JP3882758B2 - Welding torch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welding torch used for welding work.
[0002]
[Prior art]
In recent years, high use rate and high efficiency of welding work have been demanded. For welding torches, the material and structure have been improved to extend the life of the tip, and the nozzle material that is difficult for spatter to adhere to weld for a long time. Surface treatment is performed. In addition, water cooling of the torch is performed.
[0003]
A conventional welding torch is shown in FIG. 5, and includes a welding wire 1, an inner tube 2 for guiding the welding wire, a shield gas 3, a cooling water 4, a torch body 5, and a hole through which the torch body 5 is passed. Provided are an insulator 6 provided, an adapter 7 having a cooling water passage inside and fitted to the insulator 6, a hole through which the torch body 5 is passed, and a hole through which the shield gas 3 is passed. An orifice 8 provided with a screw, a nozzle 9 having a cooling water passage inside and detachably connected to the adapter 7; and an orifice 8 having a diameter larger than the hole of the insulator 6 in the torch body 5; the holding insulator 6 and by the adapter 7 of the torch body 5 and the orifice 8, the tip adapter 12 for removably connecting the welding tip 11 Serial is a welding torch connected to the distal end of the torch body 5.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-285866 (Claim 6, FIG. 1)
[0005]
FIG. 5 shows the conventional welding torch. The cooling water path passes through the middle adapter 7 from the base of the torch main body, cools the tip of the nozzle 9, and then returns to the middle adapter 7 to return the torch main body. Return to the root. The route is similar to that in the patent literature.
[0006]
The adapter 7 and the insulator 6 are stopped by the torch body 5 and the orifice 8.
[0007]
6 and 7 show the DD cross section and the EE cross section in FIG. 5, and show the paths and arrangement of the shield gas 3 and the cooling water 4.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-28586 (Claim 6, FIG. 1)
[Patent Document 2]
Japanese Unexamined Patent Publication No. 2000-135565 (Claims 1-6, FIGS. 1, 3)
[0009]
[Problems to be solved by the invention]
However, the conventional welding torch is structured to cool from the base portion of the torch body 5 through the middle adapter 7 and cool to the nozzle 12, and cools the position away from the tip 11. If a low copper or copper alloy tip is used, when continuous welding or high current welding is performed for a long time, the temperature of the tip 11 becomes high due to welding heat or double heat, which is oxidized and softened. There was a problem that the current transferability was impaired and the arc became unstable and could not be welded.
[0010]
In addition, since the adapter 7 is screwed with the orifice 8, if the orifice 8 is consumed due to spattering during welding, the adapter 7 and the insulator 6 are released during replacement and the cooling water leaks and the cooling water is removed and replaced. It took time and effort.
[0011]
In addition, since the entire length of the orifice 8 is short, there is a case where a short circuit occurs between the nozzle 9 and the torch body 5 when a lot of spatter adheres.
[0012]
Further, when the torch body and the nozzle are each cooled, the water path increases, the structure is large, the parts are difficult to attach and detach, and welding defects (such as blow holes) are caused by water, so the present invention solves these problems. The purpose is to provide a torch.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, a welding torch according to the present invention is provided with a welding wire, an inner tube for guiding the welding wire, a torch body for passing shield gas and cooling water, and a hole for passing the torch body inside. An insulator having a cooling water passage inside and fitted into the insulator, an orifice through which the torch body passes and a hole through which the shielding gas passes, and a cooling water passage inside. A nozzle that is detachably connected to the adapter, an insulator stopper having a diameter larger than the hole of the insulator is provided in the torch body, and a stopper that holds the adapter between the insulator and the insulator stopper. A tip adapter for detachably connecting a welding tip to the tip of the torch body, and The cooling water is cooled from the root part of the torch body to the tip part of the torch body by constructing a welding torch that sandwiches the orifice with the tip and the tip adapter, and then cooled and circulated through the adapter at the tip of the nozzle. Return to the base of the torch body in order.
[0014]
Further, a nozzle water supply pipe and a nozzle drain pipe that circulate the cooling water to the nozzle are concentrically arranged to form a plug, and the plug has an axis parallel to the axis of the nozzle outside the root portion of the nozzle. The adapter water bottle fitting provided on the line and coaxially with the nozzle base side is equipped with a socket coaxial with the plug, and the cooling water supplied from the water bottle fitting is supplied to the nozzle water supply via the socket. Water is fed to the pipe, and a valve that is pressed by a spring is provided inside the socket in conjunction with the attachment and detachment of the nozzle, and when the nozzle is released from the adapter water tube fitting, the valve is pressed by the spring to move the valve to the tip of the socket. The cooling water supplied from the adapter water bottle fitting circulates in the socket and is drained to the adapter water bottle fitting.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0016]
(Embodiment)
