Laser-MIG composite double-gun synchronous symmetric welding method for titanium alloy T-shaped joint of medium plate

Abstract

The invention discloses a laser-MIG composite double-gun synchronous symmetric welding method for a titanium alloy T-shaped joint of a medium plate, and belongs to the technical field of metal material welding. According to the method, high-power optical fiber laser-MIG composite welding double guns are adopted for synchronously and symmetrically welding the T-shaped joint, beveling is avoided, two laser beams are divided by an IPG laser according to the 50% energy division principle and transmitted to two sets of laser-MIG composite welding devices through optical fibers, the left laser-MIG composite welding device and the right laser-MIG composite welding device are symmetrically arranged along a web of the T-shaped joint, and in the welding process, the laser beams are arranged in front of the laser-MIG composite welding devices; according to the method, laser spots on the two sides and the ends of the welding wires are symmetrically distributed along the center line of a welding line of the T-shaped joint in the mode that the welding wires are arranged at the back, laser and MIG electric arcs are synchronously started, then welding is symmetrically and synchronously carried out, the high-power laser is arranged at the front part to penetrate through the joint, and the electric arcs are arranged at the back part to form a welding foot in a filling mode, and one-time welding forming of the marine titanium alloy T-shaped joint with the thickness ranging from 6 mm to 20 mm can be achieved through the method. Welding deformation can be reduced, and welding efficiency and welding quality are improved.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a laser-MIG composite double-gun synchronous symmetrical welding method for a medium-thick plate titanium alloy T-joint. Background technique [0002] For the welding of titanium alloy medium and thick plate (6mm-20mm) T-sections with high load-bearing structural strength requirements, the root of the titanium alloy T-section welding joint must be fully penetrated, and the size of the welding leg and the dimensional accuracy of the workpiece after welding meet the relevant requirements. The traditional welding method is to open a single-sided large-angle bevel, and then use argon tungsten arc welding (GTAW) or GMAW to fill the cover welding, which has low welding efficiency, large heat input, and large deformation after welding, which often leads to Distortion and deformation, the subsequent shape correction is extremely difficult, and serious deformati...

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Problems solved by technology

[0002] For the welding of titanium alloy medium-thick plate (6mm-20mm) T-shaped bar with high load-bearing structural strength requirements, it is necessary to meet the complete penetration of the root of the welded joint of titanium alloy T-shaped bar, and the size of the weld leg and the dimensional accuracy of the workpiece after welding meet the relevant requirements. The traditional welding method is to open a large-angle groove on one side, and then use argon tungsten arc welding (GTAW) or molten gas shielded welding (GMAW) to fill and cover the welding. The welding efficiency is low, the heat input is large, and the deformation after welding is large, which often leads to Distorted and deformed, it is extremely difficult to correct the shape later. If the deformation is serious, the profile cannot be repaired, resulting in unqualified parts

[0003] At present, the following new high-efficiency welding methods are often used for medium and thick plate T profiles that require welding leg size: one method is to open double-sided grooves, use double-sided double-arc arc welding, and multi-layer and multi-pass filling cover welding. It can effectively prevent the profile from twisting and deforming, but this method has a large amount of welding filling, a large amount of heat input, and it is difficult to protect the titanium alloy. At the same time, the cumulative longitudinal bending deformation will be large; The laser penetrates once or penetrates twice on both sides, and then uses argon tungsten arc welding (GTAW) or molten gas shielded welding (GMAW) to fill the cover surface on both sides. The size of the welding leg meets the technical requirements, but this requires a high-power laser. Laser can penetrate the web once on one side or twice on both sides. This method can easily lead to difficulties in ensuring the verticality and curvature of the T-shaped bar, and the welded joint is prone to defects such as unfused side walls; the third method is to use double Face symmetrical high-power laser synchronous welding, this method can achieve double-sided one-time penetration, and then use argon tungsten arc welding (GTAW) or molten gas shielded welding (GMAW) to fill the cover surface, so that the size of the welding leg meets the technical requirements, which This method is effective in controlling welding deformation, but requires multiple welding, the cumulative bending deformation of arc welding will be large, and the improvement of welding efficiency is not obvious

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