Arc-starting method for multi-electrode single-side welding device and multi-electrode single-side welding device

Abstract

The invention provides an arc-starting method for a multi-electrode single-side welding device and a multi-electrode single-side welding device, the method is characterized by comprising: a first procedure configuring an electric arc generating auxiliary agent to a first electrode; a second procedure making the first electrode generate an electric arc and then immediately making a welding trolley travel; a third procedure performing control in three stages comprising a first stage making a second electrode generate an electric arc on a molten bath and feeding solder wires as the second electrode at a low speed, a second stage making the feeding stop, and a third stage performing feeding at a common speed changeable according to change of the voltage value of the solder wires; a fourth procedure making electrodes after a third electrode generate electric arcs on the molten bath, and furthermore, controlling feeding of the solder wires as electrodes after the third electrode via the one-to-three three stages. Via the method, automation of arc-starting can be realized, and the use amount of the electric arc generating auxiliary agent can be reduced.

Description

technical field [0001] The present invention relates to an arc starting method of a multi-electrode single-side welding device used in butt-joint arc welding of large-sized plates such as a plate butt joint process of a hull block production line in a shipyard, and a multi-electrode single-side welding device that starts arc welding by the arc starting method . Background technique [0002] In butt arc welding of large plates at shipyards, etc., single-sided arc welding using multiple electrodes is mainly used as a high-energy-efficiency welding method. In recent years, in the shipbuilding industry, for the purpose of increasing the efficiency of welding operations, automation of welding processes has been desired, and automation of arc starting has been strongly desired. [0003] Conventionally, arc starting methods described in Japanese Patent Application Laid-Open No. 4-309471 and Japanese Patent Laid-Open No. 8-52573 have been used, for example. [0004] Japanese Paten...

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Problems solved by technology

Therefore, there is a problem that the movement of the welding cart on which the first to third electrodes are mounted stops, and as a result, the arc cannot be generated by the third electrode.

[0007] In addition, since the first and second electrodes do not use an arc generation auxiliary agent, it takes time to generate an arc, and the welding wire fed as the first and second electrodes collides with the material to be welded, and the movement of the welding cart stops. Therefore, there is also the problem that arcs cannot be generated in the first and second electrodes.

In addition, due to the collision of the welding wire, the welding trolley on which the welding wire, that is, the electrode is mounted, is lifted, and there is also a problem that the burden on the welding device is large.

Therefore, an automated method for arc initiation is not sufficient

[0008] In addition, in the arc starting method described in Japanese Patent Application Laid-Open No. 8-52573, an arc generation assisting agent is used, but the arc generation assisting agent is arranged on the electrodes after the third electrode as the subsequent electrode, and is not arranged on the leading electrode. on the first electrode of the electrode

Therefore, the arc generation time of the first electrode as the leading electrode cannot be shortened, and thus there is a problem that the welding wire as the first electrode cannot be prevented from colliding with the material to be welded, and the arc cannot be generated by the first electrode.

[0009] In addition, in actual welding, not only the third electrode but also the fourth electrode needs to arrange the arc generation auxiliary agent, and the use amount of the arc generation auxiliary agent increases, which is uneconomical and has the problem of lowering the work efficiency.

In addition, in order to eliminate welding residue at the welding start part, a tab is provided on the extension line of the welding line, but since all electrodes generate an arc at the start of welding, there is also a problem that the tab becomes long and uneconomical

Therefore, an automated method for arc initiation is not sufficient

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