JP3472350B2 - Contact tip for arc welding and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact tip for arc welding used in a welding operation, in which a consumable electrode wire is fed while being fed by a welding torch and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, in arc welding work using a consumable electrode wire, a through hole is formed in the shaft core of a contact tip mounted on a welding torch, and the electrode wire is fed through the through hole while feeding power from the contact tip. Are doing. By the way, at the time of power feeding, the contact portion between the electrode wire and the contact tip becomes hot, and the through hole of the contact tip tends to be worn due to the feeding of the electrode wire. When the electrode through hole of the contact tip is worn in this way, the state of power supply to the electrode wire changes, and a uniform welding result cannot be obtained.

In order to deal with this, a conventional method, for example, FIG.
As shown in (A), the chip body portion 1 ′ and the core portion 2
′ Together with the contact tip 3 ′, and a tip body portion in which a through hole 101 for feeding an electrode wire is provided in a shaft core portion, and a screw portion 102 for attaching to a welding torch (not shown) is provided at one end portion. 1'is made of relatively soft copper or copper alloy, and an axial recess 106 is formed at the other end of the chip body 1 '. Further, the core portion 2'has a through hole 201 in the shaft core portion and is formed of a hard conductive metal having excellent heat resistance and wear resistance. The core portion 2'is formed of the chip body portion 1 '. The core 2 ′ is pressed into the recess 106 by a so-called swaging process in which the chip body 1 ′ is loosely inserted into the recess 106 and then the chip body 1 ′ is radially pressed from the outside.

Further, conventionally, FIG. 8B and FIG.
The structure shown in (C) has been proposed. That is, as shown in FIG. 8 (B), a circumferential groove 202 is provided outside the core portion 2 ′ made of a hard material, or as shown in FIG. 8 (C), a step portion 203 is formed in the core portion 2 ′. When the contact tip 3'is provided with swaging, the circumferential groove 202 or the stepped portion 203 and the tip body portion 1'made of a soft material are engaged and locked. .

During the swaging process for the contact tip 3'shown in FIGS. 8 (A) to 8 (C), as shown in FIG. 8 (D), the core portion 2'has a relatively inner diameter. A large through hole 201 is provided, and in a state where the core portion 2'is inserted into the recess 106 of the chip body portion 1 ', the through holes 201, 1 of the core portion 2'and the chip body portion 1'are provided.
01, a hard wire 50 having a diameter slightly larger than the desired diameter of the electrode wire is inserted, and the swaging dies 51 to 54 are pressed in the radial direction from the outside of the chip body 1'to perform swaging. Is being carried out.

Furthermore, conventionally, a wear resistant member having a through hole for an electrode wire has been attached to the tip of the chip body by shrink fitting, bonding or brazing.

[0007]

However, as shown in FIG. 8, when the recess 106 of the chip body 1'and the core 2'are locked by so-called swaging, the following problems occur. is there. That is, the welding current is
Power is supplied to the tip body 1 '→ the core 2' → the electrode wire. Particularly, at the time of welding, the tip portion of the contact tip is exposed to arc heat, so that the power supply to the electrode wire, That is, the contact portion and its vicinity have high temperatures. By the way, focusing on the engaging portion between the chip body 1'and the core 2 ', the coefficient of thermal expansion of the chip body 1'is larger than the coefficient of thermal expansion of the hard core 2'. Therefore, that is, since the coefficient of thermal expansion of the chip body 1 ′ enclosing the core 2 ′ is large, if the temperature of the power feeding part becomes high as described above,
In the structure shown in FIG. 8A, the chip body 1
The locking state of the locking portion between the ′ and the core portion 2 ′ becomes loose.

