60との間隔が広がる。
図12は、本実施の形態7に係るアーク溶接装置の一構成を示す模式図である。本実施の形態7に係るアーク溶接装置は、板厚が9~30mmの母材704を1パスで突き合わせ溶接することが可能な消耗電極式のガスシールドアーク溶接機であり、溶接電源701、トーチ702及びワイヤ送給部703を備える。
上記溶接電圧の低下が4V未満の場合、外乱要因によるアーク長の変動に対して溶接電圧の変動が小さく、溶接電流が大きく変動する。その結果、溶融部分706が大きく搖動して、埋もれアークの状態を維持することが難しくなる。上記溶接電圧の低下を4V以上とすることにより、溶融部分706の搖動が抑制され、埋もれアーク状態を維持することが容易となる。
また、外乱要因によってアーク長が短くなった場合、溶接電流の値が増加して溶接ワイヤ705の溶融速度が増大し、アーク長が長くなる。一方、外乱要因によってアーク長が長くなった場合、溶接電流の値が減少して溶接ワイヤ705の溶融速度が低下し、アーク長が短くなる(アーク長の自己制御作用)。上記溶接電圧の低下が20Vを超える場合、外乱要因によるアーク長の変動に対して溶接電流の変動が小さいため、上記アーク長の自己制御作用が小さくなる。その結果、埋もれアークの状態を維持することが難しくなる。上記溶接電圧の低下を20V以下とすることにより、上記アーク長の自己制御作用が維持され、埋もれアーク状態を維持することが容易となる。
なお、上記電圧低下は5V以上とすることが好ましい。また、上記電圧低下は15V以下とすることが好ましい。
そして、溶接電源701は、周波数10Hz以上1000Hz以下、平均電流300A以上、電流振幅50A以上の範囲内で溶接電流Iwの溶接条件を設定する。
好ましくは、電源部711は、溶接電流Iwの周波数が50Hz以上300Hz以下、平均電流が300A以上1000A以下、電流振幅が100A以上500A以下になるように、溶接電流Iwを制御する。
このような第1状態及び第2状態を10Hz以上、好ましくは50Hz以上300Hz以下、より好ましくは80Hz以上200Hz以下で変動させることによって、大きな波打ち周期よりも高周波数で溶融金属を微振動させることができ、溶融金属の波打ちが抑えられる。
図17及び図18の上図は、溶接電流の周波数が0Hz、振幅が0Aのときの実験結果、つまり溶接電流を振動させずに溶接を行ったときのビードの外観及び形状を示している。図17及び図18の中図は、溶接電流の周波数が10Hz、振幅が50Aの条件で溶接を行ったときのビード形状を示し、図17及び図18下図は、溶接電流の周波数が50Hz、振幅が100Aの条件で溶接を行ったときのビードの外観及び形状を示している。
また、溶融金属を高周波で振動させることによって、溶融金属の波打ちを抑える動作原理より、溶接電流の周波数が10Hz以上であっても、同様にして溶融金属の波打ちを抑え、埋もれ空間706aを安定化させることができると予想される。また、50Aの電流振幅で溶融金属の波打ちを十分に抑えることができることから、50A以上の電流振幅であっても、溶融金属の波打を抑えることができることが予想される。実際、溶融電流の周波数50Hz、溶接電流100A以上の溶接条件で溶接を行うと、図17及び図18に示すように、より良好なビード形状が得られた。なお、ワイヤ径、溶接ワイヤ705の突出し長さ、送給速度、平均電流は、以下に説明する埋もれアークを実現できる範囲であれば、特に限定されるものでは無く、溶接電流の周波数が10Hz以上及び電流振幅が50Aの条件であれば、同様にして良好なビード形状が得られる。特に、周波数50Hz及び電流振幅100A以上であれば、より良好なビード形状が得られる。
以下、埋もれアークを実現する溶接条件について説明する。
アーク溶接では一般的に、溶接ワイヤ705の先端部705aの位置は母材704より上側に位置し、その状態で溶接ワイヤ705の先端部705aと母材704の間にアークが発生する。かかる状態で発生したアークを、非埋もれアークと呼ぶ。非埋もれアークにおいては、溶接ワイヤ705の先端部705aと、母材704の表面に形成された溶融金属表面との間の距離をアーク長と呼ぶが、このアーク長は溶接電圧が低くなるにしたがって短くなることが知られている。通常のアーク溶接では、溶接電圧を下げてアーク長が短くなると、溶融金属と溶接ワイヤ705の先端部705aの位置の距離が近くなり、最終的にはアーク長が0となって溶接ワイヤ705と母材704とが短絡を起こし、アークの維持が困難となる。