In FIG. 1, 1 is a welding wire passing through the inside for welding, 2 is a coil or tube-shaped inner tube made of SUS, copper, copper alloy, resin, etc. for guiding the welding wire, and 3 is shielded during welding. For gas such as argon or carbon dioxide gas, 3a for gas outlet, 4 for cooling water for cooling the nozzle and torch body, 5 for shielding gas inside, brass for guiding the welding wire, copper, copper alloy A torch main body, 6 is an insulator made of an insulator provided with a hole through which the torch main body 5 is passed, 7 is an adapter made of metal having a cooling water passage inside and fitted into the insulator 6, 8 An orifice made of an insulator provided with a hole through which the torch body 5 is passed and a hole through which the shield gas 3 is passed. Connecting to copper, the nozzle consisting of a copper alloy, 6a is the insulator locking portion of larger diameter than the hole of the insulator is provided on the torch body 5 6, 10 torch body 5 with an outer diameter larger than the hole of the insulator 6 stop portion made of an insulator that holds between the insulator stop portion 6a of the adapter 7 and the insulator 6 is provided to, 19 to 21, O-ring was deployed in the insulator 6, 11 a welding wire A welding tip made of copper or copper alloy for guiding and feeding power, 12 is a tip adapter 12 made of copper or copper alloy for detachably connecting the welding tip 11 and connected to the tip of the torch body 5, and By configuring the welding torch so that the orifice 8 is sandwiched between the stop portion 10 and the stop portion 10, the cooling water can flow from the base portion of the torch body 5. Exits the adapter 7 of the intermediate portion, after circulating nozzle 9 tip, and the structure of the welding torch back to the torch body root portion in the reverse order.
[0017]
2, 3, and 4 show the AA cross section, the BB cross section, and the CC cross section of FIG. 1, and show the paths and arrangement of the shield gas 3 and the cooling water 4.
[0018]
Moreover, the welding torch structure which provided the O-ring in the front-end | tip part of the said chip adapter 12 or the torch main body 5, and circulated the cooling water path | route in the chip adapter is shown.
[0019]
Furthermore, the following welding torch structure that makes the nozzle 9 easy to attach and detach is shown.
[0020]
13 is a nozzle water supply pipe made of metal for circulating the cooling water to the nozzle 9, 14 is a nozzle drain pipe made of metal, and 15 c is a plug made of metal arranged concentrically with the nozzle 9, The adapter 9 is provided on the axis parallel to the axis of the nozzle 9 on the outer side of the base of the nozzle 9, and 15 is an adapter water bottle fitting 15 made of metal provided on the base side coaxial of the nozzle 9, and the plug A socket 15d coaxial with 15c is provided, and the cooling water 4 supplied from the adapter water bottle fitting 15 is fed to the nozzle water supply pipe 13 through the socket 15d. 15b is the nozzle inside the socket 15d. 9 is a valve made of metal pressed against the spring 15a in conjunction with the attachment and detachment of the nozzle 9. When the nozzle 9 is disengaged from the adapter water tube bracket 15, the spring 15a is pressed. The valve 15b closes the tip of the socket 15d, and the cooling water 4 supplied from the adapter water tube bracket 15 circulates in the socket 15d and is drained to the adapter water tube metal member 15. A torch structure with an O-ring provided for each is shown.
By cooling the tip from the base of the torch body 5 with cooling water , the temperature of the tip during welding is lowered (when MIG welding is performed with a welding current of 500 A, the tip mounting portion temperature is 470 deg to 180 deg). Such a chip temperature does not become high and is not oxidized or softened.
[0021]
Further, the adhesion of spatter is reduced, and stable electrical conductivity with the wire can be secured. For this reason, it is possible to perform long-time welding and high usage rate welding with a chip made of inexpensive copper or copper alloy. In addition, by providing a plug and socket on the parallel axis at a position parallel to the axis of the nozzle 9, the nozzle 9 can be easily attached and detached, and when the nozzle 9 is removed, Since it stops immediately and cooling water does not adhere in the nozzle, there is no defect such as a blow hole in welding, and good quality welding can be performed.
[0022]
Since the adapter 7 and the insulator 6 are screwed with the stopper 10, even if the orifice is consumed, the adapter 7 and the insulator do not open at the time of replacement. Furthermore, since the entire length of the orifice 8 is extended to the tip of the torch main body, there is no short circuit due to sputtering.
[0023]
Further, since the cooling water path is performed in a series as in the conventional case, the torch shape can be reduced, and the effect is great.
[0024]
【The invention's effect】
As described above, according to the welding torch of the present invention, good welding can be performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of the welding torch of the present invention. FIG. 2 is a cross-sectional view of AA in the embodiment of the welding torch of the present invention. FIG. 4 is a cross-sectional view of the welding torch according to the present invention. FIG. 5 is a cross-sectional view of the conventional welding torch. FIG. -D sectional view [Fig. 7] EE sectional view of a conventional welding torch [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Welding wire 2 Inner tube 3 Shielding gas 3a Gas ejection port 4 Cooling water 5 Torch main body 6 Insulator 6a Insulator stop part 7 Adapter 8 Orifice 9 Nozzle 10 Stop part 11 Tip 12 Tip adapter 13 Water supply pipe 14 Drain pipe 15 Adapter water pipe kanag 15a Spring 15b Valve 15c Plug 15d Socket 16 O-ring 17 O-ring 18 O-ring 19 O-ring 20 O-ring 21 O-ring

Claims (4)

A welding wire, an inner tube for guiding the welding wire, a torch body for passing shield gas and cooling water, an insulator having a hole for passing the torch body inside, and a passage for cooling water inside, and the insulator An adapter for fitting, an orifice having a hole through which the torch body passes and a hole through which the shield gas passes, and a nozzle having a cooling water passage inside and detachably connected to the adapter, An insulator stopper having a diameter larger than the hole of the insulator is provided on the main body, a stopper having an outer diameter larger than the hole of the insulator is disposed on the torch body, and the insulator and the adapter are connected to the insulator stopper and the stopper. held between the tip adapter for connecting the welding tip detachably to the distal end of the torch body Ting to a welding torch. The welding torch of claim 1, wherein the cooling water passage of the torch body is arranged to preparative chromatography switch tip.   The welding torch according to claim 1, wherein a water stop means is provided on the adapter. The welding torch according to claim 1, wherein the orifice is sandwiched between the stopper and the tip adapter.

Images