JPS6245481A - Torch for welding - Google Patents

Abstract

PURPOSE:To stabilize the welding for preventing the spatter adhesion inside the shielded gas and to facilitate the reopening of the welding by bringing the feeding member at the tip of a one end supporting cylindrical conduction supporting member in contact with the tip of the electrode wire inside an insulating guide member. CONSTITUTION:An electrode wire 25 is inserted into the through hole 101 of the guide member 4 which is in the insulation 8, 9 state. The electricity of the connecting member 11 for feeding is passed to a flexible linking member 13, supporting member 5 and the feeding member 6 with globular tip. The contact member 7 supported by the pin 15 of an insulating cylindrical body 14 is rotated in the direction Y2 by a pressure means 19 and electrifies by coming in contact with a wire 25 always by a pierced hole 601. The shielded gas in cylindrical space 24 is passed through holes 22, 25 and spouted from the cylindrical space 26 of a gas nozzle 21 and the pierced hole 601. The electrode wire 25 is wrapped in the shielded gas equally with the directional direction being constant, prevents the spatters adhesion of the torch and perform a stabilized welding. The welding is re-opened easily by the cut of the projecting wire 25 in case of the electrode being deposited on the body to be worked.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to welding torches that use welding wire as a consumable electrode. BACKGROUND ART 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 no hope for long-life electrodes. In order to cope with this problem, the devices shown in FIGS. 1 to 3, for example, have been proposed in the past. That is, the first and second wear-resistant guide members 3a and 3b are arranged in the electrode passage apart from each other, and one of the electrode passages between the guide members 3a and 3b is provided with a thickness that is less than the electrode width. A wear-resistant guide block 3C is provided, and the electrode is sandwiched between the contact part off' having a thickness exceeding the electrode width and the guide block 3C, and the electrode is transmitted while supplying power to the electrode 25 via the contact member 7. Welding was carried out with the help of supplies. For this reason, even if the contact member 7 wears out, as shown in the second thickness, only a deep groove is formed, and welding work is carried out without any hindrance. By the way, in arc welding work, a so-called stick phenomenon often occurs in which the tip of the electrode touches the workpiece at f88 at the start of the arc or during welding work. In this case, resistance heat generation as indicated by 12R occurs between the abutting position of the contact member 7 and the electrode 25, that is, the current carrying position and the welding position of the electrode tip, and the electrode becomes extremely soft. For example, when detecting short circuit current. Although the electrode feeding is stopped as appropriate, the workpiece to be welded (
When the tip of the electrode is in the bath, it is unlikely that the feeding of the electrode will be stopped immediately.In other words, even after the tip of the electrode is welded, the electrode remains extremely weakened and continues toward the workpiece. In the above case, as shown in FIG. As shown by the two-dot chain line in FIG. 3, the extremely weakened electrode that is fed toward the workpiece from the contact position is connected to the second wear-resistant guide member as shown by the two-dot chain line in FIG. The electrode becomes stuck in the hole 3b, and the feeding of the electrode is often stopped in this state.The tip of the electrode is cut off automatically or manually due to the stick phenomenon, and then restarted. However, as mentioned above, the second wear-resistant guide member 3b
The electrode cannot be delivered in the proboscis direction because the electrode is present in the hole in the pinned state. For this reason, for example, it was necessary to grasp the tip of the electrode with a pencil/cheese and forcibly pull the electrode 10,000 times to remove the swamped electrode portion. Moreover, the distance between the tip of the 3-joint 1-chi and the workpiece is usually 1

[ ] - 30 degrees were selected, so in order to pull the electrode 10,000 times, the torch had to be sufficiently retracted, and the workability was not good. Sintered porcelain, which has good wear resistance and heat resistance, is commonly used as a rough guide member, but the mechanical strength of this sintered porcelain is too large, so it cannot be forcibly swaged as described above. 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. 5.Furthermore, in arc welding operations using consumable electrodes, particles of molten metal at daytime temperature, so-called spatter, are generally scattered. In this case, since spatter enters the passage of the electrode wire and the sliding groove of the contact member through an appropriate opening, there is a possibility that the feedability of the electrode wire and the movability of the contact member may be inhibited. In addition, in the above-mentioned conventional torch, it is possible to provide a cover to prevent spatter from entering the passage of the electrode wire and the sliding groove of the contact member. It is difficult to do this due to cracks and the manufacturing cost is high.Moreover, if a cover is provided, the maintenance of the torch tip is poor and there is a risk of impairing workability. When performing shielded gas arc welding using
It was difficult to form a passage for supplying shield gas to the l♂ contact section. Purpose of the Invention The present invention has been made in view of such problems, and includes:
The feedability of the electrode wire is less likely to be hindered by spatter, and a passage is provided to maintain a stable shielding gas flow. To provide a stone welding torch which has good workability and has a compact structure so that welding can be resumed. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to embodiments shown in the drawings. In Figures 4 to 7, 1 has a through hole 101 in the shaft core.
