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
  • B23K9/16—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
• • 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
  • B23K9/1735—Arc welding or cutting making use of shielding gas and of a consumable electrode making use of several electrodes
• • 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

Definitions

• the present invention relates to a consumable multi-electrode arc welding method in which a plurality of wires are fed into a single torch, and more particularly to a welding control method for the welding end portion.
• a consumable electrode arc welding method of feeding and welding a wire in a torch a consumable single electrode arc welding method of feeding one wire in one torch has been used.
• a consumable multi-electrode arc welding method in which welding is performed by feeding a plurality of wires in one torch is also used.
• the consumable multi-electrode arc welding method is applied to an automatic can-making process, and is used as one of the means for improving the production efficiency by high welding.
• high deposition welding means welding performed by generating deposited metal with high efficiency.
• the welding progress direction is maintained while the arc generation of the consumable electrode preceding the welding progress direction is maintained. It shows how to back and weld in the opposite direction.
• An object of the present invention is to provide a welding method for preventing the occurrence of wire welding of all welding wires at the end of welding in the consumable multi-electrode arc welding method.
• a welding bead is formed while moving the torch in the welding progress direction while feeding and energizing a plurality of wires in one torch.
• a consumable electrode arc welding method comprising the steps of: stopping feeding and energization of all the wires except for one of the plurality of wires identified at the welding end position; And a second step of moving the torch from the welding end position to a position opposite to the welding advancing direction and in a direction away from the welding bead by a predetermined amount.
• the present invention has a third step of moving the torch from the position of the torch, which has been moved in the second step, substantially parallel to the weld bead in the welding advancing direction.
• one wire identified in one torch is a wire located at the most advanced position in the torch when moving the torch in the welding advancing direction. .
• welding is performed with a welding completion welding condition different from the welding conditions used so far by one wire specified in one torch.
• the welding conditions at the end of welding are provided.
• the cratering process is performed to fill in the depression generated at the welding end.
• the fourth step of stopping the wire feeding and energization and welding of all the wires to the welding bead is performed.
• the method includes the fifth step of confirming presence / absence and the sixth step of resuming energization to at least the wire when welding is detected in the fifth step.
• the contact between the welding pool and all the wires can be avoided, and the welder welds to the welding pool. Can be prevented. Further, even if any wire is welded to the weld pool, by releasing the welding, it is possible to prevent the entire apparatus from being in a state of operation stoppage due to the occurrence of welding.
• FIG. 1 A diagram showing a stage before reaching a welding end position in the first embodiment of the present invention.
• FIG. 2 A diagram showing the position where the welding end position is reached in the first embodiment of the present invention.
• FIG. 3 A diagram showing a first step of a welding control method of a welding end portion in Embodiment 1 of the present invention.
• FIG. 4 A diagram showing a second step of the welding control method of the welding end portion in Embodiment 1 of the present invention.
• FIG. 5 A diagram showing a control processing flow of welding end control at a welding end portion in Embodiment 1 of the present invention.
• FIG. 6 A diagram showing a control processing flow of welding termination control of a welding termination portion in Embodiment 1 of the present invention.
• Step 301 Stop feeding and energizing all wires except for one wire to be identified
• Step 312 Check all wires for welding with weld bead
• Step 313 Restart power to the wires
• w is the welding advancing direction of main welding
• 1 is a torch
• 2 is a consumable electrode wire (hereinafter referred to as leading wire) leading to the welding advancing direction of main welding
• 3 is a main welding Consumable electrode wire (hereinafter referred to as trailing wire) trailing in welding direction w
• 4 is an arc generating leading wire
• 5 is an arc generating trailing wire
• 6 is formed Weld bead
• 7 is a molten pool
• 8 is a weld metal.
• each wire 2 and 3 is continuously supplied by a feeding device, as shown. Furthermore, it is illustrated! / ⁇ melting
• the welding machine is connected separately to each wire, and each welding machine performs welding by controlling the power supply to each wire 2 and 3 and the feeding device for feeding each wire 2 and 3.
• FIG. 1 is a diagram showing a stage before reaching the welding end position, showing a state in which two wires 2 and 3 force arcs 4 and 5 are generated to perform main welding, Ru. Then, a molten metal pool 7 of molten metal exists immediately below the workpieces 4 and 5, and as the welding progresses in the w direction, the metal pool 7 forms a mass and forms a weld bead 6.