Further, for example, in a semi-automatic arc welding operation, the welding torch gripped by the operator is left undisturbed on the work piece or the work table after welding. At times, as described above, the tip body 1'and the core 2'are locked loosely. Therefore, when the impact force that accompanies leaving the welding torch is added, the state shown in FIG. In the contact tip 3'shown, loosening of the engaging portion between the tip body portion 1'and the stopping portion 2'is promoted. As a result, the core portion 2'is slightly displaced from the tip body portion 1'in the long axis direction or in the rotation direction, and the contact state between the core portion 2'and the tip body portion 1'is delicately. Change. In the welding work, the welding work is repeated with one cycle from the start of welding to the end of welding. As the welding work is repeated, the core portion 2'and the tip body portion 1'are displaced. The amount becomes large,
Since the power supply state from the tip body portion 1'to the core portion 2'changes from the initial state, a uniform welding result cannot be obtained. Of course, by repeating the welding operation, loosening of the locking portion between the tip body portion 1'and the stopping portion 2'is further promoted, and in an extreme case, the core portion 2'is replaced by the tip body portion 1 '. The contact tip 3'becomes expensive because the contact tip 3'is frequently replaced with the contact tip 3'replaced frequently.

Also, in a contact chip in which a wear resistant member having a through hole for an electrode wire is attached to the tip of the chip body by shrink fitting, bonding or brazing,
As described above, in combination with the fact that the tip of the contact tip has a high temperature and the coefficient of thermal expansion of the wear resistant member and the chip body are different, the wear resistant member and the chip body are as described above. Since the impact force acts on the mounting part of the and the wear resistant member is released from the mounted state, the wear resistant member is detached from the tip body part, the welding work becomes impossible, and the contact tip is frequently used. As a result, the contact tip was expensive.

Furthermore, FIG. 8 (B) and FIG. 8 (C)
In the structure shown in Fig. 3, it takes time to process the circumferential groove 202 and the stepped portion 203 as described above on the hard core portion 2'which is difficult to process, resulting in an expensive contact tip. Was there.

On the other hand, the main purpose of the swaging process shown in FIG. 8D is to conform the through hole 201 of the core 2'to the hard wire 50. By the way, the swaging dies 51 to 54 press the hard core 2'through the soft chip body 1 ', so that the core 2'
Before the through-hole 201 of FIG. 1 fits into the hard wire 50, the soft chip body 1'deforms, that is, deforms in the long axis direction of the chip body 1 '. Therefore, in order to manufacture a contact chip having a desired shape, a soft chip body 1 '
Depending on the material, the material of the core 2'which is hard, and the desired shape of the contact tip 3 ', the swaging conditions such as the material of the die, the pressing force and the cycle of the pressing time and the pressing stop time are searched for each time. At present, the optimum value is selected. Therefore, it takes time to introduce the swaging device and select the conditions, and as a result, there is a problem that the contact tip 3'becomes expensive.

The present invention has been made in view of the above problems, and an object thereof is to manufacture it quickly and at low cost.
Moreover, it is an object of the present invention to provide a contact tip and a method of manufacturing the same, which can obtain a uniform welding result over a long period of time.

[0013]

The first invention is applied to an arc welding contact tip having a through hole for a consumable electrode in a shaft core. The characteristic is that the tip body member formed of a soft conductive metal and the tip end member for power supply, which is arranged on the tip side of the tip body member and formed of a hard copper alloy, are provided. That is, the end portion is cold-pressed in the long axis direction of the contact tip. A second invention is characterized in that, in the first invention, the tip member is formed of chrome copper or a chrome copper alloy. The third invention is applied to a method of manufacturing a contact tip for arc welding having a consumable electrode through hole in a shaft core. The characteristic is that the tip body member formed of a soft conductive metal and the tip end member for power supply which is disposed on the tip side of the tip body member and formed of a hard copper alloy are opposed to each other. And abutting the respective end portions of the tip body member and the tip member supported by the chuck in the long axis direction of the contact tip, and performing cold pressure welding while pressing the abutting end portions. Is. In a fourth aspect based on the third aspect, the ends of the tip body member and the tip member on the side opposite to the abutting ends are arranged in the longitudinal direction of the contact tip by the chuck or the attachment member of the chuck. It is characterized by being supported. In a fifth aspect based on the third or fourth aspect, at least one chuck of the pair of chucks supporting the tip body member and the tip member is
It is characterized in that a stopper mechanism is provided that is movably supported in the long axis direction of the contact tip and that restricts the pressing position of the chuck in the long axis direction. A sixth invention is characterized in that, in the third to fifth inventions, the tip member is made of chrome copper or a chrome copper alloy. A seventh invention is characterized in that, in the third to sixth inventions, an axial dent portion is formed at an end portion of the chip body member which is cold-pressed. An eighth invention is characterized in that, in the third to seventh inventions, an axial dent portion is formed at an end portion of the tip member that is cold-welded. A ninth invention is characterized in that, in the third to eighth inventions, the tip member is processed by a forging method before cold pressure welding. A tenth invention is characterized in that, in the third to ninth inventions, the chip body member is processed by a forging method or a cutting method before cold pressure welding. An eleventh invention is the method according to the third to ninth inventions, in which the tip member is processed by a forging method before cold-welding, and the tip body member is cold-welded and then forged or cut. It is characterized by being processed by the method.
A twelfth invention is characterized in that, in the third to eleventh inventions, after cold pressure welding, drilling is performed from the end portion side of the chip body member to the cold pressure welding portion of the electrode through hole. A thirteenth invention is characterized in that, in the third to eighth inventions, the tip member and the chip body member are processed after cold pressure welding.

