JPH022553Y2 - - 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 remains in an extremely weakened state and is fed to the workpiece to some extent. 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 pinch the tip of the electrode with pliers or the like and forcibly pull the electrode in the _X1 direction to remove the inserted electrode portion. Moreover, the distance between the tip of the welding torch and the workpiece is usually 10 to 30 mm.
Since the diameter was selected to be about 1 mm, the torch had to be sufficiently retracted in order to pull the electrode in the _X1 direction, and the workability was not good. 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.
In the welding torch with the structure shown in Figs. 3 to 3, spatter enters the passage of the electrode wire and the sliding groove of the contact member through the appropriate opening, which improves the feedability of the electrode wire and the movability of the contact member. There was a risk that this would be hindered. 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 in the axial 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; 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 having air permeability, for example, a cylindrical braided wire made of copper or a copper-based alloy. . Further, the cylindrical body 11 consisting of 111 to 114 includes an intermediate member 92 and a flexible connecting member 93.
and is supported on the base side of the torch body 1 so as to cover the contact member 6. Further, the support member 4 is rotatably supported by the cylindrical body 11. For example, as shown in FIG.
is formed of an electrically insulating member, and the second cylindrical body 112 and the support member 4 are connected to the support pin 1 which faces each other.
It is rotationally supported by 2. Note that the support member 4 has opposing surfaces 121 and 12 of the support pin 12.
1 and is positioned in the Z direction. The torch body 1 is appropriately supported by a mounting member 14 via an electrically insulating member 13 disposed in the _X2 direction. Reference numeral 15 denotes a pressurizing means, for example, one end of a leaf spring 15 is supported by the torch body 1;
The other end of the support member 5 is in contact with an electrically insulating member 16 provided on the support member 4 . This pressurizing means 15 causes the contact member 6 to rotate around the support pin 12 at the fourth position.
It is biased counterclockwise in the figure. 17 is a stopper made of an electrically insulating member, and the contact member 6
prevents it from rotating in the Y ₂ direction more than necessary.
Note that the stopper 17 and the second cylindrical body 112 may be integrally formed, the support pin 12 may be formed of an electrically insulating member, or the first and second cylindrical bodies disposed before and after the second cylindrical body 112 may 3 cylindrical body 11
1 and 113 may each be formed of an electrically insulating member. Reference numeral 18 denotes a supply port for supplying shielding gas, and the shielding gas flowing in from this supply port 18 is supplied to the perforation hole 701 of the insulating member 7, the perforation hole 103 of the torch body 1, the space 22, and the perforation hole of the torch body 1. Connecting member 93 via 104
is guided to the vicinity of After this, the shielding gas can also flow in the support member 4 in the _X1 direction;
Since the power feeding member 5 is disposed at the end in the _X1 direction, the flow rate of the shielding gas flowing out from the vicinity of the passage of the electrode wire 19 to the welding position is not very large. On the other hand, since the connecting member 93 is formed into a cylindrical shape with air permeability, most of the shielding gas flows into the cylindrical body 11 through the connecting member 93, and after that, the shielding gas flows into the cylindrical body 11. along
It is ejected in the X ₁ direction. Reference numeral 910 denotes 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 the 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 arc start or during welding work, the electrode wire is fed to the workpiece to some extent as described above. In this case, in the torch according to the present invention, no problem occurs because the contact member 6 can be rotated as appropriate about the support pin 12 as described above. In addition, since a conventional wear-resistant guide member is not disposed closer to the object to be welded than the power supply position, the melting electrode does not swamp as in conventional torches.
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.

Further, the shielding gas ejected in the radial direction into the interior of the cylindrical body 11 through the connecting member 93 having air permeability is divided and rectified by the connecting member 93 to form a laminar flow. Since this laminar shielding gas flows out to the welding position, the welding area can be reliably shielded. Furthermore, since the connecting member 93 that laminarizes the shielding gas is located at a sufficient distance from the welding position, even if so-called spatter occurs during welding, this spatter will be removed from the connecting member 93.
There is almost no possibility that the shielding gas will fly to the third part, so even if welding is performed for a long time, there is no risk that the laminar flow of the shielding gas will be inhibited. Furthermore, during welding, power is supplied to the contact member 6 through the connecting member 93, so the connecting member 93 becomes high temperature, but since shielding gas flows between the connecting members 93 having air permeability, the connecting member 93 is is cooled to