• FIG. 2 is a view showing the position where the welding end position is reached, and shows a state immediately before performing welding control to be performed on the welding end portion, which is a feature of the present embodiment. .
• this welding control performed from the end point of welding is the feature of the present embodiment.
• the amount of molten metal in the molten pool 7 is not sufficient compared to the weld bead 6 up to that point, and the weld bead ends formed as a result when welding is finished as shown in the figure. 7a occurs. Therefore, it is necessary to perform welding to fill it.
• FIG. 3 is a diagram showing a first step of the welding control method of the welding end portion in the present embodiment.
• la indicates the torch position (indicated by one representative point) at the welding end position
• lb indicates the torch position (represented by one point representatively) to which the torch la has advanced to the welding end position.
• Positions la and lb are separated by a distance of L in the horizontal direction and Tz in the vertical direction.
• the welding distance to the torch position lb which is a distance Tz apart in a direction to separate the welding wire 2 from the molten pool 7 vertically by a predetermined horizontal distance L Welding is performed while moving in the direction opposite to the direction w and upward movement, that is, in the upward direction indicated by the arrow a.
• the two wires 2 and 3 are melted by the movement movement in the diagonal direction with respect to the welding advancing direction w indicated by the arrow a in the direction of moving the welding wires 2 and 3 away from the melting pool 7.
• FIG. 4 is a diagram showing a second step of the welding control method of the welding end portion in the present embodiment, and as shown in FIG. 4, from torch position lb to torch position lc (one point of representative) ), While moving in the horizontal direction substantially parallel to the welding direction w indicated by the arrow b, welding is further performed to fill the crater 7a.
• the movement in the direction of arrow b also operates following the movement in the direction of arrow a of FIG.
• the two wires 2 or 3 can be prevented from contacting the molten pool 7.
• the values of these distance L and ⁇ are determined by the welding conditions, so that the shape at the end of welding can be neatly shaped and the number that can prevent the wire from welding with the weld pool 7 is selected.
• the operating speed and welding conditions at this time are controlled by the preset ones.
• the current to the wire 3 is ended.
• the welding may be stopped for a predetermined time and then the energization may be ended.
• the welding progress direction w of the torch 1 is illustrated as an example in which it moves in the horizontal direction as an example, but of course the present invention is not limited to this. Depending on the situation, the welding progress direction w of the torch 1 may be any direction. Also, in relation to that, the direction in which the torch 1 is separated from the molten pool 7 is not limited to the vertically upward direction as long as it is a direction apart from the molten pool 7 without being limited thereto.
• FIG. 5 is a diagram showing a control processing flow of the welding end control.
• step 201 in the drawing the current supply to the other feeders is stopped while leaving a predetermined wire for crater welding. This corresponds to the part where the arc generation of the leading wire 2 shown in FIG. 2 is continued while the energization of the trailing wire 3 is ended and the arc generation is ended.
• step 202 voltage is applied to the wire (that is, the leading wire 2) that continues to be energized.
• the welding conditions are switched to the welding conditions for welding performed by moving movement in the direction of arrow a in FIG. If it is not necessary to switch the conditions, this step 202 may be skipped without doing anything.
• step 203 the process is stopped for a predetermined time in order to wait for the switched condition to be stabilized. Also in this step 203, it is possible to skip if it is not necessary according to the welding machine to be used.
• step 204 a movement operation is performed to move in the direction of arrow a in FIG.
• step 205 the welding conditions applied to the wire continuing to be energized are switched to the welding conditions of the welding performed by the movement in the direction of the arrow b in FIG. Also in this case, if it is not necessary to switch the conditions, step 205 may be skipped without doing anything.
• step 206 the process is paused for a predetermined time in the sense that the switched condition is stabilized. This step 206 can also be skipped if it is not necessary depending on the welding machine used.
• step 207 an operation of moving in the direction of the arrow b in FIG. 4 is performed.
• step 208 the welding condition is switched to the welding condition of the final stop by applying to the wire which continues to be energized. Also in this case, if there is no need to switch the conditions, this step 208 may skip without doing anything.