2 is a wear-resistant ID tube that is removably installed in the through hole 101, and has a hole with a circular cross section, for example, approximately in the axial center. Reference numeral 3 denotes a wear-resistant guide plotter having a through hole 301 formed approximately in the axial center. For example, this guide block 3
The end has been screwed in 10,000 times. The above torch body 1,
The guide tube 2S and the guide block 3 constitute a fixed guide member 4 for guiding the electrode wire 25. 5 is a cylindrical support member; 6 is a power feeding member having a through hole 601 formed approximately in the axial center and a bottomed hole 602 that opens X20,000 times; for example, this power feeding member 6 is It is screwed onto the end of the support member 5 of X10,000 times. The support member 5 and the power supply member 6 constitute a contact member 7, and the welding member 7 is made of a highly conductive material, such as copper or a copper-based alloy. The free end of the fixed guide member 4 is inserted inside this contact member 7 . A flange portion 102 is disposed on the base side of the torch body 1, and the flange portion 10 is connected to the power supply connecting member 11 and the intermediate member 12 via an appropriately shaped insulating member 8.9.
2 is being held. The support member 5 that supports the power supply member 6 and the intermediate member 12 are connected by a flexible connection member 13, for example, a cylindrical braided wire made of copper or a copper-based alloy. Further, the planar body 14 made up of 141 and 142 is supported on the base side of the torch body 1 so as to cover the base side of the intermediate member 12, the flexible connecting member 13, and the contact member 7. Further, the support member 5 is rotatably supported by the cylindrical body 14. For example, as shown in FIG. 5, the second dark body 142 is formed of an electrically insulating member, and the second cylindrical body 142 and the support member 5 are rotationally supported by opposing support pins 15. ing. The fl E support member 5 is the opposing surface portion 1 of the support pin 15.
51.151 and is positioned in the Z direction. 16 is an elastic airtight member, for example, a "0" ring. The torch body 1 is appropriately supported by a mounting member 18 via an electrically insulating member 17 disposed on the x20,000 times side. Reference numeral 19 denotes a pressurizing means, for example, one end of a temporary spring 191 is supported by the torch body 1 by a supporter 192, and the other end of this leaf spring 191 abuts against an electrically insulating member 193 disposed on the support member 5. A pressurizing means 19 is constructed. This is a gas nozzle detachably supported by the free end of the support member 5. For example, the gas nozzle 21 is composed of an electrically insulating nozzle 211 and a metal nozzle 212. The gas nozzle 2 and the contact member 7 are integrally moved to a fourth position by means of a pressurizing means 19 with the support pin as the rotation center.
