JPH022552Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding torch that uses a welding wire as a consumable electrode.

Generally, when consumable electrodes are used, power is supplied to the electrodes through contact members that come into contact with the electrodes, but since the contact members are subject to severe wear, there is a need for long-life electrodes. To deal with this, conventional
For example, those shown in FIGS. 1 and 2 have been proposed. That is, first and second wear-resistant guide members 3a and 3b are arranged in an electrode passage spaced apart from each other, and one of the electrode passages between the guide members 3a and 3b has a thickness equal to or less than the electrode width. A wear-resistant guide block 3c is provided, and the electrode is held between a contact member 6' having a thickness exceeding the electrode width and the guide block 3c, and the electrode is transmitted while supplying power to the electrode 19 via the contact member 6'. Welding was carried out with the help of supplies. For this reason, as shown in FIG. 2, even if the contact member 6' wears out, only a deep groove is created, and welding work can be carried out without any problem.

By the way, in arc welding work, a so-called stick phenomenon often occurs in which the tip of the electrode adheres to the workpiece at the time of starting the arc or during the welding work. In this case, the contact member 6' and the electrode 19
Resistive heat generation indicated by I ² R occurs between the contact position, that is, the power supply position and the welding position of the electrode tip, and the electrode becomes extremely soft. Note that, for example, although short-circuit current is detected and the feeding of the electrode is stopped as appropriate, it is unlikely that the feeding of the electrode is stopped immediately when the tip of the electrode is welded to the object to be welded. That is, even after the tip of the electrode is welded, the electrode is still being fed to the object to be welded to some extent in an extremely weakened state. In the above case, as shown in FIG. The extremely weakened electrode that is fed to the workpiece side from the position is connected to the second wear-resistant guide member 3b as shown by the two-dot chain line in FIG.
The electrode appears to be embedded in the hole, and feeding of the electrode is often stopped in this state. Normally, the electrode tip is automatically or manually cut off due to the occurrence of the stick phenomenon, and then restarted. However, as described above, since the electrode is embedded in the hole of the second wear-resistant guide member 3b, the electrode cannot be fed toward the workpiece. For this reason, for example, it was necessary to grasp the tip of the electrode with pliers or the like and forcibly pull the electrode in the _X1 direction to remove the swaged electrode portion. Moreover, the distance between the tip of the welding torch and the workpiece is usually 10~
Since it is selected to be about 30mm, the torch must be sufficiently retracted to pull the above electrode in the _X1 direction.
Workability was also poor. Furthermore, sintered porcelain, which has good wear resistance and heat resistance, is commonly used as guide members, but the mechanical strength of this sintered porcelain is not very high, and for this reason, as mentioned above, the sintered porcelain is When removing the electrode portion, the guide member may be damaged, which is not only economically disadvantageous, but also requires replacing the guide member, which is troublesome. Furthermore, in arc welding operations using consumable electrodes, particles of high-temperature molten metal, so-called spatter, are generally scattered, but with a welding torch having the structure shown in Figs. Since spatter enters the passage of the electrode wire and the sliding groove of the contact member through the opening, there is a risk that the feedability of the electrode wire and the movability of the contact member will be inhibited. In addition, in the above-mentioned conventional torch, it is possible to provide a cover to prevent spatter from entering the electrode wire passage and the sliding groove of the contact member, but in this case, a cover suitable for the narrow part may be manufactured. However, if a cover is provided, maintenance of the torch tip may be difficult and workability may be impaired.

An object of the present invention is to provide a welding torch that eliminates the above-mentioned conventional drawbacks.

