Double-side laser wire melting welding device and welding method for thin-plate T-shaped joint

Abstract

The invention discloses a double-side laser wire melting welding device and a welding method for a thin-plate T-shaped joint. The welding device comprises two sets of welding components positioned onthe two sides of a vertical plate; each welding component comprises a laser, a TIG welding gun and a TIG power supply; a laser beam is illuminated at the junction of the vertical plate and one side ofa bottom plate to form a keyhole and a molten pool; a wire melting electric arc is formed between a welding wire and the end part of the TIG welding gun; the wire melting electric arc is not in contact with the vertical plate, the bottom plate and the molten pool; and a liquid metal formed by molting the welding wire enters the molten pool through a fine seam reserved between the vertical plate and the bottom plate. According to the double-side laser wire melting welding device and the welding method for the thin-plate T-shaped joint, the keyhole is formed by melting the welding wire by adopting low-energy electric arcs on the two sides of the vertical plate and melting a base material by adopting another high-energy laser beam; the liquid metal formed by molting the welding wire enters the keyhole through the fine seam between the vertical plate and the bottom plate; and because the welding wire is far away from the keyhole after being molten by the low-energy electric arcs, the impact on the keyhole can be avoided and the welding stability can be improved, thereby improving the welding seam quality.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a thin-plate T-joint bilateral laser fuse welding device and a welding method. Background technique [0002] The T-joint is a T-shaped joint formed by welding a bottom plate and a vertical plate vertically arranged in the middle of the bottom plate. It is widely used in aviation, aerospace and other fields. Because laser welding has the advantages of large penetration depth, small deformation, and high welding efficiency, it is used in thin plate T-joint welding. However, laser welding has a small tolerance for the seam gap. When the gap is too large or the gap is uneven, welding defects such as breakdown and weld leakage are prone to occur, which affects the quality of the weld. Therefore, it is necessary to add welding wire to improve the seam gap. tolerance. [0003] The Chinese patent "Laser Filling Wire Welding Method for Marine Aluminum T-Shaped Profiles" published ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of insufficient welding wire melting and large keyhole fluctuations in the process of double-sided laser wire-filling welding of thin-plate T-joints, which ultimately affects the quality of the weld, the present invention provides a double-sided laser fuse welding device for thin-plate T-joints and Welding method, this welding method adopts small-energy arc melting welding wire on both sides of the vertical plate, and another beam of high-energy laser melts the base metal to form a keyhole, and the molten metal formed by melting the welding wire enters through the gap between the vertical plate and the bottom plate into the keyhole, thereby avoiding the impact on the keyhole, improving the stability of the keyhole and the quality of the weld

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