具体的な溶接電流及び電圧は、図21に示す溶接電流及び電圧の範囲を基準としつつ、図19及び図20に示す傾向を考慮して溶接電流及び電圧を適宜決定すれば良い。
埋もれ空間706aを安定化させると共に、溶融金属の波打を抑えることができるその他の好適な溶接条件を説明する。
かかる好適な溶接条件は、例えば、溶接電流の周波数が20Hz以上600Hz以下、振幅が50A以上500A以下、平均電流が300A以上1000A以下である。
また、溶接電流の周波数が40Hz以上380Hz以下、振幅が100A以上500A以下、平均電流が300A以上1000A以下であっても良い。
更に、溶接電流の周波数が60Hz以上280Hz以下、振幅が100A以上500A以下、平均電流が300A以上900A以下であっても良い。
更にまた、溶接電流の周波数が60Hz以上180Hz以下、振幅が150A以上500A以下、平均電流が300A以上800A以下であっても良い。
また、溶融金属の波打ちをより効果的に抑えるためには、アーク長を一定に保つ必要がある。一般的な定電流パルス溶接の場合はアーク長の自己制御作用が得られないため、一定のアーク長を保証するための何らかの制御を行う必要がある。本実施の形態7に係るアーク溶接装置は定電圧特性であり、アーク長の自己制御作用が得られるため、アーク長が一定に保たれ、溶融金属の波打ちをより効果的に抑えることができる。
実施の形態8に係る溶接方法及びアーク溶接装置は、溶接電流Iw等の溶接条件が実施の形態7と異なるため、以下では主にかかる相違点について説明する。その他の構成及び作用効果は実施の形態7と同様であるため、対応する箇所には同様の符号を付して詳細な説明を省略する。
図22は、ドロップ移行、振り子移行、ローテーティング移行の各溶滴移行形態を示す図表である。図22中、左列は溶接条件、右欄は複数の異なる溶滴移行形態を示している。中央列は、高速度カメラを用いて、各溶滴移行形態にある溶融部分706を0.4m秒毎に撮影して得られた画像を示す模式図を示している。埋もれアーク溶接においては、複数の溶滴移行形態が存在する。複数の溶滴移行形態には、例えば図22に示す3種類の溶滴移行形態、即ちドロップ移行、振り子移行、ローテーティング移行が含まれる。なお、ドロップ移行及びローテーティング移行は一般名称であるが、振り子移行は発明者による造語である。
振り子移行は、溶接ワイヤ705の先端部705aに形成された液柱及びアーク707が、同一平面上を振り子状に揺動しつつ、溶接ワイヤ705の突き出し方向を中心軸として当該平面が全体として少しずつ回転していく特徴的な溶滴移行形態である。
ローテーティング移行は、溶接ワイヤ705の先端部705a及び溶融部分706の側部762間にアーク707が発生し、溶接ワイヤ705の先端部705aに形成された液柱及びアーク707が凹状の溶融部分706の側部762方向を向きながら回転を続ける溶滴移行形態である。
溶接電流が300A以上450A未満の電流域の場合、ドロップ移行の溶滴移行形態が支配的となる。
溶接電流が450A以上550A未満の電流域の場合、ドロップ移行及び振り子移行の溶滴移行形態が混在した状態となる。
溶接電流が550A以上600A未満の電流域の場合、振り子移行の溶接移行形態が支配的となる。
溶接電流が600A以上700A未満の電流域の場合、振り子移行及びローテーティング移行の溶接移行形態が混在した状態となる。
溶接電流が700A以上の電流域の場合、ローテーティング移行の溶滴移行形態が支配的となる。
これに対し、ローテーティング移行では、凹状の溶融部分706の側部762にアーク707が照射され、埋もれ空間706aの開口部を支えて埋もれ空間706aを安定化することができる。
また、振り子移行でも一定間隔でアーク707が溶融部分706の側部762に照射されるため、ローテーティング移行と同様、埋もれ空間706aを安定化させる類似の効果が得られる。ドロップ移行ではアーク707は下向き、つまり溶融部分706の底部761に照射されるため、上記の安定化効果は得られない。
