Multielectrode gas-shielded arc welding method

Abstract

The present application relates to a multielectrode gas-shielded arc welding method in which a filler wire is inserted between leading and trailing electrodes, a distance between the electrodes is 20 to 30 mm. Variables L, T, F, X, Y, alpha, beta, gamma and satisfy the following expressions: 40 DEG <= L<= 60 DEG, 40 DEG <= T <= 60 DEG, X + 5 DEG <= F <= X + 20 DEG or Y - 20 DEG <= F <= Y - 5 DEG, 4 DEG <= alpha <= 14 DEG, 5 DEG <= beta <= 15 DEG, - 5 DEG <= gamma <= 5 DEG, where X represents the larger one of a leading-electrode horizontal angle L and a trailing-electrode horizontal angle T, Y represents the smaller one of the angles, F represents a filler-wire torch angle, alpha represents a leading-electrode backward angle, beta represents a trailing-electrode forward angle, gamma represents a filler-wire torch forward or backward angle. A target position of the filler wire is within a range between a lower end of the vertical plate and a position at a height of (upper leg length - 2 mm) from the lower end. According to the method, the shape of the welding bead can be remarkably improved, the arc noise between the leading and trailing electrodes can be reduced, and the equipment is easy.

Description

technical field [0001] The present invention relates to a multi-electrode gas-shielded arc welding method using a flux-cored wire, and more particularly to a method of supplying a filler wire between electrodes in a multi-electrode 1 molten pool welding construction in which a single molten pool is formed with multiple electrodes Multi-electrode gas shielded arc welding method. Background technique [0002] Conventionally, in order to increase the efficiency of horizontal fillet welding in shipbuilding and bridges, the single molten pool welding construction method among the multi-electrode gas shielded arc welding methods has been adopted. However, in the case of an actual structure, there are various interference factors as follows: (a) too large gap at the fillet weld; (b) too large coating film thickness of the pre-coating primer (shopprimer); (c) ) The current and voltage fluctuations in the factory, etc., lead to the loss of uniformity and stability of the melt (汤流まり)...

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Problems solved by technology

[0004] In the welding method described in this patent document, a filler wire is inserted as a method of alleviating the arc interference generated between the leading electrode and the trailing electrode, but the insertion of the filler wire leads to an increase in the amount of weld metal, resulting in some Tendency of bead shape to be convex

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