JPS62263866A - Welding tool - Google Patents

Abstract

PURPOSE:To hold the gap located between the tip of the W electrode for welding and a base metal constantly and to perform a stabilized welding by storing a TIG welding equipment into the case having the holding face abutting to the welding base metal and a welding window and moving the welding tool protecting face of the case on the weld line by bringing it into contact with the base metal. CONSTITUTION:The W made electrode 2 of a TIG welding tool is fixed to the front end part of a copper made collet body 14 in a hollow shaft shape and fitted into the centering stone 15 made of ceramics having the oblong hole 15a extending to the right and left inside a shield cap 9. It is stored into the welding tool case 1 electrically insulated, a welding window 12 is provided on the welding tool protecting face 9a of the shield cap 9 and moved on a weld line 23a by abutting to the surface of the base metal 23 to be welded. The protecting face of the shield cap 9, namely the gap between the face of the base metal 23 and the tip of the W electrode 2 is held constant always, the arc length of between the tip of the electrode 2 and the weld line 23a of the base metal 23 is stabilized in a certain length always as well and a stable welding can be performed only by moving the welding tool case 1 by sliding on the weld line even in case of an unskilled person.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a welding tool mainly used as a TIG welding torch.

(Prior Art) In a conventional TIG welding torch, an electrode rod is generally placed in a torch case having a nozzle hole formed at the tip for spouting inert gas, and an electrode rod is positioned at the center of the nozzle hole and slightly away from the nozzle hole. Usually, it is fixedly supported in a protruding state.

According to such a torch, by holding the torch in the hand and moving it along the welding line in position B with the distance between the tip of the electrode rod and the surface of the base metal maintained so as to obtain the best arc length, the arc can be created. It is possible to fusion weld the weld line portion of the base metal with the concentrated heat generated by the welding process.

(Problem to be solved by the invention) However, since the work of moving the torch while ensuring the best arc length is done manually, it requires not only unskilled people but also highly experienced people. However, it is extremely basic and requires a very high level of skill from the operator. Moreover, intense light from the arc is emitted between the torch and the base material.
4, workers are forced to wear protective masks to protect their eyes, which is extremely troublesome. In particular, in the case of unskilled workers, along with wearing such a protective mask,
The distance between the electrode rod and the base material cannot be properly adjusted, and there is a strong possibility that the electrode rod may be short-circuited to the base material.

Furthermore, when the work is carried out outdoors, the arc and the encapsulated gas ejected from the nozzle hole are likely to be affected by wind, which may impede a good fusion welding effect.

It is an object of the present invention to provide a welding tool that solves all of these problems and allows even unskilled personnel to perform welding work extremely easily and satisfactorily.

(Means for Solving the Problems) In order to achieve the above object, the welding tool of the present invention has a welding tool holding surface in the shape of a vine attached to the base metal at the tip and a long hole opening in the welding tool holding surface. a welding tool case having a shaped welding window;
A 1ri rod housed in the welding tool case in an electrically insulated state from the welding tool case and the electrode rod are placed in the welding window while maintaining a constant distance between the tip of the rod and the welding tool holding surface. supporting means that directly face each other and support the electrode rod so as to be freely movable in the longitudinal direction; a driving means that drives the electrode rod to travel; a control means that controls energization and driving of the electrode rod on and off; and a distal end portion of the welding tool case. and a gas supply means for supplying welding gas toward the welding window within the tip of the welding tool case.

(Operation) The welding tool, that is, the welding tool case, is artificially held with the welding window directly facing the welding line and the welding tool holding surface attached to the base metal surface, and then the electrode rod is driven to travel. Then, the arc emitted from the electrode rod welds the base material over a length corresponding to the travel distance of the electrode rod.

At this time, if the welding tool case is held with the welding tool holding surface attached to the base metal surface, the electrode rod will move as the tip of the electrode moves a certain distance from the welding holding surface. The distance between the tip of the rod and the weld line portion on the surface of the base metal is maintained constant. Therefore, for example, in TIG welding, the arc length can be kept constant, resulting in good welding.

Since this kind of artificial holding of the welding tool case is carried out with the welding tool holding surface attached to the base metal surface, no skill is required, and even an unskilled person can easily and reliably hold the welding tool case. can be done. Further, the attachment of the welding tool holding surface to the surface of the base material can also serve as a clamp for the base material, making it possible to reduce the number of clamp members.

