JP2009148790A - Consumable electrode type welding torch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a consumable electrode type welding torch capable of suppressing production of spatter by reliably performing the transfer of droplets by oscillating a welding wire at the frequency higher than 500 Hz or more. <P>SOLUTION: In the consumable electrode type welding torch 1, a hollow attaching tool is provided to a torch main body, and a long tip body 4 for holding a welding wire 2 as a consumable electrode is provided to the attaching tool. The tip body 4 is supported inside the attaching tool via an elastic supporting member 11. The elastic supporting member 11 supports the node N of the primary bending vibration mode in the free state of the tip body 4, and a piezoelectric device 8 for resonance of the tip body 4 in the primary bending vibration mode is provided to the tip body 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a consumable electrode type welding torch used for consumable electrode type welding, particularly gas shielded arc welding using a consumable electrode.

Conventionally, in gas shielded arc welding using a consumable electrode, there has been proposed a method for suppressing the occurrence of spatter by vibrating a welding wire which is a consumable electrode. As one of the techniques, there are Patent Document 1 and Patent Document 2.
The welding torch disclosed in Patent Document 1 vibrates the welding wire in the axial direction so that the droplets are easily detached from the tip of the welding wire and suppress the generation of large spatters. It is said that the number of droplets transferred under normal welding (number of droplets generated) is 50 to 100 times per second, and it is ensured by vibrating at a high frequency in accordance with the timing of droplet transfer. The droplet transfer is performed to suppress the occurrence of spatter. As a mechanism for vibrating at a high frequency, as shown in FIG. 2 of Patent Document 1, a wire guide is provided in a welding torch, the wire guide is swung by a driving device connected to the wire guide, and the wire is vibrated in the axial direction. It has become a thing.

  The welding torch disclosed in Patent Document 2 has a spring provided at the tip of the torch, a base end attached to the spring so as to swing around the spring, and a tip attached to the tip. A chip body (wire supply nozzle), a pair of magnetic metals arranged on opposite side surfaces of the chip body, a pair of electromagnetic coils arranged so that the coil centers coincide with the outside of the magnetic metal, and electromagnetic coils And a voltage generating device for applying a voltage. In this welding torch, by applying a voltage alternately to a pair of electromagnetic coils, the tip body can realize high-speed vibration of several tens of Hz with a spring as a fulcrum, and an appropriate welding bead is formed.

On the other hand, the applicant of the present application clarified that if the welding wire is vibrated in the direction perpendicular to the wire axis at a high frequency of 500 Hz or more, the droplet transfer at the tip of the welding wire is smoothly performed, and spatter can be reduced. It has been filed as Reference 3.
JP 2003-10970 A Japanese Patent No. 3117288 JP 2007-190564 A

However, the welding torch of Patent Document 1 is difficult to reduce the size of the torch because of the structure in which a wire guide is provided inside the torch. Further, since the welding wire is bent inside the torch, there are many structural difficulties in actual use, such as difficulty in smoothly feeding the welding wire.
Further, the technique of Patent Document 2 has a structure in which the entire tip body is forcibly vibrated in the direction perpendicular to the wire axis by electromagnetic force with a spring disposed at the base of the tip body as a fulcrum. If so, it can be foreseen that it is difficult to stably generate high-frequency vibrations of 500 Hz or more effective for suppressing spatter in such a welding torch.

  In other words, with the realistic mass and rigidity of a welding torch or welding wire that is normally considered, the tip body spring does not act as a fulcrum when an excitation force with a high frequency of 500 Hz or higher is applied, and the welding torch itself In addition, vibration is generated and the chip body itself is also bent and deformed, and it is sufficiently expected that the vibration form expected in Patent Document 2 is not achieved. Further, in the configuration in which an excitation force is applied to the spring side (base end side) of the tip body, it is assumed that the tip tip wire hardly sways and vibrates only at the base end side. Seems to be difficult to apply to welding with high frequency vibration of 500 Hz or more.

