JPS6330114B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a welding torch used for gas-shielded arc welding, and more specifically, the torch body is made flexible so that the direction of the torch body can be freely set. .

The torch body of conventional welding torches used for this type of welding is not flexible and is fixed in a certain shape, making it difficult to point the torch tip correctly at the welding location during welding work. However, there were also drawbacks such as being forced into an awkward welding position.

The present invention has been made in view of the current situation, and will be described below with reference to the drawings of FIGS. 1 and 2 showing one embodiment of the present invention.

In Figures 1 and 2, 1 is a connector, one end of which is a power supply cable, a wire guide path,
connected to a gas introduction pipe (none of which is shown),
A torch end 2 is inserted into the other end and is removably fixed with a tightening bolt 3.

Reference numeral 4 denotes an inner tube formed by winding a wire into a coil, and a wire supply path 5 is provided inside.

Reference numeral 6 denotes a conductive coil material having plastic deformability, which is made of copper or copper alloy and is provided so as to surround the outer periphery of the inner tube 4 via an annular space 7 for supplying gas.

8 is a flexible tube constructed by winding metal strips provided around the outer periphery of the conductive coil material 6 in a threaded manner as shown in FIG.
It is also used as a flexible tube for transporting oil, water, etc. or for exhaust.

9 is a flexible heat-resistant insulating tube; 10
is a chip body having a threaded portion at the tip into which a power supply chip is screwed.

Here, the torch end 2, the conductive coil material 6, and the flexible tube 8 are connected and fixed by a method such as brazing or crimping, and similarly, the tip body 10, the conductive coil material 6, and the flexible tube 8 Also connections have been fixed. Also, torch end 2, inner tube 4,
A torch main body is constituted by a conductive coil material 6, a flexible tube 8, an insulating tube 9, and a tip body 10.

Further, 11 is a nozzle for supplying shielding gas to the welding part, 12 is an insulating tube for electrically insulating the chip body 10 and the nozzle 11, and 13 is a power supply chip.

In the above configuration, welding current is transmitted from the power supply cable (not shown), the torch end 2, the conductive coil material 6, the chip body 10, and the power supply chip 13 to the welding wire (not shown).

Further, the shielding gas is supplied from the gas inlet pipe (not shown) to the gas hole 1 provided in the torch end 2.
4, the annular space 7, the gas blowing hole 15 provided in the chip body 10, the inner surface of the nozzle 11, and the welding part.

Meanwhile, the wire is connected to a wire guide passage (not shown)
The wire passes through the wire supply path 5 and the power supply chip 13 and is supplied to the welding part.

According to the welding torch of the present invention as described above,
The torch body can be made flexible, and the plastic deformation ability of the conductive coil material can be used to perform welding work in an appropriately bent shape. , it is possible to prevent the leakage of shielding gas from the torch body, and at the same time, it can sufficiently cope with the torsional force that acts on the torch body.It also gives a natural curved shape to the conductive coil material and makes it conductive. Since appropriate restrictions are placed on the expansion and contraction of the coil material, it is possible to greatly improve the durability of the coil material against repeated bending.

As described above, the present invention provides a flexible welding torch that can freely set the orientation of the torch body according to the shape of the material to be welded or the welding posture, and is also practical and durable, with a simple structure and at low cost. It can be provided at a reasonable price.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional front view showing the main structure of a welding torch according to an embodiment of the present invention, and FIG. 2 is a partially sectional front view showing the main parts of the torch. 4... Inner tube, 5... Wire supply path,
6... Conductive coil material, 7... Annular space, 8...
Flexible tube, 9...Insulating tube.

Claims (1)

[Claims] 1. An inner tube formed by winding a wire into a coil for guiding the wire to the power supply chip;
A conductive coil material having plastic deformation ability is provided to surround the outer periphery of the inner tube through an annular space for supplying shielding gas, and a metal strip is provided to surround the outer periphery of the conductive coil material. For welding, the torch body is provided with a flexible tube formed by meshing and winding the flexible tube in a threaded manner, and a heat-resistant insulating tube that covers the outer periphery of the flexible tube, so that the torch body can be bent freely. torch.