Furthermore, cooling of the tip of the welding tool case produces a thermal pinch effect, and the base metal is effectively engulfed by the arc. Furthermore, cooling the tip of the welding tool case also cools the base material with which the tip comes into contact, thereby preventing welding distortion as much as possible.

Moreover, since the welding action is performed in the area covered by the welding tool case, the arc and welding gas are hardly adversely affected by wind.

Additionally, the arc light does not leak outside due to the welding tool case, and the worker does not need to wear a mask. Similarly, high frequencies do not leak, and noise generation is extremely low.

(The following is a blank space) (Example) Hereinafter, the structure of the present invention will be described based on the embodiment shown in FIGS. 1 to 7. This embodiment relates to an example in which the present invention is applied to a TIG welding torch.

1 and 2 are cross-sectional views showing the internal structure of the welding tool, and FIG. 3 is a perspective view showing the external shape of the welding tool. is welding tool case 1
an electrode rod 2 which is a tungsten electrode; a supporting means 3 for supporting the electrode rod 2 in the case 1; a driving means 4 for driving the electrode rod 2 to travel; and a control means 5 for controlling the energization and driving of the electrode rod 2. A cooling means 6 for cooling the tip of the case 1, and a gas supply means 7 for supplying a welding gas, that is, an inert encapsulating gas such as argon, into the tip of the case 1. In addition, in the following description, up and down or right and left mean the top and bottom or left and right in FIG. 4 or FIG. 5, and front and rear shall mean the left and right in FIG. 1 or 2.

As shown in FIGS. 1 to 3, the welding tool case 1 includes a shield cap 9 at the front end of a hollow rectangular columnar case body 8.
is removably attached using a suitable fixture (not shown), and a handle 11 is fixed to the rear end.

The case body 8 and handle 11 are made of synthetic resin,
The shield cap 9 is made of copper.

The front end of the shield cap 9 has an inclined surface 9b on its upper and lower surfaces.
, 9b, and the front surface is a rectangular flat surface elongated in the left-right direction.
It is said to be a. A long hole-shaped welding window 12 that opens along the longitudinal direction of the welding tool holding surface 9a is bored in the front wall of the shield cap 9.
Gas permeable grooves 13, 13 are recessed to be located above and extend from the left and right ends of the shield cap 9 to the center of the left and right ends of the welding window 12.

Note that positioning pins 9c and positioning holes 8a into which the pins fit are provided on the abutting surfaces of the case body 8 and the shield cap 9 to ensure accurate abutment between the two pins 8 and 9. This is a clever idea.

Further, the space between the case body 8 and the shield cap 9 is kept airtight by a gasket 1o made of polytetrafluoroethylene.

The support means 3 inserts and fixes the electrode rod 2 into the front end of a hollow shaft-shaped collet body 14 made of copper, and supports this collet body 14 within the welding tool case 1 so that it can move left and right. That is, a ceramic centering stone 15 having a long hole 15a extending in the left-right direction is fitted and fixed in the shield camp 9, and the front end portion of the collet body 14 is slidable left and right into the long hole 15a of the centering stone 15. It is inserted and supported. In addition, the guide rail 1 fixed to the lower part of the case body 8
A collet slat 17 made of ceramic is fitted into the through hole 1 of the collet slat 17 so as to be slidable left and right.
A portion near the rear end of the 7 a lin collet body 14 is inserted and supported so as to be slidable back and forth. Further, on the upper wall 8b of the case body 8, there is provided a protrusion 1 extending in the left-right direction and having a cam surface 18a formed on the front surface parallel to the welding tool holding surface 9a.
8 is installed vertically, collet slat 17 and collet body 1
Spring receiver 1 for a roll pin etc. fixed to the rear end of 4
A compression spring 20k interposed between the collet body 14 and the collet body 14 allows a rolling element 21, such as a bearing or a roller, which is rotatably supported by the collet body 14 to be brought into contact with the cam surface 18a in a pressing manner. A shaft 21 that supports the rolling element 21
A passes through a long hole 17b formed in the collet slat 17 so as to be slidable back and forth.

The front end of the fret body 4 is divided into upper and lower parts by a groove 14a, which is designed to facilitate the insertion and removal of the electrode rod 2. Further, a flexible power cable 22 that passes through the handle 11 and is guided into the case body 8 is connected to the rear part of the collet body 14 . This power cable 22 is coated with an electrically insulating material.