  Accordingly, in view of the above problems, the present invention has an object to provide a consumable electrode type welding torch that can vibrate a welding wire at a high frequency of 500 Hz or more to reliably perform droplet transfer and suppress spattering. To do.

In order to achieve the above object, the present invention takes the following technical means.
That is, the consumable electrode type welding torch according to the present invention is provided with a hollow mounting jig in the torch body and a long tip body for holding a welding wire as a consumable electrode in the mounting jig. The tip body is supported inside the mounting jig via an elastic support member, and the elastic support member supports a bending primary vibration mode node in the free state of the tip body. The chip body is provided with a piezoelectric element that resonates the chip body in a primary vibration mode.

According to this, the vibration of the piezoelectric element causes the chip body to be in a resonance state with a bending primary vibration mode shape, and the welding wire protruding from the tip of the chip is vibrated in a direction perpendicular to the axis at a high frequency of 500 Hz or more. Will be able to. As a result, the droplet transfer can be performed reliably and the occurrence of spatter can be suppressed.
Preferably, the tip body has a tip through which a welding wire penetrates at a central portion and holds the welding wire at a tip portion, and a hook-like member protruding in the radial direction of the tip body is provided at the middle portion. A pair of piezoelectric elements is provided along the axial direction of the body, and at least one of the piezoelectric elements is provided between the pair of flange members so that the expansion and contraction direction thereof is along the axial direction of the chip body. It is good to do.

By doing so, the welding torch can be made compact.
More preferably, an automatic tracking means for making the drive frequency of the piezoelectric element variable is provided so that the frequency of expansion and contraction of the piezoelectric element follows the change in the natural frequency of the bending primary mode of the chip body.
By doing so, even when the natural frequency changes due to the temperature change of the main welding torch during welding, the welding wire can be vibrated efficiently while always maintaining the resonance state.
Further preferably, it is preferable to have a cooling means for cooling at least one of the flange member, the piezoelectric element, and the chip body.

Thereby, even in a welding torch that becomes high temperature during welding, it is possible to reliably suppress the temperature rise of the tip body, the flange member, and the piezoelectric element supported by the tip body.
Particularly preferably, the cooling means includes a tubular member through which a coolant can flow and a flange member having a hollow portion through which the coolant can flow, the tubular member being It is good to communicate with the hollow part of the eaves member.

  By using the consumable electrode type welding torch according to the present invention, it is possible to vibrate the welding wire at a high frequency to perform the droplet transfer reliably, and to reliably suppress the occurrence of spatter.

Embodiments of a consumable electrode type welding torch according to the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a front cross-sectional view of a first embodiment of a consumable electrode type welding torch 1.
A consumable electrode type welding torch 1 (hereinafter sometimes simply referred to as a welding torch) includes a tip 3 for holding a welding wire 2 and supplying a current to the welding wire 2, and a rod-like shape having the tip 3 attached to the tip. A long chip body 4 is provided. The welding wire 2 passes through the center of the tip body 4 and the tip 3. In addition, the welding torch 1 holds a nozzle 5 for supplying a shielding gas to protect the welded portion from the atmosphere, the nozzle 5 and the tip body 4, and supplies and feeds power to the welding wire 2 and supplies cooling water. A torch body 6 (torch body) incorporating a device for the above is provided.

The right side in FIG. 1, that is, the side on which welding is performed, is referred to as the front side or the front end side in the actual apparatus, and the left side in FIG. 1 is referred to as the rear side or the rear end side in the actual apparatus. The upper and lower sides in FIG. 1 are called the upper and lower sides in an actual apparatus.
On the rear side of the chip body 4, a pair of disc-shaped flange members 7 </ b> A and 7 </ b> B are provided coaxially with the chip body 4. The flange members 7 </ b> A and 7 </ b> B are provided so as to project outward in the radial direction of the chip body 4. One flange member 7A is provided substantially flush with the rear end side of the chip body 4, and the other flange member 7B is provided on the front side separated from the one flange member 7A by a predetermined distance. The flange members 7A and 7B are formed integrally with the chip body 4 or have a screw structure, and are firmly fixed to the chip body 4. When the flange members 7A and 7B are screw type, it is desirable to prevent the screws from loosening due to vibration, such as fixing with an adhesive or a double nut.

