JPS5919579Y2 - arc welding torch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a non-consumable electrode type gas-encapsulated arc welding torch equipped with a wire feeding device for automatically feeding the welding wire into the molten pool or arc. .

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2.

In the figure, 1 is a cylindrical bundle made of plastic, and a power cable and a gas hose pass through the bundle 1.

2 is a torch head provided at the tip of the bundle 1 and the outside is molded with plastic; 3 is a torch cap screwed into the torch head 2; 4 is a collector chucked to the torch cap 3 and fixed to the torch head 2. 5 is a base material, 6 is an arc generated between the electrode 4 and the base material 5, 7 is a molten pool formed by the arc 6, and 8 is a ceramic screwed onto the torch head 2. A shielding gas 9 that protects the electrode 4 and the molten pool 7 from oxidation is guided through a nozzle made of the same material.

10 is a torch switch that feeds the wire; 11 is a wire guide adjustment device that adjusts the relative position between the electrode 4 and the welding wire 12; and 13 is connected to the wire guide adjustment device 11 via a guide holder 14. The wire guide 15 is a flexible conduit tube having one end inserted into the wire guide 13 and the other end rotatably attached to the bundle 1 by a cable band 16, through which the welding wire 12 is fed. There is.

To perform welding using the above torch, welding wire 12
It is necessary to feed the welding wire 1 directly below the electrode 4 where the energy density of the arc 6 and molten pool 7 is highest.
The distance between the electrode 2 and the electrode 4 must be extremely short.

Therefore, this device has the disadvantage that the molten beads of the welding wire 12 are easily welded to the electrode 4, and the electrode 4 and the welding wire 12 may be short-circuited due to operator's camera shake or the like.

This invention was made to eliminate the above drawbacks, and by deflecting the arc toward the welding wire by jetting gas through another small-diameter gas pipe installed in the nozzle, the energy density of the arc is maximized. The purpose is to shift the position from directly below the electrode to the welding wire side and increase the distance between the welding wire and the electrode to prevent molten balls and short circuits.

An embodiment of the present invention will be described below with reference to the drawings.

Figures 3 and 4 show a conventional arc welding torch equipped with a small-diameter gas pipe. In the figure, 17 is a small-diameter gas jet pipe connected to a shielding gas cylinder via a gas hose 18, and the nozzle 8 by brazing or the like.

19 is a ceramic insulator screwed onto the torch head 2; 20 is a cap nut that fixes the nozzle 8 to the insulator 19 at an arbitrary angle; It is intended to be placed on the side and fixed.

Next, the action of the gas jetted from the gas jet pipe 17 will be explained.

During welding, when the gas is jetted, the arc 6 is deflected toward the welding wire 12.

Therefore, the molten pool 7 also extends from directly below the electrode 4 to the welding wire 12.
Since the welding wire 12 shifts to the side of
2. The working area where melting is likely to occur can be expanded.

Furthermore, in the above embodiment, the case where the same jet gas as the shielding gas is used is explained, but the jet gas and the shielding gas are connected to separate gas cylinders, for example, argon gas is used as the shield gas, and ionized dust is used as the jet gas. When high helium gas is used, the energy of the molten pool increases, the penetration becomes deeper, and the amount of wire melting can be increased.

As described above, according to the present invention, a small-diameter pipe is provided on the opposite side of the welding wire to the electrode, and gas is ejected from this pipe to deflect the arc toward the welding wire and to control the feeding position of the welding wire. Although the deflection is made from directly below the electrode to the welding wire side, it prevents the molten ball of the welding wire from welding to the electrode, prevents a short circuit between the electrode and the welding wire, and furthermore prevents the jet gas and shielding gas from collapsing. This has the effect of increasing the energy of the molten pool by changing the type of molten metal.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional device, FIG. 2 is a side view of the same, FIG. 3 is a front view of an arc welding torch according to an embodiment of the present invention, and FIG. 4 is a side view of the same. DESCRIPTION OF SYMBOLS 1... Handle, 2... Torch head, 4... Electrode, 5... Base material, 6... Arc, 7... Molten pool,
8... Nozzle, 9... Shielding gas, 10... Torch switch, 11... Wire guide adjustment device, 12
... Welding wire, 17... Gas jet pipe, 18.
・・Gas hose, 19・・Insulator, 20・
・Fukuro Natsuto. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Scope of utility model registration request] (1) In a welding torch equipped with a shielding gas jetting device and a welding wire feeding device, a small-diameter pipe is provided on the opposite side of the electrode from the welding wire to serve as another gas jetting port, and the shielding gas cylinder is 1. An arc welding torch characterized by being configured such that the arc is deflected toward the welding wire by connecting it to the electrode to blow out gas, and the welding wire is deflected from directly below the electrode toward the welding wire. (2) The arc welding torch according to claim 1, which is a registered utility model, characterized in that the small-diameter pipe is connected to a gas cylinder of a type different from that of the shielding gas to cause a jet of gas.