It is biased counterclockwise in the figure. 22 is one or more holes provided in the guide member 4; 23 is the support member 5;
Two or more, for example, four, perforations are arranged in the radial direction at approximately equal intervals around the periphery of the electrode wire 25 through the perforations 22, 23 and the cylindrical space 24. It communicates with the internal space of the gas nozzle 21. Reference numeral 110 denotes a hole drilled in the power supply connecting pillow member 11, through which the power supply connecting member 11 and a power supply tool (not shown) are connected. In the above configuration 3, the magnetic pole wire 25 is fed, and after the electrode wire 25 reaches the perforated hole 601 of the power feeding member 6, power is fed to the contact member 7 via a power feeding tool (not shown), and the shielding gas is supplied to the gas nozzle. Welding is performed by feeding the electrode wire 25 while flowing out from the wire 21. In the illustrated case, the shielding gas is fed through the passage of the electrode wire 25 and flows out into the interior of the gas nozzle 2 through the perforation 22, the cylindrical space 24, and the perforation 23. In this case, since the contact member 7 is urged Y20,000 times by one pressure means, the tip of the contact member 7 is rotated once counterclockwise in FIG. 4 about the support pin 15. and comes into contact with the electrode wire 25. That is, the electrode wire 25 fed X10,000 times by a feeding device (not shown) is restrained by the guide block 3 and is brought into the welding position while slidingly contacting the tip member of the contact member 7, that is, the power feeding member 6. will be sent. Incidentally, as the welding progresses, the power feeding position portion of the power feeding member 6 gradually wears out, but since the power feeding member 6 supported by the supporting member 5 is urged in the Y2 direction by the pressurizing means 19, Regardless of the wear of the power supply member 6, the power supply member 6 and the electrode wire 25 are always in contact with each other, so that power supply is reliably performed in a steady state. Moreover, the gas nozzle 21 is supported by the free end of the contact member 7, and the gas nozzle 21 and the contact member 7 rotate integrally around the support pin 15, so that regardless of the wear of the power supply member 6, The cylindrical space 26 defined by the gas nozzle 2J and the contact member 7 is always maintained in a constant shape. In this way, the gas nozzle 21. ] If the cylindrical space 6 is maintained in a constant state during this period, the ejected flow of the shielding gas is also maintained constant, and uniform f-welding can be performed. 1i
Since the N pole wire 25 is restrained by a fixed guide member, especially the guide block 3, it is fed to a fixed position in the Y direction regardless of whether the power feeding member 6 is worn out. The gas nozzle 21 and the contact member 7 are rotated integrally Y20,000 times around the support pin 15, and the axis of the electrode wire 25 and the shield that flows out from the gas nozzle 21 are worn out. There is a concern that the axis of the gas ejected flow may coincide with γ(). However, in general, the gap between the power supply member 6 and the object to be bathed is selected to be about 10 to 30 sn, and the shield ejected from the gas nozzle 21 Since the shielding gas is an annular laminar flow and is jetted over a relatively wide area including the bath contact, the gas shielding effect is maintained even if the axis of the shielding gas jet flow does not match the axis of the electrode wire. does not substantially change.Furthermore, as the welding progresses, the through-hole 601 of the power supply member 6 is gradually worn Y10,000 times, so the through-hole 601 is worn down by an amount corresponding to the amount of wear.
