Laser-heat wire TIG composite welding method achieving normal wire feeding

Abstract

The invention relates to a laser-heat wire TIG composite welding method achieving normal wire feeding. The method comprises the steps that a welding groove is designed out on the welding portion of a welded thick plate, and backing welding of the root face through high-power laser deep melting penetration welding; layer-by-layer filling welding is carried out on the groove of the welded thick plate in a manner of compounding a laser beam, a non-molten electrode and a welding wire achieving continuous heating, in the welding process, a composite welding torch should be adjusted to the height position of a molten bath according to the single-layer filling thickness, the welding wire is induced and heated through a heat wire heating device, in the welding feeding direction, the laser beam is arranged in front of the welding wire, and the non-molten electrode is arranged behind the welding wire and is put in an inert gas shielding shroud; and the groove weld of the welded thick plate is subjected to cosmetic welding through the above composite welding manner, and compose welding is completed.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a laser-hot wire TIG composite welding method with normal wire feeding. Background technique [0002] Laser arc hybrid welding combines two heat sources with completely different physical properties and energy transmission mechanisms, and acts on the same processing position at the same time. It can not only give full play to the respective advantages of the two heat sources, but also make up for their respective deficiencies. A new and efficient welding method has been developed. Among them, the laser-TIG arc hybrid welding process is stable, the arc stability is good, and it is easy to obtain a good weld shape. [0003] Laser welding has two welding modes: deep penetration welding and heat conduction welding. Small hole-type pores are generated and difficult to eliminate; when the laser beam in the heat conduction welding mode is used to realize the hybrid welding of the las...

AI Technical Summary

Problems solved by technology

However, due to the heating device, the heating zone of the welding wire is still a distance away from the molten pool. Before the precisely temperature-controlled welding wire passes through this distance and is sent into the molten pool, under the influence of factors such as heat radiation and heat conduction, there is a certain gap in the heating wire. Heat loss, that is, the temperature of the hot wire will drop to a certain extent

For metal materials with fast heat dissipation, the heat loss of the hot wire is relatively greater, which reduces the deposition efficiency of the hot wire

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