• step 209 the process is stopped for a predetermined time. This step 209 can also be skipped if it is not necessary depending on the welding machine used.
• step 210 the current supply to all the wires and the wire feeding are stopped to stop the arc generation.
• the wires 2 and 3 move away from the molten pool 7 while crater filling welding is performed, thereby avoiding fusion of the wires. be able to.
• the example of tandem welding in the consumable multi-electrode arc welding in which two wires are fed and welded in one torch is limited to two wires. Also, even if there are three or more wires, the same effect can be obtained by stopping energization of the wires and wire feeding for the remaining wires except for one wire.
• FIG. 6 is a diagram showing a control processing flow of welding termination control in the present embodiment.
• step 301 to step 309 in FIG. 6 correspond to step 201 in FIG. 5 and step 209 in FIG. 5, and the operation of control processing is identical. Therefore, in the present embodiment, steps 301 to 309 are simplified in order to avoid duplication, and mainly step 310 and later will be described.
• step 307 the movement in the direction of arrow b in FIG. 4 is performed, and in step 308, the welding condition applied to the wire continuing to be energized is finally stopped. After switching to the welding conditions for welding, stop at step 309 for a predetermined time, if necessary.
• step 310 processing for releasing the wire welding is performed.
• step 310 energization of all the wires and wire feeding are stopped to stop the occurrence of the burr.
• step 311 the generation of the arc and the feeding of the wire are completely stopped, and the state of the wire and the welding bead is stopped for a predetermined time to wait for the state to be stabilized. Note that this step 311 can be skipped if not necessary.
• step 312 it is checked whether all the wires are welded.
• confirmation is made by applying a voltage to the wire and confirming the conduction state with the base material, making use of the fact that the wire and the base material are electrically connected when welding is performed.
• the welding machine used has a function to detect wire welding
• the state of wire welding is detected by reading the welding machine status signal using that function.
• the confirmation of the presence or absence of welding is carried out with all the wires, in order to check including the following wires only with the preceding wires and also for the present embodiment.
• the example of consumable multi-electrode arc welding in which two wires are fed and welded in one torch is shown. This is to confirm the status.
• step 312 if there is no welding, welding end control is completed. If it is detected that any wire is in a welded state, the process proceeds to step 313.
• step 313 in order to release the welded state of the wire, the welding wire which has been detected at least in the welded state is energized again. At that time, welding conditions and the time for energizing are set in advance according to a predetermined method. After this, the process proceeds to step 314, the number of times the series of processes from step 310 to 313 is performed is counted, and it is checked whether or not a predetermined number set in advance has been reached. And even if it reaches a predetermined number of times, the welding state of the wire can not be released, in which case an error is generated and all operations are stopped. If the predetermined number of times has not been reached, the process returns to step 310, and the wire welding release processing in step 310 and subsequent steps is performed again.
• the wire welding state can be canceled by reenergizing the wire welding state in step 313, and the operation of the entire apparatus is stopped. It is possible to prevent the occurrence of situations that must be done.
• the consumable multi-electrode arc welding method of the present invention in the consumable multi-electrode arc welding method in which a plurality of wires are fed into one torch, prevention of occurrence of wire welding at the end of welding and a method for avoiding occurrence when it occurs. It is industrially useful as a control method for welding robots and automatic welding equipment.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Mechanical Engineering (AREA)
• Arc Welding In General (AREA)
• Arc Welding Control (AREA)

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• 2004
  • 2004-04-20 JP JP2004123953A patent/JP3867712B2/ja not_active Expired - Fee Related
• 2005
  • 2005-04-20 EP EP05734546A patent/EP1671734B1/en not_active Expired - Lifetime
  • 2005-04-20 US US10/566,848 patent/US7241968B2/en not_active Expired - Lifetime
  • 2005-04-20 KR KR1020067002630A patent/KR101138659B1/ko not_active Expired - Fee Related
  • 2005-04-20 WO PCT/JP2005/007543 patent/WO2005102580A1/ja not_active Ceased
  • 2005-04-20 AT AT05734546T patent/ATE544556T1/de active
  • 2005-04-20 CN CNB2005800006488A patent/CN100441353C/zh not_active Expired - Fee Related
  • 2005-04-20 CA CA2534575A patent/CA2534575C/en not_active Expired - Fee Related

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