JPH031109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a welding torch suitable for a welding method that uses a welding electrode and adds filler wire from the outside.

In this type of welding method, it is desirable that the feeding position of the filler metal wire be able to rotate freely around the axis of the welding electrode due to changes in the welding direction and welding posture. . For this reason, conventional welding torches have been proposed, for example, structures shown in FIGS. 1 to 3. That is, the illustrated welding torch 1' is a non-consumable electrode type welding torch, in which a filler wire feed guide 7' is disposed on the side of the torch body 2', and is integrally connected to the feed guide 7'. First and second holders 50 and 51 are disposed movably in the axial direction with respect to the torch body 2'.
Note that the feeding guide 7' is a spring 52 disposed between the first holder 50 and the torch main body 2'.
is biased in the _X1 direction. For this reason, the feeding guide 7' and the first and second holders 50, 5
1 means X. The second holder 51 is biased in the ₁ direction.
comes into contact with the torch body 2' and the feed guide 7' etc.
positioned relative to the direction. On the other hand, for example, radial grooves 53, 53, . . . are formed at the end of the torch main body ₂ ' in the A feed guide 7' is positioned around the axis of the welding electrode 5. To change the position of the feed guide, move the feed guide, etc. in the X ₂ direction against the spring to release the engagement between the groove and the protrusion, and then move the feed guide, etc. in the appropriate direction. When the feed guide and the like are rotated to release the restraint, the groove and the protrusion are engaged again and the feed guide and the like are positioned.

By the way, when welding is carried out using a non-consumable electrode welding torch, for example, filler wire may not be used or the filler wire may be manually inserted into the welding area. For example, a welding torch with the structure shown in Fig. 4 is commonly used, but compared to this type of general-purpose torch, the torches shown in Figs. 1 to 3 have a complicated structure, so assembly work is difficult. This method is troublesome, and has the drawback of increasing production costs because the main parts of general-purpose torches cannot be shared.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for assembling a welding torch that eliminates the above-mentioned conventional drawbacks.

The present invention will be explained in detail below with reference to the illustrated embodiments. 5 to 9 are diagrams showing preferred embodiments of a method for assembling a non-consumable electrode welding torch equipped with a mechanism for adding filler wire from the outside, in which 1 is a general-purpose non-consumable welding torch. A consumable electrode type welding torch, for example, this welding torch 1 has a torch body 2.
, a torch cap 3 screwed onto the rear part of the torch body 2, a gas nozzle 4 supported on the front part of the torch body 2, and a non-consumable electrode 5. 6 is a filler metal wire, 7 is a feed guide for the filler metal wire, and this feed guide 7 is connected to the first holder 8.
Supported by A second holder 9 is supported by the torch body 2, and the filler metal wire feed guide 7 is supported by the torch body through the first and second holders 8, 9. In the illustrated case, the second holder 9 is provided with a cylindrical portion 901 extending in the _X2 direction, and an inner tube 902 and an outer tube 903 of this cylindrical portion 901 are formed concentrically. ing. Reference numeral 11 denotes an assembly gauge having a first engaging part 111 that removably engages with the rear part of the torch main body 2, and a second engaging part 112 that engages with a second holder. Second engaging portion 111,1
12 is formed into a threaded portion and a columnar portion having a circular cross section.

In the above, the torch cap 3 is removed from the torch body 2, and the assembly gauge 11 is screwed onto the rear part of the torch body 2 instead. After that, as shown in FIG. 6, the second engaging part 112 of the assembly gauge 11 and the inner cylinder 902 of the second holder 9 are engaged, and in this state, the second holder 9 is attached to the torch body. It is integrally supported by 2. After the second holder 9 is integrally supported by the torch main body 2, as shown in FIG. and the first holder 8 is fastened by the fastener 10 at an appropriate position relative to the torch body 2.
Of course, after the second holder 9 is integrally supported by the torch body 2, the assembly gauge 11 is removed and the torch cap 3 is screwed on again. Holder 8
This may be done before or after the installation operation. Also, the fastener 1
The positioning of the first holder 8 according to 0 can be selected in the final stage. Furthermore, assembly gauge 1
The second engaging portion 112 of the first embodiment may have a circular cross section, and the outer surface of the engaging portion may be suitably cut out in the axial direction, as shown in FIG. 8, for example. In this case, if the notch is provided near the end in the _X2 direction, the assembly gauge can be easily rotated.