  A piezoelectric element 8 is provided between the pair of flange members 7A and 7B and on the peripheral side of the flange members 7A and 7B. The piezoelectric element 8 is a laminated piezoelectric element 8 that expands and contracts in the longitudinal direction in conjunction with the frequency of the applied voltage. One or more expansion / contraction directions are provided so as to be the front-rear direction of the chip body 4 (direction along the chip body 4). In the case of the present embodiment, one piezoelectric element 8 is provided on the upper side of the flange members 7A and 7B, but may be provided on the lower side or a pair of upper and lower sides. In the case of a pair of upper and lower sides, it is preferable to give a fluctuation voltage of opposite phase to both piezoelectric elements 8 and 8. By arranging two piezoelectric elements 8 at the top and bottom, the piezoelectric element 8 that is smaller than the single arrangement can be used, and the entire apparatus can be made compact.

A heat insulating material 9 is provided between the piezoelectric element 8 and the flange members 7A and 7B for the purpose of suppressing the temperature rise of the piezoelectric element 8 during welding. Further, the piezoelectric element 8 is fixed in a state in which a compressive load is applied thereto by a pair of front and rear flange members 7A and 7B. As the heat insulating material 9, in order to reliably transmit the expansion and contraction of the piezoelectric element 8 to the flange members 7A and 7B, a highly rigid member such as ceramic may be used. It is also possible to manufacture the flange members 7A and 7B themselves with a heat insulating material having sufficiently high rigidity and strength.
With respect to the chip body 4 of the present embodiment, the dimensions, shapes, and weights of the chip body 4 and the flange members 7A and 7B are such that the vibration of the bending primary mode in the free state (free state) is as shown in FIG. Etc. are selected. The calculation of the vibration mode and the design of the dimensions of each member based on the calculation of the vibration mode may be performed using a beam vibration theory or an existing vibration model.

  As shown in FIG. 1, in the chip body 4, the approximate center between the pair of flange members 7A and 7B and the rear side of the chip 3 are vibration nodes (nodes N). The tip body 4 is connected to a cylindrical jig 10 (attachment jig) provided at the tip of the torch body 6 at the position of the node N appearing at the approximate center between the pair of flange members 7A and 7B. Specifically, it attaches via the elastic support member 11 (rectangular flat plate) extended in the left-right direction. By using a metal material such as stainless steel, steel, copper, or aluminum for the elastic support member 11, a welding current can be supplied from the cylindrical jig 10 to the tip body 4.

As shown in FIG. 2, the rear end side of the chip body 4 is larger in mass than the front end side, and therefore the vibration amplitude is reduced. On the other hand, at the tip of the welding wire 2, a greater vibration appears due to the effect of elastic deformation at a position away from the node N. By utilizing such a bending primary mode of the tip body 4, a small amplitude vibration generated in the piezoelectric element 8 itself causes a large amplitude vibration at the tip of the welding wire 2 (amplitude at the tip of the welding wire 2: about 0. 0). 1 mm).
By the way, in the node N of the bending primary mode, although the displacement in the horizontal direction is small, the displacement in the rotational direction (torsional displacement around the axis perpendicular to the plane of the paper in FIG. 2) is relatively large. Therefore, in order not to constrain such rotational displacement, a flat plate having low “torsional rigidity” is used as the elastic support member 11. However, if the rigidity of the elastic support member 11 is too low, the chip body 4 is wobbling, and thus appropriate rigidity (rigidity) is required. As a guideline, the natural frequency of the chip body 4 due to the deformation of the elastic support member 11 is lower than 1/2 to 1/3 of the natural frequency of the chip body 4 alone, and wobbling of the chip body 4 is a problem. Rigid rigidity is not allowed. In the present invention, since the target frequency is 500 Hz or more, this condition can be easily realized.