The present invention will be described in detail below with reference to the illustrated embodiments. In FIGS. 4 to 7, 1 is a torch body with a through hole 101 bored in the axial center, and 2 is a wear-resistant guide tube detachably disposed in the through hole 101, for example, approximately at the axial center. A hole with a circular cross section is bored in the part. 3 has a through hole 30 approximately at the shaft center.
For example, this guide member 3 is screwed onto the end of the torch body 1 in the _X1 direction. 4 is a cylindrical support member that covers the guide member 3 that guides the electrode wire 19, and 5 is a power supply having a through hole 501 formed approximately in the axial center and a bottomed hole 502 opening in the X ₂ direction. For example, this power supply member 5 is a member for supporting member 4.
It is screwed onto the end in the _X1 direction. The support member 4 and the power supply member 5 constitute a contact member 6, and the contact member 6 is made of a highly conductive material, such as copper or a copper-based alloy. A flange portion 102 is provided on the base side of the torch body 1, and the flange portion 102 is held between a power supply connection terminal 91 and an intermediate member 92 via appropriately shaped insulating members 7 and 8. The support member 4 that supports the power supply member 5 and the intermediate member 92 are connected by a flexible connection member 93, for example, a cylindrical braided wire made of copper or copper alloy. Also 1
The cylindrical body 11 consisting of 11 to 114 is the intermediate member 9
2. It is supported on the base side of the torch body 1 so as to cover the flexible connecting member 93 and the contact member 6. Further, the support member 4 is rotatably supported by the cylindrical body 11. For example, as shown in FIG.
It is rotatably supported by support pins 12 that are opposed to each other. The support member 4 is positioned in the Z direction by contacting the opposing surfaces 121, 121 of the support pin 12. The torch body 1 is appropriately supported by a mounting member 14 via an electrically insulating member 13 disposed in the _X2 direction. 15 is a pressurizing means, for example, one end of the plate spring 15 is attached to the torch body 1.
The other side of the leaf spring 15 is in contact with an electrically insulating member 16 disposed on the support member 4 . The contact member 6 is urged counterclockwise in FIG. 4 with the support pin 12 as the center of rotation by the pressure means 15. A stopper 17 is made of an electrically insulating member and prevents the contact member 6 from rotating more than necessary in the _Y2 direction. Furthermore, stopper 17
and the second cylindrical body 112, the support pin 12 is formed of an electrically insulating member, or the first and third cylinders are arranged before and after the second cylindrical body 112. The shaped bodies 111 and 113 may each be formed of an electrically insulating member. 1
8 is a supply port for supplying shielding gas, 91
0 is a hole drilled in the power supply connection terminal 91, and the power supply connection terminal 91 and a power supply tool (not shown) are connected through this hole 910.

In the above configuration, after the electrode wire 19 is fed and reaches the perforation hole 501 of the power feeding member 5, the contact member 6
Welding is performed by feeding the electrode wire 19 while supplying power to the electrode wire 19 and causing the shielding gas to flow out from the supply port 18.

In this case, the contact member 6 is pressed by the pressure means 15.
Since it is biased in the _Y2 direction, the tip of the contact member 6 rotates counterclockwise in FIG. 4 about the support pin 12 and comes into contact with the electrode wire 19. That is, by a feeding device (not shown)
The electrode wire 19 fed in the _X1 direction is restrained by the guide member 3, and the tip member of the contact member 6,
That is, it is fed to the welding position while being in sliding contact with the power feeding member 5. Incidentally, as the welding progresses, the portion of the power feeding member 5 corresponding to the power feeding position gradually wears out, but the power feeding member 5 supported by the supporting member 4 does not press the pressure means 15.
Since the electrode wire 19 is biased in the _Y2 direction by the power supply member 5, the power supply member 5 and the electrode wire 19 are always in contact with each other regardless of the wear of the power supply member 5, so that power is supplied reliably.
Furthermore, as the welding progresses, the through hole 5 of the power supply member 5
01 gradually wears away in the _Y1 direction, a space is created above the through hole 501, that is, in the _Y2 direction, corresponding to the amount of wear. As this space becomes larger, spatter generated during arc welding may fly in the X ₂ direction, but during welding work the electrode wire 19
Since the sputter is always fed in the _X1 direction, the sputter is carried outward from the upper space of the through hole 501 along with the feeding of the electrode wire 19. Moreover, the through hole 50
Approximately semicircular part in Y1 direction of ₁ is electrode wire 19
Since power is supplied while being in constant sliding contact with the power supply section, spatter cannot enter the power supply section. In this way, there is no possibility that the spatters will adversely affect the power supply state, and since the guide member 3 is covered by the contact member 6, the spatters will not invade the feeding path of the electrode wire 19. In this way, spatter does not impede the feedability of the electrode wire or deteriorate the power supply condition, and even if the contact members are slightly worn, welding can be performed in the same state as the initial state, so welding can be performed for a long time. Uniform welding can be performed over the entire area, and therefore it is particularly effective for automatic welding.

Note that when the tip of the electrode wire is welded to the workpiece at the time of arc start or during welding work, the electrode wire is fed to the workpiece to some extent as described above. In this case, the torch according to the present invention is
As described above, since the contact member 6 can be rotated as appropriate about the support pin 12, no problem will occur. Also, on the side of the workpiece that is closer to the power supply position,
Since a wear-resistant guide member as in the conventional torch is not provided, there is no possibility that the melting electrode becomes swamped as in the conventional torch. Therefore, when the electrode wire is welded to the object to be welded, the welding operation can be restarted immediately by simply cutting the tip of the electrode wire appropriately.