Further, the present invention can be applied to a non-consumable electrode type welding torch. In this case, consumable electrode type welding torches generally have a so-called flexible conduit connector screwed onto the rear part of the torch body to guide the consumable electrode wire, which is the welding electrode. The first engaging portion 111 of the gauge 11 may be screwed on. In addition, in consideration of the case where the above-mentioned mechanism that can add filler metal wire from outside during welding using a consumable electrode wire is installed, as shown in Fig. 10, an assembly gauge is installed. A through hole 113 can be bored approximately at the axial center of the shaft 11, and an axial slit 114 can be provided that communicates with the through hole 113 and the outside. In this way, the assembly gauge can be attached and detached even if the consumable electrode wire is inserted into the torch body. In this case, it goes without saying that an axial slit communicating between the inside and outside of the inner tube 902 of the second holder 9 is provided.

11 and 12 are main part views of a consumable electrode type welding torch showing another embodiment suitable for the present invention, in which a connector 13 of a flexible conduit 12 is shown.
A case will be described in which the torch body 2 is rotatably supported around the axis of the torch body 2. That is, a groove in the circumferential direction is formed on the outer periphery of the end of the connecting tool 13 in the _X1 direction, and the position of the connecting tool 13 remains unchanged in the X direction due to the locking tool 14 that engages with this groove. , is rotatably supported around the axis of the torch body 1. In this case, the assembly gauge 11 is the torch body 2.
A first engaging portion 111 having a circular cross section that engages with the hole of
and a second engaging portion 112 having a regular hexagonal cross section, for example.
A through hole 113 is bored in the axial core portion, and an axial slit 114 is provided that communicates between the through hole 113 and the outside. Note that a locking tool 14 is provided at the end of the first engaging portion 111 in the _X1 direction.
A notch is formed that comes into contact with the. A cylindrical portion 901 of the second holder 9 is formed by an inner tube 902 having a regular hexagonal cross section and an outer tube 903 having a similar shape, which engages with the second engaging portion 112 of the assembly gauge 11. Also, the cylindrical portion 90 of the second holder 9
An axial slit 904 is provided that communicates with the inner cylinder 902 of No. 1 and the outside. first holder 8
The engagement hole 801 of the outer cylinder 903 of the second holder 9
An axial slit 8 is formed to have a regular hexagonal cross section and communicates with the engagement hole 801 and the outside.
02 is installed.

In the above description, it is assumed that a consumable electrode wire serving as a welding electrode is inserted through the welding torch 1 so as to be located at the tip thereof.

First, the locking tool 14 is loosened to remove the connecting tool 13 and the flexible conduit 12 from the torch body 2, and then the consumable electrode wire is inserted through the slits 904 and 114 into the through hole 113 of the assembly gauge 11.
Insert inside. Next, the cylindrical part 9 of the second holder 9
01 and the second engaging part 112 of the assembly gauge 11 are engaged, the first engaging part 111 of the assembly gauge 11 is engaged with the rear part of the torch body 2, and the locking tool 14 is engaged. Fix the assembly gauge 11. In this state, the second holder 9 and the torch main body 2 are integrally supported. After this, replacing the assembly gauge 11 and the connecting tool 13 and attaching the first holder 8 to the second holder 9 are the same as in the previous case.

In the illustrated case, a flange is provided at the end of the assembly gauge 11 in the _X2 direction, which is advantageous because the position of the second holder can be reliably determined when the assembly gauge 11 is used. However, the above flange can be omitted. Further, if the engaging portions of the first and second holders are made to have a regular polygonal cross section, the first holder 8 can be connected to the second holder 9.
Although a change in the angle of The positioning of the second holder is performed reliably. Furthermore, if the engaging portions of the first and second holders are made to have a regular polygonal cross section, when the angle of the first holder 8 is changed, the first and second holders
The first holder must be moved in the _X2 direction to disengage the holders, but if the first and second engaging portions are made circular in cross section, the fastener 10 can be simply loosened. The first holder, ie the feed guide for the filler metal wire, can be rotated by a desired amount. Of course, the present invention is not limited to the above embodiment, and various modifications can be made by appropriately combining the parts of the above embodiment or replacing each part with an equivalent member. Also the first
Between the holder 8 and the feed guide 7, a member that can be moved to adjust the position in the axial direction of the welding torch with respect to the first holder may be disposed, or the welding torch and filler material may be moved relative to the first holder. A member may be provided that allows the feeding guide to rotate freely in a plane that includes the axis of each wire.