[0014]

In the contact tip for arc welding and the method for manufacturing the same according to the present invention, the tip body member formed of a soft conductive metal and the tip body member of the tip body member are made of a hard copper alloy. The respective end portions of the formed tip member for power feeding are cold-welded in the long axis direction of the contact tip. That is, the tip member for power supply is formed of a hard copper alloy, and the chip body member is formed of a soft conductive metal, the tip member and the chip body member is a so-called foreign metal, at room temperature By the so-called cold pressure welding, in which the joining portion is strongly compressed and the joining surface is locally plastically deformed and pressure-welded, the tip member and the chip body member made of the dissimilar metals are securely fixed. As described above, the tip body member and the tip member made of different metals are securely and integrally fixed by cold pressure welding, and the tip member is kept in a high temperature state when performing arc welding operation using the contact tip. However, the fixed state between the tip body member and the tip member does not change, and therefore the electrode wire can be fed in a constant state from the start to the end of the arc welding operation. Of course, the cold welding device, which is an inexpensive equipment, can be used to manufacture contact tips for arc welding, but in combination with the small cross-sectional area for cold welding of the tip body and tip member, the cold welding device Since the tip body member and the tip member supported by the mechanically positioned chucks facing each other are cold-pressed, the tip body member and the tip member are coaxially and integrally fixed. In the contact tip for arc welding according to the present invention, the hardness of the cold-welded joint portion of the tip body and the tip member is increased due to the effect of work hardening by cold welding.
If the contact tip for arc welding is used in which the electrode wire is inserted through the shaft core, the life can be extended.

[0015]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a chip body member formed of a soft conductive metal. For example, the chip body member 1 is formed by rolling or forging including so-called swaging, and a through hole 101 and a mounting screw portion 102 are formed. , Parallel part 103 for spanner, tapered tip part 104, through hole 1
01, a tapered hole 105 for guiding the electrode wire and an axial recess 4 at the tip of the tip body member 1 are appropriately formed. Reference numeral 2 is a tip member made of a copper alloy harder than the chip body member 1 and having a through hole 201 and having good wear resistance and having good wear resistance. For example, the tip member 2 is a columnar member or a tubular member. In the through hole of
Desired outer diameter, eg 0.1 than the electrode wire diameter used
After inserting a hard wire having a large outer diameter of about mm to 0.3 mm and applying so-called swaging from the outside of the tip member 2, the through hole 201 of the tip member 2 is fitted to the hard wire, and then the tip is The member 2 is cut to a desired length. Alternatively, the above-described swaging process can be performed on the tubular tip member 2 that is preformed to a desired length. Figure 1 (A)
As shown in FIG. 1, the tip body member 1 and the tip member 2 are pressed at their respective ends and are cold-welded in the feeding direction of the electrode wire, that is, in the long axis direction of the contact tip 3 described later, as shown in FIG. They are integrally joined as shown in B).