一方、ローテーティング移行では埋もれ空間706aを安定化することができるものの、アーク707が埋もれ空間706aの底部761に照射されないため、溶接電流の出力に対する母材704の溶込みが比較的浅くなる傾向にある。これに対してドロップ移行においては、アーク707が溶融部分706の底部761に照射されるため、溶接電流の単位出力あたりの溶込みは比較的深くなる。振り子移行でも一定間隔で溶融部分706の底部761にアーク707が照射されるため、ドロップ移行と同様、比較的深い溶け込みが得られる。
すなわち、3つの溶液移行形態のいずれを用いても、単独の溶滴移行形態のみでは、埋もれ空間706aの安定化と深い溶込みの両立を実現することはできない。また、前述のように溶滴移行形態は溶接電流の電流域によって変化するため、特定の溶滴移行形態のみを汎用的に利用するのは困難である。
具体的には、300A以上450A未満の電流域、450A以上550A未満の電流域、550A以上600A未満の電流域、600A以上700A未満の電流域、及び700A以上の電流域の内、少なくともいずれか二つの電流域間で周期的に変動させ、アーク707が溶融部分706の底部761及び側部762に照射されるように、溶接電流を周期的に変動させると良い。溶接電流の変動周期は10Hz以上1000Hz以下の範囲、好ましくは50Hz以上300Hz以下の範囲で設定すると良い。溶接ワイヤ705の直径は0.9mm以上1.6mm以下、溶接ワイヤ705の送給速度は30m/分以上に設定すると良い。溶接ワイヤ705の送給速度は30m/分、50m/分、60m/分等、一定の送給速度であっても良いし、溶接電流の大きさに応じて、変動させても良い。
例えば、アーク溶接装置は、小電流期間における溶接電流Iwが450A以上550A未満の電流域、大電流期間における溶接電流Iwが700A以上の電流域となるように、溶接電流を周期的に変動させても良い。この場合、ドロップ移行及び振り子移行が混在した状態と、ローテーティング移行とが周期的に切り替えられる。
また、アーク溶接装置は、小電流期間における溶接電流Iwが300A以上450A未満の電流域、大電流期間における溶接電流Iwが600A以上700A未満の電流域となるように、溶接電流を周期的に変動させても良い。この場合、ドロップ移行と、振り子移行及びローテーティング移行が混在した状態とが周期的に切り替えられる。
更に、溶接ワイヤ705の突出し長さは移行形態の遷移電流に影響する(図24参照)。そのバランスの観点からも、突出し長さには適正範囲が存在し、10~35mm程度が適正である。
図25は、ワイヤ径が1.4mm、ワイヤ突き出し長さが25mmのときの溶接電流と、溶接ワイヤ705の溶滴移行形態との関係を示す概念図である。図25は、図22と同様、ワイヤ突出し長さが25mm、溶接ワイヤ705の直径が1.4mm、溶接ワイヤ705の材質がYGW12、溶接ワイヤ705の送給速度が30cm/分の条件における、溶接電流と溶滴移行形態との関係を示したものであり、溶接条件はワイヤ径のみが異なる。ワイヤ径が1.2mmの場合と、1.4mmの場合を比較すると、図22及び図25に示すように、溶滴移行形態の遷移電流は全体的に高電流側へ遷移する。
同様に、大電流期間であっても、ドロップ移行を呈し、又はアーク707が溶融部分706の底部761に照射される場合がある。
なお、上記実施形態1~8の少なくとも一部を任意に組み合わせてもよい。また、実施形態1~6に記載の溶接方法を、実施形態7で説明した溶接装置にて実施しても良い。
12 溶融領域
15 溶接ワイヤ
15A 先端
17 コンタクトチップ
18 ノズル
19 トーチ
29 ワイヤ送給装置
30 電源
34 配線
50 第1母材
51 第1端面
52,53 主表面
60 第2母材
61 第2端面
62,63 主表面
64 配線
70 開先
100 溶接装置
701 溶接電源
702 トーチ
703 ワイヤ送給部
704 母材
705 溶接ワイヤ
705a 先端部
706 溶融部分
706a 埋もれ空間
7061 底部
762 側部
707 アーク
711 電源部
711a 電源回路
711b 出力電圧設定回路
711c 周波数設定回路
711d 電流振幅設定回路
711e 平均電流設定回路
711f 電圧検出部
711g 電流検出部
711h 比較回路
712 送給速度制御部
741 第1母材
742 第2母材
Vw 溶接電圧
Iw 溶接電流
Ecr 出力電圧設定信号
Ed 電圧値信号
