A two-wire welding gun and a two-wire welding device using the same

Abstract

The invention provides a two-wire welding gun that can perform two-wire welding smoothly, and a two-wire welding device using the same. The two-wire welding gun (A1) is provided with a welding wire holding mechanism (2) that can hold a first welding wire (WA) in front of welding direction and a second welding wire (WB) behind the welding direction; the welding wire holding mechanism (2) makes distance (L) between front ends of the first welding wire (WA) and the second welding wire (WB). With such structure, frontend distance (L) between the welding wires (WA, WB) can be set suitable for board thickness of welding mother plate and welding speed, and is capable of realizing smooth two-wire welding.

Description

technical field [0001] The present invention relates to a two-wire welding torch for welding using a leading welding wire and a following welding wire, and a two-wire welding device using the two-wire welding torch. Background technique [0002] Twin-wire welding using a consumable electrode wire and a filler wire is known as one of methods for increasing the welding speed and improving the appearance of the weld bead (for example, Patent Document 1). Figure 16 An example of a conventional twin wire welding device is shown. The twin wire welding apparatus shown in this figure uses the twin wire welding torch provided with nozzle 91A, 91B. The welding wire WA is supplied through the shower head 91A. In addition, the filler wire WB is supplied through the nozzle 91B from behind in the welding direction with respect to the welding wire WA. [0003] The welding wire WA is connected to a welding power source (not shown). This welding power source applies a voltage between the...

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Problems solved by technology

[0004] However, for example, if the distance between the welding wire WA and the filler wire WB is too large, the filler wire WB deviates from the molten pool Mp

In this case, the filler wire WB cannot be melted sufficiently, and there is a possibility of bending

If the distance between the welding wire WA and the filler wire WB is too small, there is a problem that the nozzles 91A, 92B interfere with each other or the parts holding the nozzles 91A, 91B in the above-mentioned double wire welding torch cause problems.

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