A space is created above - that is, in the Y2 direction. As this space becomes larger, the spatter generated during arc welding can fly up to X20,000 times. However, during welding work, the electrode wire 25 is constantly fed at 25 and 1 is carried outward from the upper space of the through hole 601. Moreover, Y in the through hole 601
Since power is supplied while the approximately semicircular portion of the electrode wire 25 is constantly in sliding contact with the electrode wire 25, spatter cannot enter the power supply portion. Note that it is advantageous if at least the tip of the power feeding member 6 is formed into a spherical convex shape, since spatter is difficult to adhere to the spherical convex portion, and even if spatter does adhere, it is easily removed. It can also be In this way, there is no possibility that spatter will have an adverse effect on the power supply state, and since the guy 1'' member 4 is covered with the contact member 6, the planar body 14, etc., the spatter will not affect the feeding path of the electrode wire 25. In this way, spatter will not impede the feedability of the electrode wire or deteriorate the power supply condition (and even if the contact member is slightly worn, welding in the same state as in the initial state will not occur). Because it can be carried out evenly over a long period of time, -fX 7
G welding can be carried out, 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 bridge wire is fed to the workpiece to some extent as described above. In this case, the torch according to the invention. As described above, since the contact member 6 can be rotated as appropriate about the support pin 15, no problem will occur. Further, since a conventional wear-resistant guide member is not provided closer to the object to be welded than the power supply position, the melting electrode does not become swamped as in conventional torches. Therefore, when the electrode wire is welded to the object to be welded, the welding operation can be resumed immediately by simply cutting the tip of the electrode wire appropriately, resulting in good workability. Roughly, the support member 5 has opposing surfaces 15 of the support pin 15.
1.151 and is positioned in the Z direction, together with the arrangement of the guide block 3, power is supplied in a steady state. 8 to 11 are views showing other embodiments of the present invention, in which the power supply connection member 11 and the cylindrical body 14 are positioned relative to each other by a rotational positioning tool 271, for example, a key material. and is integrally supported by a fastener 281, for example a nut. Further, the intermediate member 12 and the cylindrical body 14 are positioned relative to each other by a rotational direction positioning tool 272, such as a key material, and are integrally supported by a fastening tool 2829, such as a cap nut. The torch body 1 is inserted through the approximate axis of the intermediate member 12 and is attached to the fastener 283, for example, the intermediate member 1.
It is supported integrally with the intermediate member 12 by an adapter that is screwed onto the end of the 2.times.20,000 times. 29 is a groove arranged on the outer periphery of the base side of the torch body 1;
This groove 29 communicates with grooves 291 and 291 extending in the axial direction provided on the outer circumference of the torch body 1, and communicates with the cylindrical space 24 formed by the torch body 1 and the support member 5. . Reference numeral 31 denotes a shielding gas connection port drilled in, for example, a power supply connection member], and this connection port 31 and a groove 29 provided on the outer periphery of the torch body 1 pass through an appropriate member. They are communicated by a drilled hole 32. Further, the support member 5 is rotatably supported by a support bottle 15 at the free end of the cylindrical body 14, that is, at the x10,000 end. In the illustrated case, the support bin 15 is preferably formed of an electrically insulating material. Numeral 192 is an electrically insulating bushing screwed onto the cylindrical body 14. Numeral 193 is an adjustment screw screwed onto the bushing 192. A compression spring 191 is inserted between the adjustment screw 193 and the support member 5.
is being cast. In this case, after the adjustment screw 193 is rotated and the rotation force of the contact member 7 relative to the support bin 15 is appropriately selected, the adjustment screw 193 is locked by the nut 194. 1) Airtight members 161, 162 and 162 as shown in the figure.
163, the shielding gas supplied from the connection port 31 flows through the perforation hole 32-groove 29, 291° cylindrical space 24, the perforation holes 23, 231, and the annular window 26 of the gas nozzle 21. After that, it is floated to the welding position. Of course, the groove 29 can also be provided on the inner circumference of the intermediate member 12. With the configuration shown in FIGS. 8 to 11, the contact state between the electrode wire 25 and the contact member 7 can be finely adjusted even during welding. In the above, the guide tube 2 may be formed into a substantially cylindrical body by a wire rod having an appropriate shape such as a round or rectangular cross section. Further, the cross-sectional shape of the electrode can be non-circular, for example, rectangular. Furthermore, it is preferable that the outer periphery of the guide tube 2 is coated or coated with an electrically insulating member to electrically insulate the consumable electrode wire 25 and the torch body 1. 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.