For example, in FIGS. 4 to 6, the first chuck 12 is attached to the machine base 11 of the cold pressure welding apparatus 10. Reference numeral 13 denotes a movable base linearly movably supported by a guide member 14, and the movable base 13 is moved by an appropriate drive mechanism 15 so as to approach and separate from the first chuck 12. For example, a rotary shaft 17 rotatably supported by a fixed base 16 is rotated via a rotation transmission member 18 by a rotary drive machine 19 such as a fluid pressure rotary machine such as hydraulic pressure or compressed air or an electric motor. A ball screw 20 is formed on the rotary shaft 17,
The ball screw 20 is engaged with a ball nut 21 fixed to the moving table 13. The drive mechanism 15 for the movable table 13 is configured by the above 16 to 21. Reference numeral 22 denotes a second chuck attached to the moving table 13, and includes claws 121 of the first and second chucks 12 and 22,
221, ..., 221, 222, ... Can be expanded and contracted in the radial direction similarly to what is called a chuck of a machine tool. Reference numeral 23 is, for example, a stopper member that comes into contact with the movable table 13, and the position of the movable table 13 in the X ₁ direction is set by appropriately adjusting the position of the stopper member 23. Note that 125 and 225 are holes for bleeding air, and are for keeping the internal pressure of the tip body member 1 and the tip member 2 at the same pressure as the ambient pressure during cold pressure contact.

The tip body member 1 and the tip member 2 are fixed to the first and second chucks 12 and 22 of the cold pressure welding device 10 so as to be relatively opposed to each other, and the movable table 13 is moved by the drive mechanism 15. Is moved to the first chuck 12 side to press the tip member 2 held by the second chuck 22 against the chip body member 1, for example, and after a predetermined time, move the movable table 13 in the X ₂ direction. Complete cold welding. The drive mechanism 15 for the movable table 13 linearly movably supported by the guide member 14 is a well-known mechanism such as a cylinder lot and a cylinder of a so-called fluid pressure cylinder that is reciprocated by hydraulic pressure or compressed air. ,
To support the fixed base 16 and the movable base 13 relative to each other,
Alternatively, the rack and pinion of a so-called rack-pinion mechanism and the fixed base 16 and the movable base 13 can be relatively supported. Of course, in order to obtain a large driving force, a hydraulic drive mechanism, particularly a direct drive mechanism using a hydraulic cylinder is optimal. By the cold pressure welding, as shown in FIG. 1B, the tip body member 1 and the tip member 2 are welded to form the arc welding contact tip 3.

As for the form of cold pressure welding, the movable base 13 is brought into contact with the stopper member 23 whose position has been adjusted appropriately beforehand, and then the movable base 13 is separated in the X ₂ direction after a predetermined time. By doing so, when the dimensions of the tip body member 1 and the tip member 2, particularly the dimension in the major axis direction, are formed to be constant, it is possible to reliably obtain a constant pressure contact portion. On the other hand, without using the stopper member 23, the position of the moving base 13 when the ends of the tip body member 1 and the tip member 2 supported by the first and second chucks 12 and 22 are brought into contact with each other is used as a reference. After that, when it is detected by a suitable detecting means that the movable table 13 moved in the X ₁ direction by the drive mechanism 15 has moved by a predetermined amount, the movable table 13 is moved to the X direction.
If it is controlled so as to be separated in _two directions and complete the pressure contact,
Even if there are variations in the dimensions of the tip body member 1 and the tip member 2, especially the dimension in the major axis direction, it is possible to reliably obtain a pressure contact portion in a constant state.

Note that, regardless of the above, the pressing state of the movable table 13 can be set to the fully pushed state. That is, when the material of the tip body member 1 and the tip member 2 is specified as one of the combination numbers in Table 1 described later and the diameter of the applied electrode wire is specified as 1.0 mm, for example, the chip body Each part of the member 1 and the tip member 2 is also specified to have an appropriate size. However, when the size and material of each part of the chip body member 1 and the tip member 2 are specified in this way, the moving table 13 is positioned in the X ₁ direction. Even if cold pressing is performed while the chip body member 1 and the tip member 2 are pressed while being moved without restriction, if the pressing force at the time of cold welding is similar, the cold welding is performed. By repeating the process, the arc welding contact tip 3 in a desired state can be obtained. Therefore, the reciprocating moving base 13 can be driven by the linear drive mechanism having the above-mentioned driving machine, but the reciprocating moving base 13 can be driven by a manual drive mechanism, for example,
It can be operated by a toggle mechanism to obtain a pressing force.