Therefore, according to this support means 3, by sliding the collet slat 17 in the left-right direction along the guide rail 16, the collent body 14 is moved to the cam m 1
8 a in the left-right direction, so that the electric cover rod 2 maintains a constant distance between its tip and the welding tool holding surface 9 a, and the tip reaches the right end of the i9 contact window 12. The welding start position (solid line position in FIG. 2) is directly opposite to the welding start position (solid line position in FIG. 2), and the welding end position is directly opposite to the left end of the welding window 12 (dotted chain line position R in the same figure). Note that the distance between the tip of the electrode rod 2 and the welding tool holding surface 9a is
As shown in the figure, the welding tool holding surface 9a is set so as to ensure the best arc length when attached to the base metal 23. Further, in this embodiment, the travel 1 of the electrode rod 2 from the welding start position to the welding end position is set to 20+++n.

The drive means 4 is disposed within the welding tool case 1 and has a first
It is constructed as shown in the figure and FIG.

That is, the crank arm 24 is connected to the upper wall 8 of the case body 8.
A bearing or roller 25 is rotatably supported at the center of the upper surface of the collet slat (24a) 17, and is slidable into a long hole (24b) formed at the front end of the crank arm 24. The collet slat 17 is slid from side to side by fitting into the collet slat 17 and swinging the crank arm 24. Further, the drive shaft 26 is rotatably supported by bearings on the upper and lower walls 8a and 8b of the case body 8, and the upper wall 8a and 8b of the case body 8
A mainspring 27 is interposed between b and the drive shaft 26, and the drive shaft 26 is rotated clockwise (
It is designed to rotate forward in the direction of arrow A). The drive shaft 26 is interlocked and connected to the crank arm 24 via appropriate reduction gears (three mechanisms), and when the drive shaft 26 is driven in normal rotation by the mainspring 27, the crank arm 24
The front end of the collet slat 17 is rotated to the left at a speed of When the mainspring 27 is manually reversed in the counterclockwise direction, the mainspring 27 is wound in a direction opposite to the direction in which it is urged to rotate, and the electrode rod 2 is caused to return toward the welding starting position. The mainspring 27 is installed so that its rotational urging force does not completely disappear even when the electrode rod 2 is located at the welding end position, and at least the electric field rod 2 travels from the welding start position to the welding end position. The design is such that the drive shaft 26 can be rotated at a constant speed during the drive shaft rotation section for the purpose of rotation. Further, as a reduction gear mechanism that interlocks and connects the drive shaft 26 and the crank arm 24, a planetary gear (such as a shallow groove) can be used. It is designed to be driven at an optimal constant speed.In this example,
The reduction gear mechanism forms a fan-shaped gear 28 at the rear end of the crank arm 24, and fixes gear 4 to the drive shaft 26,
A first gear 30a that meshes with the gear 28 of the crank arm 24 and has a smaller diameter than the gear 28 is attached to the case body 8, and a drive shaft 26.
A second gear 30 that meshes with gear 4 and has a larger diameter than gear 4.
b is integrally provided with a two-stage gear rotatably supported by a shaft 31. Further, a drive shaft 2 protruding above the upper surface of the case body 8
A knob 32 having a pointer portion 32a is fixed to the upper end of the case body 8, and the knob 32 is designed to easily reverse the drive @26. ``A 1u pole position display scale is attached, and the position and traveling distance of the electrode rod 2 can be visually confirmed by the scale indication by the pointer part 32a). l It is displayed in 1 inch and 9 degrees. For example, when the pointer 32a indicates a scale that indicates "0", the electrode rod 2 is located at the welding start position, and "20" is displayed. When the displayed scale is pointing, it can be visually detected that the electrode rod 2 is located at the welding end position.

The control means 5, as shown in FIGS. 1, 2, and 6,
There is one ratchet that prevents the forward rotation of the drive shaft 26 by the mainspring 27, one groove that controls the operation of this ratchet mechanism, and the operation of both grooves to turn the electricity to the electrode rod 2 ON and OFF.
In other words, the ratchet 1 unit has a ratchet A fixed to the drive shaft 26, and a limit switch 1 unit that controls F.
The engagement position where the claw body 35 is engaged with the ratchet 34 (FIG. 6(A) position) and the ratchet 1-3
4 to the disengagement position (CB position in the figure)), and furthermore, the claw body 35 is supported by a tension spring 37 interposed between this and the case body 8. Accordingly, it is configured to be biased toward the engagement position. In addition, in the first operation structure, an operation pin 38 a protruding from one end of the support tube 8 d protruding inwardly from the case body 8 engages the claw body 35 between the operation bodies. The operation position (FIG. 6 a3) position for moving this to the disengagement position) and the claw body 35
The groove is inserted and supported so as to be freely advanced and retracted between the non-operating position R (positions (A) and (C) in the same figure) where it cannot be operated;
The operating body 38 is normally biased and held in the non-photographing position by a tension spring 39. Further, the limit switch mechanism includes a first limit switch 41, 42 for energizing, and second and third limit switches 41, 42 for energizing, which are fixed at predetermined positions in the case body 8, respectively. The first limit switch is turned off by the first operating rod 35 fixed to the claw body 35.
Turns ON when b comes in contact with and leaves.