If the guide member S and the power supply member are configured to be detachable, it is possible to create a welding torch that is compatible with electrode wires of various shapes by replacing them with ones that have appropriate through holes for electrode wires. It can be realized. Despite this, the guide tube can be omitted as shown in FIG. If the torch body, supporting member, contact member, cylindrical body, etc. are appropriately forcibly cooled, each part of the torch will not become hot, making it easier to handle the torch and allowing it to be used for a long time. . In addition, a fixed guide member 4, a contact member 7, and a gas nozzle 2
1 is supported substantially coaxially, the tip of the welding torch becomes compact and can be applied to narrow welded parts. As described above, according to the present invention, the contact member and the gas nozzle, which rotate about the support bin with respect to the fixed guide member, are integrally supported, so that the power supply member can be used during welding work. Even after wear, the ejected flow of shielding gas against the welding part produces the same gas shielding effect as in the initial state, and therefore uniform welding can be performed. Further, since the fixed guide member, the contact member, and the gas nozzle are arranged substantially coaxially, the welding torch, especially the tip end, can be made compact, and therefore it can be applied to narrow areas to be welded. Furthermore, since spatter does not enter the feeding of one electrode wire, there is no risk of impeding the feeding performance of the electrode wire, and power is fed while the electrode wire and the contact member are constantly in sliding contact due to the pressurizing means. In addition to this, the contact member is positioned in two directions by the support pin, so power is supplied in a steady state, and the aiming position of the electrode is approximately constant, so welding can be performed at the start. . In addition to the fact that the contact member can be rotated as appropriate, the contact member with the through hole 601 is made of a four-electrode material, so that the tip of the electrode can be welded to the welding proboscis. In some cases, there is no situation where the melting electrode becomes swamped as in the case of conventional methods, and therefore, during welding, the electrode tip can be simply cut off and the 3rd contact can be restarted while feeding the electrode, improving work efficiency. good.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a main part showing a conventional example, Fig. 2 is a sectional view taken along the line n-11 in Fig. 1, and Fig. 3 is an explanatory diagram of the state of Fig. 1.
FIG. 4 is a front sectional view showing an embodiment of the present invention, and FIGS. 5 to 7 are lines v-v, VI-VI and
8 is a front sectional view showing another embodiment of the present invention, and FIGS. 9 to 11 are IX-IX in FIG. 8, respectively.
Green: XX-X line S and Maise-XI line sectional views. l...Torch body, 4...Guide member, 5...
Supporting member, 6... Power feeding part resistance, 7... Contact member, 1
3... Flexible connection member, 14... Cylindrical body, 15.
... Support pin, 19... Pressure means, 21... Gas nozzle, 25... Electrode wire Fig. 8 C −−1−3;−−−゛°zWords Figure 9
Figure 10 Figure 11

Claims (1)

[Claims] 1. A fixed guide for guiding the electrode wire, in which a contact member is constituted by a power supply member having a through hole for a consumable electrode wire and a cylindrical support member that supports the power supply member. Inserting the free end of the member into the contact member and connecting the power supply connecting member disposed on the base side of the welding torch and the support member of the contact member with a flexible connecting member, A cylindrical body is provided that covers the flexible connecting member and the base side of the contact member from the base side of the welding torch, and the axial line of the electrode wire is included by opposing support pins arranged on the cylindrical body. A contact member is tiltably supported on a plane, and the contact member is restrained and supported in a direction substantially perpendicular to the plane, a gas nozzle is detachably supported at the free end of the support member of the contact member, and a welding torch is attached. A welding torch comprising a shielding gas passage extending from the base side to the inside of the gas nozzle, and a pressurizing means for integrally urging the contact member and the gas nozzle toward the electrode wire side. 2. The welding torch according to claim 1, wherein the contact member is supported by coming into contact with opposing surfaces of the support pin. 3. The welding torch according to claim 1 or 2, wherein the power feeding member of the contact member has at least a tip portion formed in a spherical convex shape.