The position of the node N and the attachment position of the elastic support member 11 do not have to be strictly matched. This is because even if the mounting position is slightly deviated, the elastic support member 11 is bent and deformed, so that the rotational displacement of the tip body 4 does not occur and the bending primary mode is not affected.
As shown in FIG. 1, with respect to the cylindrical jig 10 in which the tip body 4 is attached through the elastic support member 11, the rear end side is attached to the welding torch 1, and the funnel-shaped insulator 12 is attached to the front end side. Is provided. A nozzle 5 is provided at the tip of the insulator 12 so that the tip 3 has an internal through shape.

Resins and ceramic materials are used for the insulator 12 to fix the nozzle 5 and to electrically insulate the nozzle 5 itself. The insulator 12 may be made of a metal material as long as the connecting portion with the cylindrical jig 10 has an insulating structure.
In addition, since the structure from the torch body 6 to the nozzle 5 serves also as the role which sends shield gas to a welding part, it is set as sealed piping shape. That is, the shielding gas such as CO ₂ supplied from the torch body 6 side is jetted so as to surround the welding wire 2 from the tip of the nozzle 5 through the cylindrical jig 10 → the insulator 12 → the nozzle 5. The shielding gas passing through the cylindrical jig 10 also has an effect of cooling the piezoelectric element 8 and the flange members 7A and 7B. The shield gas may be supplied as follows: torch body 6 → inside of chip body 4 → several holes (not shown) provided on the side surface of chip body 4 → insulator 12 → nozzle 5.

When using the welding torch 1 described above, first, the welding wire 2 is inserted and penetrated into the tip body 4 provided in the cylindrical jig 10. Thereafter, the tip 3 is firmly fastened to the tip of the tip body 4. Thereafter, current is supplied to the welding wire 2 through the tip 3 to perform welding. At that time, shield gas such as CO ₂ gas is supplied into the cylindrical jig 10 from the torch body 6 side. Thereby, it will be in the gas shield state from which oxygen was interrupted | blocked in the welding part vicinity.
The frequency of the welding wire 2 is determined by the natural frequency of the tip body system S including the piezoelectric element 8 and the flange members 7A and 7B for attaching the piezoelectric element 8. The natural frequency of the chip body system S can be easily adjusted by changing the length and diameter of the chip body 4, the mass of the flange members 7A and 7B, etc., and can have a high natural frequency of 500 Hz or more. is there.

At the time of welding, a driving voltage having the same frequency as the natural frequency of the tip body system S is applied to the piezoelectric element 8 disposed between the flange members 7A and 7B. Then, the chip 3 and the chip body 4 vibrate together and are brought into a resonance state by the piezoelectric element 8. Therefore, by adjusting the natural frequency of the chip body system S and the driving voltage of the piezoelectric element 8, the tip of the welding wire 2 is vibrated at a high frequency in the direction perpendicular to the axial center, and the droplet transfer is surely performed, and spatter is generated. It can be suppressed.
Since the chip body 4 has an integrated structure with no play, the vibration attenuation is small and a large resonance magnification can be obtained. In addition, since the node N of the bending primary mode is elastically supported, the natural vibration characteristics of the tip body system S hardly change, and the vibration from the elastic support member 11 (support point) to the torch body 6 Energy outflow is minimized.

If the rigidity of the elastic support member 11 is lowered (if it is softly supported), the same effect (small change in natural frequency, small energy outflow) can be obtained even when the tip body 4 is supported at a portion (abdomen) where vibration is large. However, since the restraining force is weak with soft support, the tip body 4 tilts downward or fluctuates when the welding torch 1 is moved, so that the positioning accuracy of the wire tip is lowered. Therefore, support at the node N is indispensable.
As another example of the embodiment of the welding torch 1 described above, the one shown in FIG. 3 is also conceivable. That is, the pair of eaves members 7A and 7B are rectangular convex members as viewed from the side. The convex scissors members 7A and 7B are completely fixed to the chip body 4 by integral molding or welding, and the piezoelectric element 8 is interposed between the scissors members 7A and 7B by using the push screw 13 provided on the scissors member 7A. Is installed in a pressed state.
[Second Embodiment]
Next, a second embodiment of the consumable electrode type welding torch according to the present invention will be described.