In the above, the guide tube may be a substantially cylindrical body made of a wire having an appropriate shape, such as a round or rectangular cross section. Further, the cross-sectional shape of the electrode may be non-circular, for example, rectangular.

Furthermore, the outer periphery of the guide tube is coated or coated with an electrically insulating material to form a consumable electrode 1.
9 and the torch body 1 are preferably electrically insulated. Furthermore, if a guide tube is installed,
By replacing the guide tube with a new one as the guide tube wears out, the electrode wire can be guided smoothly.Moreover, if the guide tube, guide member, and power supply member are configured to be removable, they can be replaced as appropriate. By replacing the torch with one having a through hole for the electrode wire, it is possible to realize a welding torch that is compatible with electrode wires of various shapes. Despite this, the guide tube can be omitted. Further, if the pressure means is disposed inside the contact member, it is advantageous to prevent spatter from adhering to the pressure means. Furthermore, if a spring member is simply used as a pressurizing means, the welding torch can be made compact and inexpensive, but the cylindrical body 11
It is also possible to arrange a compression spring in the radial direction between the support member 4 and the cylindrical body 11, and to lock the end of the compression spring with an adjustment screw threaded onto the cylindrical body 11, so that the spring force can be adjusted. Note that if the torch body, support member, contact member, cylindrical body, etc. are forcibly cooled,
Since each part of the torch does not become hot, the torch is easy to handle and can be used for a long time. Furthermore, if the supporting member 4, that is, the connecting member 93 that connects the contact member 6 and the intermediate member 92 is a cylindrical flexible connecting member, the contact member 6
and a flexible connecting member 93, the torch body 1
Therefore, there is no risk of an electrical short circuit between the contact member 6 and the torch body 1 due to spatter. Note that since the electrode wire is restrained by the guide member, power is supplied in a steady state regardless of wear of the contact member, and the target position of the electrode wire is not changed. Further, since the support member 4 is positioned in the Z direction by contacting the opposing surfaces 121, 121 of the support pin 12, in conjunction with the arrangement of the guide member 3, power supply is performed in a steady state, and the electrode wire The target position will not change.

As described above, according to the present invention, since the contact member can be rotated as appropriate and the contact member with the through hole 501 is formed of a conductive material, the tip of the electrode is not covered. When welding to the object to be welded, there is no situation where the molten electrode becomes swamped as in the case of conventional methods. Therefore, during welding, welding can be restarted while feeding the electrode by simply cutting off the tip of the electrode. Good workability. Moreover, since power is supplied while the electrode wire and the contact member are constantly in sliding contact with each other by the pressurizing means, spatter cannot enter the power supply part, and the guide member that guides the electrode wire is covered with the contact member. Therefore, there is no possibility that spatters will enter the path of the electrode wire, and there is no possibility that spatters will impede the feeding performance of the electrode wire or deteriorate the power supply condition. Furthermore, since the contact member is urged toward the electrode wire by the pressure means, the electrode wire and the contact member are always in sliding contact regardless of wear of the contact member, and the contact member is supported by the support pin. Z
Since the electrodes are positioned in the same direction, power is supplied in a steady state, and the target position of the electrode is approximately constant, so welding can be performed reliably. Furthermore, the contact member can be replaced at longer intervals, allowing uniform welding to be carried out over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the main part showing a conventional example, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is an explanatory diagram of the state of Fig. 1, and Fig. 4 shows an embodiment of the present invention. The front sectional views and FIGS. 5 to 7 are respectively shown at - in FIG.
FIG. 1...Torch body, 3...Guide member, 4...
... Support member, 5 ... Power supply member, 6 ... Contact member, 11 ... Cylindrical body, 12 ... Support pin, 15 ...
. . . Pressure means, 19 . . . Electrode wire, 93 . . . Flexible connection member.

Claims (1)

[Claims for Utility Model Registration] 1. A contact member is constituted by a power supply member having a through hole for a consumable electrode wire and a support member that supports the power supply member, and a guide member for guiding the electrode wire is connected to the contact member. A pressurizing means is provided to cover the contact member with the member and urge the contact member toward the electrode wire, and the power supply connection terminal provided on the base side of the welding torch and the support member of the contact member are connected to each other by a flexible member. A cylindrical body is provided which is connected by a connecting member and covers the flexible connecting member and the contact member from the base side of the welding torch, and the electrode wire is connected by opposing support pins disposed on the cylindrical body. A welding torch in which a contact member is tiltably supported on a plane including an axis, and the contact member is restrained and supported in a direction substantially perpendicular to the plane. 2. The welding torch according to claim 1, wherein the contact member is supported in contact with opposing surfaces of the support pin.