Multiple electrode gas protection arc welding method

Abstract

The invention provides a method of multi-electrode gas shield arc welding, which comprises: taking an agent core for the gas shield arc welding as a beforeahead electrode and an afterahead electrode, setting the distance between the beforeahead electrode and the afterahead electrode of 15-50mm, inserting the stuffing welding wire in a melting bath disposed between the beforeahead electrode and the afterahead electrode, circulating an antipole current on the beforeahead electrode and the afterahead electrode, welding when circulating an positive current(welding wire cathode). At the time, the sum L+T of the beforeahead electrode melting speed L(g / min) and the afterahead electrode melting speed F(g / min) is 100-500g / min. The welding speed F(g / min) of the stuffing welding wire is 0.03(L+T) to 0.3(L+T). The method can provide a welding bead with a good appearance, prevent the deformed shape of the welding bead and increase the welding bath stability and prevent the deterioration of the pore resistance.

Description

technical field [0001] The present invention relates to a multi-electrode gas-shielded arc welding method using a flux-cored wire, and in particular to a multi-electrode 1 molten pool welding construction (a gas-shielded arc welding method in which 2 electrodes form 1 molten pool). A multi-electrode gas shielded arc welding method that supplies filler wire. 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 the actual structure, various interference factors ((a) the gap of the fillet weld is too large, (b) the coating film thickness of the pre-coated primer is too large, (c) the current and voltage in the workshop Under the influence of fluctuations, etc.), the uniformity and stability of the molten pool at these construction points are ...

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Problems solved by technology

[0005] However, the inventors of the present invention have found that, in the above-mentioned prior art, there is an appropriate range for the deposition speed of the leading electrode, the trailing electrode, and the filler wire, and especially when the deposition speed of the filler wire is not within the appropriate range, the welding In terms of bead appearance, bead shape defect prevention, and weld pool stabilization, sufficient characteristics may not be obtained, and porosity resistance may deteriorate due to these factors.

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