Id 電流値信号
Ev 差分信号
Claims (24)
-
第1母材および第2母材を準備する工程と、
前記第1母材の第1端面と前記第2母材の第2端面とが対向するように、前記第1母材および前記第2母材を配置する工程と、
前記第1端面と前記第2端面とが接合されるように前記第1母材と前記第2母材とをGMA溶接により溶接する工程と、を備え、
前記第1母材と前記第2母材とを溶接する工程では、溶接ワイヤと前記第1母材および前記第2母材との間にアークが形成され、前記アークの熱により前記第1母材および前記第2母材に溶融領域が形成されることで前記第1母材と前記第2母材とが溶接され、
前記第1母材と前記第2母材とを溶接する工程では、前記溶接ワイヤが前記溶融領域に取り囲まれる領域にまで侵入した状態で前記アークが形成されることで、前記溶融領域が前記第1母材および前記第2母材を厚み方向に貫通するように形成される溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程では、前記溶接ワイヤが前記溶融領域に取り囲まれる領域にまで侵入した状態で、前記溶接ワイヤの先端の位置が前記第1母材および前記第2母材の厚み方向において第1の深さと前記第1の深さよりも深い第2の深さとの間を往復しつつ前記アークが形成されることで、前記溶融領域が前記第1母材および前記第2母材を厚み方向に貫通するように形成される
請求項1に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程では、前記溶接ワイヤが前記第1の深さまで侵入し、前記溶接ワイヤが溶融して形成される溶摘の前記溶融領域への移行形態がローテーティング移行の状態と、前記溶接ワイヤが前記第2の深さまで侵入し、前記移行形態がローテーティング移行以外の状態とが繰り返される
請求項2に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程では、前記溶接ワイヤが前記溶融領域に取り囲まれる領域にまで侵入した状態と、前記溶融領域に取り囲まれる領域から離脱した状態とが繰り返されつつ前記アークが形成されることで、前記溶融領域が前記第1母材および前記第2母材を厚み方向に貫通するように形成される
請求項1に記載の溶接方法。 - 前記第1母材と前記第2母材とをGMA溶接により溶接する工程では、前記第1端面および前記第2端面に垂直な方向における前記溶融領域の幅に対する前記第1母材および前記第2母材の厚みが1.3以下となるように、前記第1母材と前記第2母材とが溶接される
請求項4に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程において、前記溶接ワイヤの送給速度が増減することにより、前記溶接ワイヤが前記溶融領域に取り囲まれる領域にまで侵入した状態と、前記溶融領域に取り囲まれる領域から離脱した状態とが繰り返される
請求項4又は5に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程において、前記溶接ワイヤの送給速度は30m/分以上である
請求項1~請求項6までのいずれか一項に記載の溶接方法。 - 前記第1母材および前記第2母材を準備する工程では、厚みが9mm以上30mm以下の前記第1母材および前記第2母材が準備される
請求項1~請求項7までのいずれか一項に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程では、開先の形成されていない前記第1母材と前記第2母材とが溶接される
請求項1~8までのいずれか一項に記載の溶接方法。 - 前記第1母材と前記第2母材とを溶接する工程では、100Aの電流増加に対する電圧低下が4V以上20V以下の状態で前記第1母材と前記第2母材とが溶接される
請求項1~9までのいずれか一項に記載の溶接方法。 - 前記電圧低下は5V以上である
請求項10に記載の溶接方法。 - 前記電圧低下は15V以下である
請求項10又は請求項11に記載の溶接方法。 - 前記溶接ワイヤはソリッドワイヤである
請求項1~12までのいずれか一項に記載の溶接方法。 - 前記溶接ワイヤの直径は0.9mm以上1.6mm以下である