When the OFF operation is performed and the claw body 35 is brought to the disengagement position, the ON operation is performed to energize the mH rod 2 (see FIG. 6(B)).

The second limit switch 41 is turned ON when the first operating rod 35b comes into contact with and leaves the switch, similarly to the first limit switch clause.
, is turned OFF, and when the claw body 35 is brought to the engagement position, it is turned ON to stop energizing the electrode rod 2 (see prisoner 6). The third limit switch 42 is a ratchet. Second operating rod 34 fixedly installed
It is turned ON and OFF by the contact and separation of a, and when the drive shaft 26 is located at the rotational position that brings the electrode rod 2 to the welding end position, it is turned ON and stops energizing the electrode rod 2. (See the dashed line diagram in FIG. 6(B)).

To return the electrode rod 2 to the welding starting position, turn the knob 32 to reversely operate the drive shaft 26. At this time, the pawl body 35 is swung as the ratchet rotates. The operating body 38 and the first limit switch are not operated at all by the swinging of the body 35 (see FIG. 6(C)).

Therefore, according to the control means 5, by pressing the operating body 38 and bringing it to the operating position, the electrode rod 2
is energized, arc welding is performed, and the electrode rod 2 is driven to travel by the mainspring 27. When the electrode rod 2 is driven to travel and brought to the welding end position, the operating body is in the operating position and the first limit switch (
Even if the 3rd limit switch 4) is turned on,
2 is turned ON, and electricity supply to the electrode rod 2 is stopped.

Also, while the electrode rod 2 is traveling to the welding end position,
When the suppressing operation of the operating body 38 is stopped, the movement of the electrode rod 2 is caused by the engagement between the ratchet 34 and the claw body 35, and the lightning tM
The power supply to the rods 2 is stopped by turning on the second limit switch 41, respectively. In this manner, the energization and running of the electrode rod 2 can be freely controlled by operating the operating body 38.

The cooling means 6 cools the welding tool case 1 by passing cooling water through a cooling passage formed in the peripheral wall of the shield cap 9.
The groove is designed to cool the shield cap 9, which is the tip of the electrode rod, to exhibit a thermal pinch effect, that is, to squeeze the arc emitted from the electrode rod 2 and effectively melt the base material 23 by the arc. has been completed.

That is, as shown in FIG. 4, the cooling passage 43 is formed in a U-shape that surrounds the upper, lower and right sides of the region in which the tip of the electrode rod 2 runs, and has both end portions 43a, 4.
3a extends away inside the shield cap 9 and is opened at the rear end surface.

Connectors made of copper tubes that protrude from the rear end surface of the shield cap 9 through the packing 10 are connected to the opening ends of both end portions 43a, 43a of the cooling passage guide. Further, a pair of connection passages 45, 45 are bored in the front end thick portion of the peripheral wall of the case body 8, passing through this in the front-rear direction. An O-ring is installed in the front end opening of each connection passage 45, so that when the shield cap 9 is attached to the case body 8, each of the connection materials is fitted and connected in a watertight manner. There is. Furthermore, flexible water supply and drainage spears 48 and 49, such as vinyl pipes, are installed at the ends of both connecting passages 45 and 45, respectively, and are guided through the handle 11 into the case body 8. Therefore, cooling water flows from the water supply pipe to the connecting passage 45. It is supplied to the cooling passage 43 through the connecting fittings, and is discharged from the cooling passage 43 through the connecting fittings and the reading passage 45 to the drain pipe 49.