Note that the removable assembly gauge described above can also be, for example, a torch cap. That is, the second holder is supported by the torch body with the inner cylinder of the second holder loosely fitted to the outer circumference of the torch cap, and the first holder rotates around the outer cylinder of the second holder. It can be configured to be located as follows. In this case, to prevent workers from getting an electric shock during welding, an electrical insulator with relatively low mechanical strength is generally applied to the outer surface of the torch body and parts connected to the torch body, such as the torch cap. However, as mentioned above,
If the first holder supporting the feed guide for the filler metal wire is supported by the cylindrical part of the second holder made of a steel material, for example, which has high mechanical strength,
There is no damage to the torch during rotational position adjustment, so it has good longevity as a welding torch.

As described above, according to the present invention, first, the first welding electrode coaxial with the welding electrode is removably engaged with the rear part of the torch body.
An assembly gauge having an engaging part and a second engaging part having an outer peripheral surface coaxial with the first engaging part is attached to the rear part of the torch body, and a coaxial inner cylinder and a second engaging part are attached to the second holder. In order to support the second holder on the torch body in a state in which an outer cylinder is provided and the inner cylinder and the second engaging portion of the assembly gauge are fitted, the second holder supported on the torch body is provided with an outer cylinder. The outer cylinder of the holder is coaxial with the welding electrode. Furthermore, in order to support the first holder with respect to the second holder with the engagement hole drilled in the first holder fitted into the outer cylinder of the second holder, the first holder The welding electrode is supported by the second holder with its axis centered on the welding electrode. Therefore, the feed guide for the filler metal wire supported by the torch body via the first and second holders rotates around the axis of the welding electrode, and therefore the rotation of the feed guide with respect to the torch body rotates. Even if the position is changed appropriately, the relative relationship between the welding electrode and the filler metal wire remains unchanged, and by adding appropriate parts to a so-called general-purpose welding torch that does not use a filler metal wire. Since it is possible to realize a welding torch that uses filler metal wire, it is possible to manufacture a welding torch for this type of welding method at a low cost, and because it uses an assembly gauge, it is extremely quick and easy to assemble the welding torch. and can be executed with high precision.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing a conventional example, Figs. 2 and 3 are perspective views and front sectional views showing the main parts of Fig. 1, respectively, and Fig. 4 is a welding torch commonly used in the past. 5 is a front view showing a welding torch assembled by the method of the present invention,
FIGS. 6 and 7 are partial sectional front views showing the assembly process of the welding torch shown in FIG. 5, and FIGS. 8 and 9 are -
10 is a perspective view showing a modification of the main part of FIG. 6, FIG. 11 is a diagram showing the process of assembling a welding torch by the method of the present invention, and FIG. Figure 12 corresponds to Figure 11.
It is a figure which shows the principal part of a figure, and is a view taken along the line XII-XII. 1... Welding torch, 2... Torch body, 7...
Feed guide for filler metal wire, 8...first holder, 9...second holder, 11...gauge for assembly, 111...first engagement portion, 112...second engagement Department.

Claims (1)

[Claims] 1. A filler metal wire feed guide having a feed passage that intersects with the axis of the welding electrode is supported by at least first and second holders, and supported by the first holder and the torch body. In a method for assembling a welding torch in which the feeding guide rotates around the axis of the welding electrode by adjusting its position with a second holder, the welding torch removably engages with the rear part of the torch body. An assembly gauge having a first engaging part coaxial with the electrode and a second engaging part having an outer peripheral surface coaxial with the first engaging part is attached to the rear part of the torch body, and a second holder is attached. A coaxial inner cylinder and an outer cylinder are provided, and the second holder is supported on the torch body with the inner cylinder and the second engaging part of the assembly gauge fitted together, and the second holder is attached to the first holder. A method for assembling a welding torch, in which a first holder is supported with respect to a second holder with a bored engagement hole fitted into an outer cylinder of the second holder. 2. The welding torch assembly method according to claim 1, wherein the first engaging portion is a threaded portion.