請求項1~13までのいずれか一項に記載の溶接方法。 - 母材の被溶接部に溶接ワイヤを送給すると共に、該溶接ワイヤに溶接電流を供給することによって、前記溶接ワイヤの先端部及び被溶接部間にアークを発生させ、前記母材を溶接する消耗電極式の溶接方法であって、
前記先端部及び被溶接部間に発生したアークによって前記母材に形成された凹状の溶融部分によって囲まれる空間に前記先端部が進入する速度で、前記溶接ワイヤを送給し、
前記溶接電流の周波数が10Hz以上1000Hz以下、平均電流が300A以上、電流振幅が50A以上になるように、該溶接電流を変動させる
溶接方法。 - 母材の被溶接部に溶接ワイヤを送給すると共に、該溶接ワイヤに溶接電流を供給することによって、前記溶接ワイヤの先端部及び被溶接部間にアークを発生させ、前記母材を溶接する消耗電極式の溶接方法であって、
前記先端部及び被溶接部間に発生したアークによって前記母材に形成された凹状の溶融部分によって囲まれる空間に前記先端部が進入する速度で、前記溶接ワイヤを送給し、
前記溶接電流を周期的に変動させることにより、前記先端部及び前記溶融部分の底部間にアークが発生する第1状態と、前記先端部及び前記溶融部分の側部間にアークが発生する第2状態とを周期的に変動させる
溶接方法。 - 前記第1状態及び前記第2状態を10Hz以上1000Hz以下の周波数で変動させる
請求項16に記載の溶接方法。 - 前記第1状態はドロップ移行の溶滴移行形態を含み、
前記第2状態は、前記溶接ワイヤの前記先端部に形成される液柱及びアークが振り子状に揺動する溶滴移行形態を含む
請求項16又は請求項17に記載の溶接方法。 - 前記第1状態はドロップ移行の溶滴移行形態を含み、
前記第2状態はローテーティング移行の溶滴移行形態を含む
請求項16又は請求項17に記載の溶接方法。 - 前記第1状態は、前記溶接ワイヤの前記先端部に形成される液柱及びアークが振り子状に揺動する溶滴移行形態を含み、
前記第2状態はローテーティング移行の溶滴移行形態を含む
請求項16又は請求項17に記載の溶接方法。 - 前記溶接電流の周波数が10Hz以上1000Hz以下、平均電流が300A以上、電流振幅が50A以上になるように、該溶接電流を変動させる
請求項16~請求項20までのいずれか一項に記載の溶接方法。 - 前記溶接電流の周波数が50Hz以上300Hz以下、平均電流が300A以上1000A以下、電流振幅が100A以上500A以下である
請求項15又は請求項21に記載の溶接方法。 - 母材の被溶接部に溶接ワイヤを送給するワイヤ送給部と、該溶接ワイヤに溶接電流を供給する電源部とを備え、前記溶接ワイヤに溶接電流を供給することによって、前記溶接ワイヤの先端部及び被溶接部間にアークを発生させ、前記母材を溶接する消耗電極式のアーク溶接装置であって、
前記ワイヤ送給部は、
前記先端部及び被溶接部間に発生したアークによって前記母材に形成された凹状の溶融部分によって囲まれる空間に前記先端部が進入する速度で、前記溶接ワイヤを送給し、
前記電源部は、
前記溶接電流の周波数が10Hz以上1000Hz以下、平均電流が300A以上、電流振幅が50A以上になるように、該溶接電流を変動させる
アーク溶接装置。 - 母材の被溶接部に溶接ワイヤを送給するワイヤ送給部と、該溶接ワイヤに溶接電流を供給する電源部とを備え、前記溶接ワイヤに溶接電流を供給することによって、前記溶接ワイヤの先端部及び被溶接部間にアークを発生させ、前記母材を溶接する消耗電極式のアーク溶接装置であって、
前記ワイヤ送給部は、
前記先端部及び被溶接部間に発生したアークによって前記母材に形成された凹状の溶融部分によって囲まれる空間に前記先端部が進入する速度で、前記溶接ワイヤを送給し、
前記電源部は、
前記溶接電流を周期的に変動させることにより、前記先端部及び前記溶融部分の底部間にアークが発生する第1状態と、前記先端部及び前記溶融部分の側部間にアークが発生する第2状態とを周期的に変動させる
アーク溶接装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187005542A KR102490672B1 (ko) | 2015-08-25 | 2016-08-24 | 용접 방법 및 아크 용접 장치 |
CN201680049906.XA CN107949451B (zh) | 2015-08-25 | 2016-08-24 | 焊接方法和电弧焊接装置 |