As shown in FIGS. 4 and 5, the second embodiment is greatly different from the first embodiment in that the frequency of expansion and contraction of the piezoelectric element 8 follows the change in the natural frequency of the bending primary mode of the chip body 4. Therefore, the piezoelectric element 8 is connected to the automatic tracking means 20 that makes the drive frequency of the piezoelectric element 8 variable. Other configurations are substantially the same as those of the first embodiment.
The temperature of the tip 3 and the tip body 4 rises during welding, and the natural frequency of the tip body system S changes due to a decrease in the Young's modulus of the metal constituting them. When the piezoelectric element 8 is vibrated at a frequency somewhat away from the natural frequency, the influence of the change in the natural frequency due to a temperature change or the like is not significant, but when vibrating in a resonance state, the natural vibration The vibration amplitude of the welding wire 2 changes greatly according to the change in the number. By performing automatic tracking that changes the drive frequency of the piezoelectric element 8 in accordance with the change in the natural frequency of the chip body system S, such a situation can be flexibly dealt with.

FIG. 4 shows the welding torch 1 of the present embodiment.
The saddle member 7A provided on the welding torch 1 is provided with a vibration sensor 21 capable of detecting a vibration frequency and the like, and the actually measured frequency is sent to the automatic tracking means 20. The automatic tracking means 20 includes a control circuit 22, a frequency generator 23, and a piezoelectric element drive amplifier 24.
The “measurement signal of the vibration frequency of the chip body 4” sent to the control circuit 22 of the automatic tracking means 20 is compared with the output signal of the piezoelectric element drive amplifier 24, and the resonance frequency is set so that the phase difference between them is constant. Calculated (PLL control). The calculated resonance frequency is sent to the frequency generator 23, and a sine wave having the resonance frequency is generated. This sine wave is sent to the piezoelectric element drive amplifier 24 and amplified to become an output signal, which drives the piezoelectric element 8.

By doing so, even if the temperature of the tip 3 and the tip body 4 changes, the piezoelectric element 8 can always bring the tip body 4 into a resonance state, and the welding wire 2 is vibrated greatly to ensure the droplet transfer. Can be done.
The vibration sensor 21 may be attached at any position other than the node portion N of the chip body 4.
FIG. 5 shows another welding torch 1 according to the present embodiment.
The chip body 4 of the present embodiment is not provided with the vibration sensor 21, and current information (current value) generated from the piezoelectric element 8 is input to the control circuit 22. Since it is clear that the phase of the current flowing in the circuit coincides with the phase of the voltage at the time of resonance, the “current signal of the piezoelectric element 8” sent to the control circuit 22 of the automatic tracking means 20 is a piezoelectric element drive. It is compared with the voltage signal of the amplifier 24, and the resonance frequency is calculated so that the phase difference between them matches (PLL control). The calculated resonance frequency is sent to the frequency generator 23, and a sine wave having the resonance frequency is generated. This sine wave is sent to the piezoelectric element drive amplifier 24 and amplified to become an output signal, which drives the piezoelectric element 8.

Thereby, even if the temperature of the chip 3 and the chip body 4 changes, the piezoelectric element 8 can always be in the resonance state of the chip body 4, and the welding wire 2 can be vibrated greatly and the droplet transfer can be reliably performed. it can.
Since it is known that the current value of the circuit becomes maximum at the time of resonance and the current value becomes minimum at the time of anti-resonance, the current value of the piezoelectric element 8 is measured and the resonance frequency is controlled to be maximum or minimum. May be.
[Third Embodiment]
Next, a third embodiment of the consumable electrode type welding torch 1 according to the present invention will be described.