8 and 9 are views showing other embodiments of the present invention, in which a power supply connection terminal 91 is connected to the torch body 1 on the side of the torch body 1 in the _X2 direction.
An intermediate member 92 is screwed to this power supply connection terminal 91. A hole 920 that fits around the outer periphery of the torch body 1 is provided approximately at the axial center of the intermediate member 92.
is drilled. Furthermore, a groove 921 extending in the axial direction is formed on the outside of the intermediate member 92, for example. The first cylindrical body 111 is provided with, for example, a positioning pin 21 that fits into the groove 921 of the intermediate member 92 . Therefore, the first cylindrical body 111 is positioned relative to the intermediate member 92 and is integrally supported by the torch body 1 by the cap nut 20. 151 is an electrically insulating bush screwed onto the first cylindrical body 111, 152 is an adjustment screw screwed onto the bush 151, and 153 is provided between the adjustment screw 152 and the support member 4. Rotate the adjustment screw 152 using the compressed spring to adjust the support pin 12.
After appropriately selecting the rotational force of the contact member 6 relative to the rotation force, the adjusting screw 152 is locked by the nut 154. Pressurizing means 1 by the above 151 to 154
5 are configured. The support member 4 and the second cylindrical body 112 are constructed in the same manner as shown in FIGS. 4 and 5.

In the case shown, the shielding gas is connected to the electrode wire 1.
9, this shielding gas is supplied from the end of the torch body 1 in the X ₂ direction.
It flows into the space 22 through the perforated hole 103 . In the illustrated case, an appropriate number of notches 922 are arranged in the axial direction on the inner circumferential surface of the perforation hole 920 of the intermediate member 92, and these notches 922 allow ventilation to be established between the space 22 and the perforated hole 920. The inside of the flexible connecting member 93 is communicated with the inside. For this reason, most of the shielding gas is radially injected into the cylindrical body 11 via the connecting member 93, and is then turned into a laminar flow and flows out to the welding position.

With the configuration shown in FIGS. 8 and 9, the contact state between the electrode wire 19 and the contact member 6 can be finely adjusted even during welding.

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, it is preferable to electrically insulate the consumable electrode wire 19 from the torch body 1 by coating or sheathing the outer periphery of the guide tube with an electrically insulating member. Furthermore, if a guide tube is provided, the electrode wire can be guided smoothly by replacing the guide tube with a new one as the guide tube wears out, and the guide tube, the guide member, and the power supply member can be attached and detached. If so, by replacing these with ones having suitable through holes for electrode wires, it is possible to realize welding torches that are compatible with electrode wires of various shapes. Despite this, the guide tube can be omitted as shown in FIG. Further, if the pressure means is disposed inside the contact member, it is advantageous to prevent spatter from adhering to the pressure means.
Note that if the torch body, support member, contact member, cylindrical body, etc. are appropriately forcibly cooled, each part of the torch will not become hot, making it easy to handle the torch and allowing the torch to be used for a long time. Furthermore, 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 carried out 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 by 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 pressurizing 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 attached to the support pin. By Z
Since the electrodes are positioned in the same direction, power is supplied in a steady state, and since the target position of the electrode is approximately constant, welding can be performed reliably. In addition, there is no risk that the replacement interval of the contact member will be longer and that the laminar flow of the shielding gas will be inhibited, so uniform welding can be performed over a long period of time. Furthermore, even if welding is performed for a long time, no problems will occur because the shielding gas flows between the connecting members having air permeability to cool the connecting members.

[Brief explanation of drawings]

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.
8 is a front sectional view showing another embodiment of the present invention, and FIG. 9 is a sectional view taken along the line - in FIG. 8. 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 with air permeability.

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 and urge the contact member toward the electrode wire side, and the power supply connection terminal disposed on the base side of the welding torch and the support member of the contact member are made to have air permeability. A cylindrical body is provided which is connected by a flexible connecting member and covers the flexible connecting member and the contact member from the base side of the welding torch, and opposing support pins are disposed on the cylindrical body. The contact member is tiltably supported on a plane including the axis of the electrode wire, and the contact member is restrained and supported in a direction substantially perpendicular to the plane, and the shielding gas passage extends from at least the connecting member portion into the cylindrical body. A welding torch made of 2. The welding torch according to claim 1, wherein the contact member is supported in contact with opposing surfaces of the support pin.