US15/753,956 US10710187B2 (en) | 2015-08-25 | 2016-08-24 | Welding method and arc welding device |
EP16839325.4A EP3342523B1 (en) | 2015-08-25 | 2016-08-24 | Welding methods and arc welding device |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015-166233 | 2015-08-25 | ||
JP2015166233A JP6571450B2 (ja) | 2015-08-25 | 2015-08-25 | 溶接方法 |
JP2015166231A JP6637272B2 (ja) | 2015-08-25 | 2015-08-25 | 溶接方法 |
JP2015166232A JP6581438B2 (ja) | 2015-08-25 | 2015-08-25 | 溶接方法 |
JP2015-166232 | 2015-08-25 | ||
JP2015-166231 | 2015-08-25 | ||
JP2016-029260 | 2016-02-18 | ||
JP2016029260 | 2016-02-18 | ||
JP2016161844A JP6777969B2 (ja) | 2016-02-18 | 2016-08-22 | アーク溶接方法及びアーク溶接装置 |
JP2016-161844 | 2016-08-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017033978A1 true WO2017033978A1 (ja) | 2017-03-02 |
Family
ID=58100389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/074690 WO2017033978A1 (ja) | 2015-08-25 | 2016-08-24 | 溶接方法及びアーク溶接装置 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2017033978A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110505934A (zh) * | 2017-04-20 | 2019-11-26 | 株式会社达谊恒 | 电弧焊接装置以及电弧焊接方法 |
JP2020025965A (ja) * | 2018-08-09 | 2020-02-20 | 株式会社ダイヘン | アーク溶接方法及びアーク溶接装置 |
EP3939733A1 (en) * | 2019-12-25 | 2022-01-19 | Daihen Corporation | Arc welding method and arc welding device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11123553A (ja) * | 1997-10-20 | 1999-05-11 | Natl Res Inst For Metals | 溶接継手構造 |
JP2011218437A (ja) * | 2010-04-14 | 2011-11-04 | Kobe Steel Ltd | 高電流密度ガスシールドアーク溶接方法 |
JP2014159034A (ja) * | 2013-02-19 | 2014-09-04 | Nippon Steel & Sumikin Pipeline & Engineering Co Ltd | Mag溶接装置 |
-
2016
- 2016-08-24 WO PCT/JP2016/074690 patent/WO2017033978A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11123553A (ja) * | 1997-10-20 | 1999-05-11 | Natl Res Inst For Metals | 溶接継手構造 |