The third embodiment differs greatly from the first embodiment in that it has a cooling means 30 for cooling the chip body 4, the flange members 7 </ b> A and 7 </ b> B, and the piezoelectric element 8. Other configurations are substantially the same as those of the first embodiment.
As shown in FIGS. 6 and 7, the cooling means 30 has a tubular member (a supply pipe 32 and a discharge pipe 33) through which a cooling liquid can flow and a cooling liquid (cooling water) can flow therethrough. The tubular members 32 and 33 are configured to communicate with the hollow portions 31 of the flange members 7A and 7B.

In FIG. 6, only the front side flange member 7B is water cooled.
That is, the hollow portion 31 is formed inside the flange member 7B close to the chip 3 side. The hollow portion 31 communicates with the tip of a supply pipe 32 for supplying cooling water from the side surface side of the flange member 7B, and guides the cooling water to the hollow portion 31 of the flange member 7B. On the other hand, a discharge pipe 33 for discharging the cooling water in the hollow portion 31 to the outside is provided on the side surface of the front flange member 7B on the opposite side of the position where the supply pipe 32 is connected vertically (or left and right). It has been. The cooling water supplied into the hollow portion 31 returns to the torch body 6 side through the discharge pipe 33.

  Since the supply pipe 32 and the discharge pipe 33 are fixed to the cylindrical jig 10 so as to penetrate the cylindrical jig 10, they also serve as the elastic support member 11 that supports the chip body 4. In particular, as shown in FIG. 6, the chip body 4 is bent at a right angle in the vicinity of the node N in the primary mode of bending (a structure in which the node N and the bent portion 34 correspond). In this way, although the torsional rigidity of the pipe itself is relatively high, the “pipe 32” is caused by bending deformation of the pipes 32 and 33 (bending deformation of the pipe in a cantilever state) extending from the side surface of the flange member 7B to the bent portion 34. , 33 can be reduced, and the tip body 4 is supported by the cylindrical jig 10 in a vibration-free state.

In this way, by cooling the front flange member 7B close to the welded portion, the heat generated by the welding is hardly transmitted to the piezoelectric element 8, and a heat insulating material provided between the piezoelectric element 8 and the flange member 7B. 9 can be eliminated. By cooling the flange member 7B, the chip body 4 itself is also cooled, and heat transfer to the torch body 6 side is reduced.
FIG. 7 shows a configuration in which both the pair of front and rear flange members 7A and 7B are water-cooled.
That is, the hollow part 31 is formed inside the both flange members 7A and 7B. On the other hand, the supply pipe 32 provided so as to penetrate the side surface of the cylindrical jig 10 and enter the inside thereof is divided into two parts in the middle, and the respective leading end portions are connected to the side surfaces of the two flange members 7A and 7B. The cooling water supplied from the torch body 6 side can be introduced into the hollow portion 31 in communication with the hollow portion 31 of the members 7A and 7B.

A discharge pipe 33 for discharging the cooling water in the hollow portion 31 to the outside is provided on the side of the flange members 7A and 7B on the side opposite to the position where the supply pipe 32 is connected vertically (or left and right). Yes. The discharge pipe 33 becomes a single discharge pipe 33 in the middle (that is, the discharge pipe 33 is also bifurcated), and has a structure that penetrates the side surface of the cylindrical jig 10 and is led out to the outside. The cooling water supplied into the hollow portion 31 returns to the torch body 6 side again through the discharge pipe 33.
Since the supply pipe 32 before bifurcating and the discharge pipe 33 before bifurcating are fixed to the cylindrical jig 10 so as to penetrate the cylindrical jig 10, the elastic support member 11 that supports the chip body 4. Also serves as a role. Similar to the above-described “configuration in which only the front flange member 7B is water-cooled”, a structure that bends at right angles in the vicinity of the node N in the primary mode of bending of the chip body 4 (a structure in which the node N and the bent portion 34 correspond). It is said. Therefore, the tip body 4 is supported by the cylindrical jig 10 in a vibrationally free state.