By the way, the diameter of the consumable electrode wire used for arc welding is, for example, about 0.4 to 2.0 mm, and the outer diameter of the tip member 2 varies somewhat depending on the diameter of the applied electrode wire. The outer diameter of the tip member 2 is appropriately selected as a rough value of about 4 to 8 mm. For example, when the diameter of the electrode wire is 1.0 or 1.2 mm, the outer diameter of the tip member 2 is preferably about 5 to 6 mm.

Chip body member 1 in the cold pressure welding
Table 1 shows the combinations of the respective materials of the tip member 2 and the tip member 2.
In addition, as the copper shown in Table 1, oxygen-free copper, tough pitch copper, and phosphorus deoxidized copper are collectively referred to.

[0022]

[Table 1]

In the cold pressure welding, as described above, since the outer diameter of the tip member 2 is at most about 8 mm, Table 1
The combination numbers or items in are substantially 1 to 3
Cold welding could be performed in seconds.

By the way, the cold pressure welding device, as shown in FIG. 4 for example, drives the second chuck 22 supported by the moving base 13 linearly so as to face the first chuck 12 and linearly move the second chuck 22. Since it has an extremely simple structure constituted by, the equipment cost is lower than that of other welding devices.

For example, in the case of an electron beam welding apparatus, an electron beam generator, various focusing coil mechanisms for controlling the electron beam, a vacuum chamber and various electrical / mechanical control devices are required. The equipment cost becomes extremely expensive.

Further, in the case of a laser welding apparatus, a power supply for laser, a laser oscillator, a laser resonator, various optical transmission devices, a laser torch, and the like are required, so that the facility cost is extremely high, like the electron beam welding apparatus. It becomes expensive.

Further, when applying the arc welding apparatus,
The material of the contact tip which is the subject of the present invention is a non-ferrous metal and has a small cross-section.
The G arc welding equipment is applicable. In this case, a TIG welding power source, a TIG welding torch, cables for power feeding and grounding, etc. are required, and are therefore more expensive than the cold pressure welding device. Moreover, it is necessary to appropriately supplement the shielding gas for TIG welding and the TIG welding electrode as consumables while monitoring the respective conditions. If the welding is performed by the TIG arc welding apparatus, the manufacturing cost of the contact tip is As a result, the cost is higher than that in cold pressure welding.

Further, in the case of an electric resistance welding apparatus, not only is the apparatus expensive, but a heavy and bulky electric resistance welding power source is a hindrance to the work, and high voltage power receiving equipment is required. Therefore, if the welding is performed by the electric resistance welding device, the manufacturing cost of the contact tip is higher than that of the cold pressure welding.

In addition, about the combination numbers or the ones in Table 1, arc welding, laser welding, electron beam welding and friction welding by rotation / pressing were carried out. In any case, so-called practical commercialization is possible. No weld was obtained. That is, since the tip member for power feeding is made of a hard copper alloy and the chip body member is made of a soft conductive metal, the tip member made of a hard copper alloy was melted to an extent suitable for welding. In this case, the tip body member made of a soft conductive metal was melted too much, and these welded portions became so messy that it could not be put to practical use.

As described above, in the arc welding contact tip and the method of manufacturing the same according to the present invention, the tip body member formed of the soft conductive metal and the tip body member disposed on the tip side of the tip body member are made hard. The respective ends of the power supply tip member formed of the copper alloy are cold-welded in the long axis direction of the contact tip. Therefore, the tip body member made of a dissimilar metal and the tip member are securely fixed to each other by cold pressure welding.

Further, since the tip body member and the tip member which are mechanically positioned by the cold pressure welding device and supported by the chucks facing each other are cold-welded, the tip body member and the tip member are coaxially integrated. Stuck to.

Of course, when performing an arc welding operation using the contact tip for arc welding according to the present invention,
Even if the tip member becomes hot, the adhesion state between the tip body member and the tip member does not change.Therefore, supply power to the electrode wire in a constant state from the beginning to the end of the arc welding work. You can Therefore, uniform welding results can be obtained.

Further, in the arc welding contact tip according to the present invention, since the hardness of the cold welded joint portion of the tip body and the tip member is increased by the effect of work hardening by the cold weld, the shaft core portion is increased. If the contact tip for arc welding is used in which the electrode wire is inserted, the life can be extended.