JP2011218437A (ja) * | 2010-04-14 | 2011-11-04 | Kobe Steel Ltd | 高電流密度ガスシールドアーク溶接方法 |
JP2014159034A (ja) * | 2013-02-19 | 2014-09-04 | Nippon Steel & Sumikin Pipeline & Engineering Co Ltd | Mag溶接装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3342523A4 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110505934A (zh) * | 2017-04-20 | 2019-11-26 | 株式会社达谊恒 | 电弧焊接装置以及电弧焊接方法 |
CN110505934B (zh) * | 2017-04-20 | 2022-01-25 | 株式会社达谊恒 | 电弧焊接装置以及电弧焊接方法 |
JP2020025965A (ja) * | 2018-08-09 | 2020-02-20 | 株式会社ダイヘン | アーク溶接方法及びアーク溶接装置 |
JP7096099B2 (ja) | 2018-08-09 | 2022-07-05 | 株式会社ダイヘン | アーク溶接方法及びアーク溶接装置 |
EP3939733A1 (en) * | 2019-12-25 | 2022-01-19 | Daihen Corporation | Arc welding method and arc welding device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102090841B1 (ko) | 직류 정극성의 회전 아크 용접 방법 및 시스템 | |
JP6777969B2 (ja) | アーク溶接方法及びアーク溶接装置 | |
KR102134045B1 (ko) | 적응식 회전 아크 용접 방법 및 시스템 | |
US20110248007A1 (en) | Arc welding method and arc welding apparatus | |
KR102490672B1 (ko) | 용접 방법 및 아크 용접 장치 | |
JP6959941B2 (ja) | アーク溶接方法及びアーク溶接装置 | |
WO2017033978A1 (ja) | 溶接方法及びアーク溶接装置 | |
CN111673283A (zh) | 一种铝合金厚板多层激光-tig复合焊接装置及方法 | |
JP6748555B2 (ja) | アーク溶接方法及びアーク溶接装置 | |
CN105960306B (zh) | 多电极单面埋弧焊接方法、焊接物的制造方法 | |
JP6211431B2 (ja) | 多電極片面サブマージアーク溶接方法、溶接物の製造方法 | |
JP7222810B2 (ja) | アーク溶接装置及びアーク溶接方法 | |
JP6885755B2 (ja) | アーク溶接方法 | |
JP6748556B2 (ja) | アーク溶接方法及びアーク溶接装置 | |
JP7475218B2 (ja) | アーク溶接方法及びアーク溶接装置 | |
JP2007069256A (ja) | 溶接装置 | |
JP6581438B2 (ja) | 溶接方法 | |
JP6571450B2 (ja) | 溶接方法 | |
JP2018083234A (ja) | 多電極片面サブマージアーク溶接方法、溶接物の製造方法 | |
JP2017042778A (ja) | 溶接方法 | |
JP2009072818A (ja) | 溶接アーク制御方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16839325 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15753956 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20187005542 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2016839325 Country of ref document: EP |