Titanium alloy laser-MIG composite welding method

Abstract

The invention discloses a titanium alloy laser-MIG composite welding method. A titanium alloy connector to be welded is machined into an I-type groove, and the connector is of a butt joint type. A weld joint protection pulling cover is fixed to an MIG gun nozzle, and a pulling cover body is arranged on the upper surface of a weld joint. Vertical incidence of a laser beam is performed from the position 0-3 mm in front of the MIG, and a welding wire is sent to the upper surface of the groove through the MIG gun nozzle. After a compound heat source melts the welding wire, a connector gap is the filled, and welding forming of a workpiece single track is achieved. The titanium alloy laser-MIG composite welding method overcomes the defects that the titanium alloy weld joint welding is prone to pollution, the requirement for laser welding assembling conditions is high, the efficiency of MIG welding is low, a weld joint heat affection zone is large, and the number of air holes, cracks and the like is increased. Under the premise that the welding efficiency is not reduced, the requirement for the assembling conditions is lowered, and the titanium alloy laser-MIG composite welding method has the advantages that the welding penetration is large, the welding speed is high, the deformation of a workpiece is small, the assembly requirement is low, the bridging capacity of a melting pool is high, the welding quality is high, the performance of the weld joint is good, and automatic welding can be easily achieved.

Description

technical field [0001] The invention relates to a titanium alloy composite welding method, in particular to a titanium alloy laser-MIG composite welding method, which belongs to the technical field of laser material processing. Background technique [0002] Titanium and titanium alloys have been widely used in the aerospace field because of their many unique excellent properties, such as high tensile strength, good high and low temperature performance, corrosion resistance, and high specific strength and specific stiffness. With the continuous expansion of the application range of titanium and titanium alloys, the welding problems have become increasingly prominent. As a precise, efficient and fast high-energy beam welding method, laser welding has been more and more widely used in the aerospace field. However, conventional laser welding also has some problems and defects, such as low utilization rate of laser energy and high assembly precision requirements. In order to so...

AI Technical Summary

Problems solved by technology

At the same time, it makes up for the shortcomings of MIG welding, such as slow welding speed, low efficiency, and large deformation.

[0003] In the process of laser-MIG hybrid welding of titanium alloy, due to the high chemical activity of titanium alloy and the fast speed of laser-MIG hybrid welding, the high-temperature area has a large area, and the welding high-temperature area is extremely vulnerable to pollution from the surrounding environment.

At present, the technology research and application of optical laser-MIG hybrid welding titanium alloy are rare.

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