Moreover, in the arc welding contact tip according to the present invention, since the cross-sectional area of the tip body member and the tip member to be cold-welded is small, the cold welding work between the tip body member and the tip member is extremely short. It is done in time, that is, quickly. Further, as described above, since the cold pressure welding device is a cheaper equipment than other welding devices, the arc welding contact tip can be manufactured at low cost.

The tip member is made of a hard copper alloy, and the tip body member is made of a conductive metal softer than that of the tip member. The tip member that supplies power while contacting the electrode wire is made of hard copper. Since it is an alloy, wear of the tip member is small, it is possible to use a contact tip for arc welding over time, and since the tip only needs to be formed in a columnar shape having a through hole for an electrode wire, it is possible to use hard copper. Even with alloys, the tip member can be relatively easily manufactured, and it is softer than the tip member that the conventionally required processing such as the screw part and the spanner hook part for attaching to the welding torch is performed. In addition, since the tip body member is made of an inexpensive conductive metal, the tip body member can be easily and inexpensively manufactured. Therefore, the arc welding contact as a whole. A-up can be quickly and inexpensively manufactured.

Further, if the tip member is made of chrome copper or a chrome copper alloy, the arc welding current can be efficiently supplied to the electrode wire and the abrasion resistance is good, so that it is used for arc welding over the years. Contact tips can be used.

By the way, in the cold pressure welding, if an axial dent portion is formed at the end portion of one or both of the tip body member and the tip member to be cold pressure welded, during cold pressure welding, The softened portion of the electrode wire on the side of the through hole is set in the recessed portion in the axial direction, and the occurrence of so-called burr due to cold pressure welding of the electrode wire to the through hole is reduced as much as possible. Therefore, it is conceivable that a contact tip that does not interfere with the feeding of the electrode wire can be manufactured without performing processing after cold pressure welding. Of course, it is preferable to provide the axial recessed portion in the chip body member made of a soft material that can be easily processed.

If the axial dents are provided on both the tip body member and the tip member, the swollen amount of the softened portion can be increased. It is possible to perform pressure welding.

Of course, the shape of the axial dent portion can be freely selected. For example, as shown in FIG. 2, a stepped axial dent portion 4 and a tapered axial dent portion 4 are provided. Can be provided at the ends of the tip body member 1 and the tip member 2, or can be provided at the ends of the tip body member 1 and the tip member 2.

Furthermore, if the tip member is processed by the forging method before cold pressure welding, the through hole of the tip member fits into the hard wire inserted through the shaft core of the tip member. In the case of forging, that is, swaging, the tip member made of a hard material can be directly pressed with a die, so that the tip member can be accurately formed with a through hole that conforms to the hard wire. Can be manufactured. In this way, the through hole of the tip member is accurately conformed to the hard wire and is work hardened, which increases wear resistance and the surface of this through hole becomes smooth, so that the contact friction resistance with the electrode wire is increased. Is reduced and the feedability of the electrode wire is improved.

Further, if the chip body member is processed by a forging method or an appropriate cutting method before cold pressure welding, the chip body member can be easily manufactured. Of course, if the tip body member is processed by the forging method, it is cheaper than the cutting method,
The chip body member can be manufactured quickly and easily.

Furthermore, the tip member may be processed by the forging method before cold welding, and the chip body member may be processed by the forging method or the cutting method after cold welding. For example, when processing the tip body member, the tip body member that is a hard material can be clamped, that is, the tip body member that is a soft material can be processed using the tip member as a reference, so the tip body member can be processed accurately. Can be done

When the tip member is processed by the forging method before cold welding, whether or not the through hole of the electrode wire of the chip body member is processed before and after the cold welding. After cold welding, as shown in FIG.
By performing drilling from the end portion side of the chip body member to the cold pressure contact portion of the electrode through hole, the electrode wire can be stably fed.

Of course, when the tip member and the chip body member are processed after cold pressure welding, the processing is more complicated than when cold welding is performed on each member, but the tip member is swaged. At times, since the tip member that is a hard material can be directly pressed by a die, it is possible to accurately and easily manufacture the tip member with a through hole that is accurately fitted to the hard wire, and it is a hard material. Since the tip body member, which is a soft material, can be machined with the tip member as a reference, the contact tip composed of the tip body member and the tip member can be machined accurately.