As shown in FIGS. 1 and 2, the gas supply means 7 has a gas supply passage 50 penetrating through the rear wall of the case body 8 and the handle 11, and supplies argon gas to the rear end opening of the gas supply passage 50. A flexible gas supply pipe 51 such as a rubber hose led from a storage tank for encapsulated gas is connected in a reed. That is, the encapsulated gas supplied into the case body 8 from the gas supply pipe 51 via the gas supply passage □□□ fills the case body 8 and the shield camp 9, and the air inside the welding tool case 1 is transferred to the welding window. 1 arc while completely eliminating it from 12
The welding tool case 1 is used as a flow path for the encapsulated gas. Therefore, the interior of the welding tool case 1 is kept airtight except for the welding window 12 and the connection ports for the gas supply and control tubes 51. Specifically, the case body 8 is connected between the case body 8 and the shield cap 9 by a packing 10.
The drive shaft 26 and the operating body 38 that pass through these are kept airtight by appropriate sealing means (not shown), and as shown in FIG. Water supply and drainage pipes 48, 49 and first to third limit switches 40 to 42
the control cables 52 connected to the handles 1, respectively.
The shield body 53 provided at the rear end of the case 1 is passed through in an airtight manner, and the gas supply passage is passed through to be led into the case body 8.

In addition, each cable 22.52 and water supply and drainage pipe pipe 49 are as follows:
Inside the case body 8, the movable portions of the means 3, 4.5, such as the collet body 14, are arranged so as not to interfere with their operation. Each cable 22.52 and container tubes 48, 49.51 are bundled together by a flexible cover tube 54 attached to the rear end of the handle 11.

Therefore, if you use the arc welding tool configured as described above, you can perform the following extremely simple operations such as butt welding of flat plates (when the base metal surface at the weld line part is a flat surface). can be done.

First, the cooling water is supplied by the water supply pipe and the gas supply pipe 51
After starting the supply of encapsulated gas, hold the handle 11 in your hand and move the welding tool so that the welding tool holding surface 9a, which is the tip end surface of the shield cap 9, At this time, the welding window 12 should be aligned with the welding line 23a. Gas permeable grooves 13, 13
This can be done accurately using the edge of the In addition, mark the shield cap 9 for positioning.
Positioning may be performed using this mark as a reference.

Then, while holding the welding tool in the above state, hold the handle 1.
The finger of the hand holding 1 is used to suppress the operating body A.

When the operating body A is pressed and brought to the operating position, the electrode rod 2 is energized and welding is started, and the electrode rod 2 is driven to travel (FIG. 6 CB)), and the base material 23 is moved to the welding line 23. It will be fusion welded along a.

At this time, the tip of the electrode rod 2 moves along the cam surface 18a, that is, for a certain distance from the welding tool holding surface 9a! (Since the welding tool is moved while retaining debris, if the welding tool holding surface 9a is held closely to the surface of the base metal 23, the arc length can be maintained at a preset constant length. Also, the tip of the electrode rod 2 The traveling area is cooled by the cooling water passing through the cooling passage 43, and a thermal pinch effect is exhibited, and the base metal 23 is melted by the arc.Furthermore, the welding tool is passed through the gas supply pipe 51 and the gas supply passage 50. The encapsulated gas supplied into case 1 is
While completely excluding the air inside the case 1, the gas is ejected from the gas welding window 12 to the outside through the gas permeable grooves 13, 13, effectively enclosing the traveling arc.

Therefore, welding along the welding line 23a of the base material 23 is performed satisfactorily. Moreover, since the arc is completely covered by the shield cap 9, the light from the arc does not leak outside, the worker does not need to wear a protective mask, and even when working outdoors, the arc can cause negative effects due to the wind. I never receive it.

When the electrode rod 2 reaches the welding end position, the third limit switch 42 is turned on to stop the current supply to the electrode rod 2 (dashed line in FIG. 6(B)), and welding is completed.

By the way, if the required welding length is shorter than the maximum traveling distance of the electrode rod 2 (in this example, 20 circles), the pressing operation between the operating bodies may be stopped at the end of welding. When the operation of the operating body fat is stopped, the pawl body 35 engages with the ratchet 1-34, and the movement of the electrode rod 2 is stopped, and the second limit switch 41 is turned on to turn on the current to the iE electrode position. is stopped (Fig. 6(A)). In this case, the operating body 3
If 8 is suppressed, welding can be restarted.

In addition, if the required welding length is shorter than the maximum travel 1 of the electrode rod 2, rotate the knob 32 counterclockwise to return the electrode rod 2 to the welding starting position, and then Just repeat the above operation. Note that the welding status can be accurately visually detected by the scale indicated by the pointer portion 32a of the knob 32.