In this way, by cooling both flange members 7A and 7B, the piezoelectric element 8 is hardly transmitted with heat due to welding, and the heat insulating material 9 can be dispensed with. By cooling the flange members 7A and 7B, the chip body 4 itself is also cooled, and heat transfer to the torch body 6 side is also reduced.
In summary, since the piezoelectric element 8 is firmly fixed to the chip body 4 through the flange members 7A and 7B, heat during welding is transmitted. Generally, the allowable temperature of the piezoelectric element 8 is about 85 ° C. to 150 ° C. (from the catalog of the piezoelectric element manufacturer), and the temperature of the tip body 4 becomes equal to or higher than the allowable temperature of the piezoelectric element 8 during welding.

Although the heat insulating material 9 is provided on the flange members 7A and 7B to which the piezoelectric element 8 is attached, the temperature rise of the piezoelectric element 8 can be suppressed to some extent due to the air cooling effect by the shielding gas. Possible damage. However, by providing the cooling means 30 in the welding torch 1, the temperature rise of the piezoelectric element 8 can be reliably suppressed. Furthermore, by using the supply pipe 32 and the discharge pipe 33 as the elastic support member 11 that supports the chip body 4, it is possible to reduce the number of parts and reduce the cost.
As described above, the consumable electrode type welding torch according to the present invention is not limited to the above-described embodiment.

(A) is front sectional drawing of 1st Embodiment, (b) is the same plane sectional drawing, (c) is the sectional view on the AA line in (b). It is the figure which showed the vibration state (bending primary mode) of the chip body. (A) is front sectional drawing of another example of 1st Embodiment, (b) It is the side sectional drawing. It is a figure which shows 2nd Embodiment. It is a figure which shows another example of 2nd Embodiment. It is front sectional drawing of 3rd Embodiment. It is front sectional drawing of another example of 3rd Embodiment.

Explanation of symbols

1 Consumable Electrode Welding Torch 2 Welding Wire 3 Tip 4 Tip Body 5 Nozzle 6 Torch Body (Torch Body)
7A 鍔 member 7B 鍔 member 8 Piezoelectric element 9 Heat insulating material 10 Cylindrical jig (mounting jig)
DESCRIPTION OF SYMBOLS 11 Elastic support member 12 Insulator 13 Push screw 20 Automatic tracking means 21 Vibration sensor 22 Control circuit 23 Frequency generator 24 Piezoelectric element drive amplifier 30 Cooling means 31 Hollow part 32 Supply pipe 33 Discharge pipe 34 Bending part N Node part S Chip body system

Claims (5)

A consumable electrode type welding torch in which a hollow mounting jig is provided in the torch body, and a long tip body for holding a welding wire as a consumable electrode is provided in the mounting jig,
The tip body is supported inside the mounting jig via an elastic support member, and the elastic support member supports a node portion of a bending primary vibration mode in a free state of the tip body,
A consumable electrode type welding torch, wherein the chip body is provided with a piezoelectric element that resonates the chip body in a primary vibration mode. The tip body has a tip through which a welding wire penetrates at the center portion and holds the welding wire at a tip portion, and a flange member protruding in the radial direction of the tip body is provided at the middle portion of the tip body. A pair is provided along the direction,
2. The consumable electrode welding according to claim 1, wherein at least one of the piezoelectric elements is provided between the pair of flange members so that an expansion / contraction direction thereof is along an axial direction of the tip body. torch.   2. An automatic tracking means for making the drive frequency of the piezoelectric element variable so that the frequency of expansion and contraction of the piezoelectric element follows the change in the natural frequency of the bending primary mode of the chip body. The consumable electrode type welding torch according to 1 or 2.   The consumable electrode type welding torch according to any one of claims 1 to 3, further comprising a cooling means for cooling at least one of the flange member, the piezoelectric element, and the chip body.   The cooling means includes a tubular member through which a coolant can flow and a flange member having a hollow portion through which the coolant can flow, and the tubular member is a hollow member of the flange member. The consumable electrode type welding torch according to claim 4, wherein the consumable electrode type welding torch is in communication with a portion.

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