In the combination of the respective materials of the tip body member 1 and the tip member 2 shown in Table 1, the combination number; can be used over the years and is the most effective.
That is, the more empty the combination number is, the more effective it is.

Further, FIG. 7 is a diagram showing a modified example of FIG. 5, and the same components as those in FIG. 5 are designated by the same reference numerals, but the description thereof will be omitted. As shown in FIG.
For example, the attachment member 126 of the chuck 12 is provided with a through hole 127 in the shaft core portion thereof, and the through hole 20 of the tip member 2 is provided.
Cold welding is performed with a hard wire 25 having the same diameter as that of No. 1 inserted as shown in the drawing. Of course, hard wire 25 after cold pressure welding
Are removed. In this way, if the hard wire 25 is cold-welded in a state where it is inserted into at least the through hole 201 of the tip member 2, even if a softened portion due to cold pressure welding occurs on the through-hole side of the electrode wire, A passage is secured.

Further, as shown in FIGS. 5 and 7,
If both ends of the tip body member and the tip member on the side opposite to the abutting end are supported in the longitudinal direction of the contact tip by the chuck attachment member, the tip body member and the tip member are attached to the chuck. While contacting the member,
The abutting ends of the tip body member and the tip member are pressed against each other in the longitudinal direction. That is, even with a simple mechanism in which the restraining force of the chucks 12 and 22 is relatively small, the tip body member and the tip member can be securely cold-welded without sliding in the axial direction. Therefore, the chucks 12, 2
2 can be manufactured at low cost.

It should be noted that the support portions for restraining the respective end portions of the tip body member and the tip member in the X direction are provided with claws 121, 122, ..., 221, 22 of the chucks 12, 22, respectively.
2, ..., ... can be provided. Of course, a supporting portion for restraining the respective end portions of the chip body member and the tip member in the X direction can be selectively provided on either the chuck attachment member or the chuck.

Furthermore, the number of the claws of the first and second chucks 12 and 22 that can be expanded and contracted in the radial direction may be two or more, respectively, and the first and second chucks 12 and 2 can be expanded.
The second claw can be provided with notches or notches on the chuck surface in order to increase the gripping force.

For example, as shown in FIG. 5, when the diameter of the through hole 101 of the chip body member 1 is as large as possible than the diameter of the wire to be applied, for example, it is twice the diameter of the wire to be applied. In the above case, the tapered hole 105 for guiding the wire can be omitted.

Further, the cold pressure welding can be performed in the atmosphere, but if the cold pressure welding is performed in a vacuum or in an inert gas atmosphere, the joint portion can be protected in a desired state, so that the quality is higher. The joint can be obtained.

[0052]

As is apparent from the above description, the contact tip for arc welding and the method for manufacturing the same according to the present invention include a tip body member formed of a soft conductive metal and a tip side of the tip body member. And a tip body member made of a dissimilar metal, and a tip body member made of a dissimilar metal, because each end portion of the tip member for power supply formed of a hard copper alloy is cold-welded in the longitudinal direction of the contact tip. Is firmly fixed integrally by cold pressure welding, and further, mechanically positioned by the cold pressure welding device, and the tip body member and the tip member supported by the chucks facing each other are cold pressure welded, Since the tip body member and the tip member are integrally fixed coaxially and the cross-sectional area of the tip body member and the tip member subjected to cold pressure contact is small, the tip body member and the tip member are cold-welded. Contact work in an extremely short time, that is, quickly performed.

Of course, when performing arc welding work using the contact tip for arc welding according to the present invention,
Even if the tip member becomes hot, the adhesion state between the tip body member and the tip member does not change.Therefore, supply power to the electrode wire in a constant state from the beginning to the end of the arc welding work. You can Therefore, uniform welding results can be obtained.

Furthermore, in the arc welding contact tip according to the present invention, the hardness of the cold welded joint portion of the tip body and the tip member is increased by the effect of work hardening by the cold weld, so that the shaft core If the arc welding contact tip is used in which the electrode wire is inserted through the portion, the life can be extended.