Further, although the optimum arc length differs depending on the welding conditions, in the embodiment described above, the shield cap 9 is detachably attached to the case body 8, so the shield cap 9 can be replaced as necessary. Arc length can be easily adjusted.

(The following is a blank space) The arc welding tool according to the present invention is not limited to the above-mentioned embodiment, and may be configured as follows, for example.

That is, the upper and lower inclined surfaces 9b, 9b of the shield cap 9
It is also possible to form the welding tool holding surface as a welding tool holding surface so that welding can be performed even when the base metal plates intersect, as shown in FIG.

In this case, the welding holding surfaces 9b, 9b are shaped so as to be attached to the surface of the base metal such that the welding holding surface 9a, which opens the welding window 12, is close to the welding line 23a. Note that if the arc welding tool having such a configuration is not used in the state shown in FIG. 7 but is used as a dedicated welding tool in the state shown in FIG. 8, it is not necessary to provide the gas permeation grooves 13.13. do not have.

Furthermore, the welding tool holding surface 9a and the cam surface 18a can be shaped in accordance with the cross-sectional shape of the base material surface along the welding line. For example, if both surfaces 9a and 18a are made into an arc shape or a wave shape, an arc-shaped base material 23 as shown in FIG. 9 or a wavy base material 23 as shown in FIG. It is possible to weld while ensuring a constant arc length. Furthermore, if the shield cap 9 and the protrusion 18 forming the cam surface 18a are made removable so that they can be replaced as necessary, the shield cap 9 and the protrusion 18 forming the cam surface 18a can be replaced as needed. It becomes possible to perform various types of welding with a negative arc welding tool.

Further, the drive means 4 may be configured using an electric motor instead of being a mechanical means such as the mainspring 27 or a spring. Alternatively, it may use fluid pressure. In this case, part of the encapsulated gas may be used as a driving source.

Further, in the cooling means 6, a low temperature liquid or gas such as liquefied nitrogen gas may be used as the cooling fluid.

Furthermore, the present invention can be applied not only to TIG welding but also to plasma welding. in this case,
Regardless of the encapsulated gas, it is desirable to configure the ejection region of the working gas to travel along with the electrode rod 2.0 (Effects of the Invention) As can be easily understood from the above explanation, the present invention According to the welding tool of the invention, it is possible to automatically perform welding for a length corresponding to the travel distance of the electrode rod without moving the welding tool case, that is, the welding tool. Moreover, by setting the welding tool case so that its welding holding surface is attached to the base metal, the distance between the tip of the moving electrode rod and the base metal can be maintained constant. . Furthermore, there is no need to wear a protective mask, and even when working outdoors, there is no adverse effect from the wind.

Therefore, even an unskilled person can perform the welding work very well and easily, and a welded product of high quality can always be obtained regardless of the skill level of the operator or the welding conditions.

[Brief explanation of drawings]

1 to 7 show an example of a welding tool according to the present invention, and FIGS. 1(A) and 1(B) are longitudinal sectional side views showing the front and rear parts of the welding tool, respectively; Figures 2 (A) and (B) are cross-sectional plan views showing the front and rear parts of the welding tool, Figure 3 is a perspective view of the welding tool, and Figure 4 is a longitudinal cross-section taken along line IV-■ in Figure 1. 5 is a longitudinal sectional front view taken along line V-V in FIG. 1, FIGS. 8 to 10 are longitudinal sectional views showing the state of welding tools during welding, and FIGS.
Each figure is a longitudinal sectional view showing a deformed row of welding tools. l... Welding tool case, 2... Electrode rod, 3... Support means, 4... Drive means, 5... Control means, 6...
Cooling means, 7...Gas supply means, 8...Case body, 9...'i-led cap (tip of the sticky note case), 9a. 9b... Welding tool holding surface, 12... Welding window, 13...
・Gas persecution.

Claims (1)

[Claims] A welding tool case has a welding tool holding surface shaped to be attached to the base metal at the tip and a welding window in the form of a long hole opening in the welding tool holding surface, and a An electrode rod housed in an insulated state, and the electrode rod is supported so as to be freely movable in the longitudinal direction directly facing the welding window while maintaining a constant distance between the tip of the electrode rod and the welding tool holding surface. a support means for driving the electrode rod, a driving means for driving the electrode rod, a control means for controlling energization and running of the electrode rod, a cooling means for cooling the tip of the welding tool case, and a cooling means for cooling the tip of the welding tool case; A welding tool comprising: a gas supply means for supplying welding gas toward the welding window within the tip portion.