A laser-hot wire tig composite welding method with normal wire feeding

Abstract

The invention relates to a laser-hot wire TIG composite welding method with normal wire feeding. The method includes: designing a welding groove on the welding part of the thick plate to be welded, and using high-power laser deep penetration welding to realize the rooting welding of the blunt edge of the groove; using laser beams, non-melting electrodes and continuously heated welding wire Composite method is used to perform layer-by-layer filling welding on the groove of the welded thick plate. During the welding process, the height position of the composite welding torch to the molten pool should be adjusted according to the thickness of the single-layer filling. In the direction of welding feed, the laser beam is set in front of the welding wire, the non-melting electrode is set behind the welding wire, and placed in an inert gas shield; The groove weld of the plate is covered by welding to complete the composite welding.

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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