In addition, as described above, the cold pressure welding apparatus is less expensive than other welding apparatuses, and the tip member is made of a hard copper alloy, and the tip body member is the tip. If it is made of a conductive metal that is softer than the member, the tip member that supplies power while contacting the electrode wire is a hard copper alloy, so there is little wear of the tip member and arc welding contact tips can be used over time. Since it can be used and the tip only needs to be formed in a column shape having a through hole for the electrode wire, the tip member can be relatively easily manufactured even if it is a hard copper alloy that is difficult to process. The tip body member made of conductive metal, which is softer and cheaper than the tip member, is capable of performing the processing that has been conventionally required such as the screw part for attaching to the welding torch and the wrench hook part. There therefore easily tip body member, and inexpensive to manufacture and therefore can be fabricated arc welding contact tip quickly and inexpensively as a whole.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention.

FIG. 2 is a partially sectional front view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a partial sectional front view showing a cold pressure welding apparatus suitable for the present invention.

5 is an enlarged vertical cross-sectional view of the chuck portion of FIG.

6 is a side view of FIG.

FIG. 7 is a diagram showing a main part of another embodiment of the present invention,
Enlarged view in vertical section corresponding to FIG.

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

1 Chip body member 2 Tip member 3 Contact tip for arc welding 4 Axial recess 101 Consumable Electrode Wire Through Hole 201 Consumable electrode wire through hole

Claims (13)

(57) [Claims] 1. A contact tip for arc welding having a through hole for a consumable electrode in a shaft core, wherein the tip body member is made of a soft conductive metal, and the tip body member is disposed on the tip side of the tip body member. A contact tip for arc welding in which each end of a tip member for power supply formed of a hard copper alloy is cold-welded in the longitudinal direction of the contact tip. 2. The contact tip for arc welding according to claim 1, wherein the tip member is made of chrome copper or a chrome copper alloy. 3. A method of manufacturing a contact tip for arc welding having a through hole for a consumable electrode in a shaft core, wherein the tip body member is made of a soft conductive metal, and the tip body member is disposed on the tip side. Is supported by a pair of chucks facing each other with a power feeding tip member formed of a hard copper alloy, and the ends of the tip body member and the tip member supported by the chuck are connected to the contact tip A method for manufacturing a contact tip for arc welding, which comprises axially butting and cold-pressing while pushing the butted end portion. 4. The tip body member and an end portion of the tip member opposite to the abutting end portions are supported in the longitudinal direction of the contact tip by the chuck or an attachment member of the chuck. 3. The method for manufacturing a contact tip for arc welding according to item 3. 5. A pair of chucks for supporting the tip body member and the tip member, at least one chuck being movably supported in the major axis direction of the contact tip, and a pressing position of the chuck in the major axis direction. A method of manufacturing a contact tip for arc welding according to claim 3 or 4, wherein a stopper mechanism for regulating the above is provided. 6. The method of manufacturing a contact tip for arc welding according to claim 3, wherein the tip member is made of chrome copper or a chrome copper alloy. 7. The method for manufacturing an arc welding contact tip according to claim 3, wherein an axial recess is formed at an end portion of the tip body member that is cold-pressed. 8. An end portion of the tip member, which is subjected to cold pressure welding,
The method for manufacturing a contact tip for arc welding according to any one of claims 3 to 7, wherein an axial recess is formed. 9. The method of manufacturing a contact tip for arc welding according to claim 3, wherein the tip member is processed by a forging method before cold welding. 10. The method for manufacturing a contact tip for arc welding according to claim 3, wherein the tip body member is processed by a forging method or a cutting method before cold pressure welding. 11. The tip member is processed by a forging method before cold pressure welding, and the tip body member is
The method for manufacturing a contact tip for arc welding according to claim 3, wherein the contact tip is processed by a forging method or a cutting method after performing cold pressure welding. 12. The contact tip for arc welding according to claim 3, wherein after the cold pressure welding, drilling from the end side of the tip body member to the cold pressure welding portion of the electrode through hole is performed. Production method. 13. The method of manufacturing a contact tip for arc welding according to claim 3, wherein the tip member and the tip body member are processed after the cold pressure welding.