Efficient welding method and device for arc-assisted laser thin-walled welding titanium pipe

Abstract

The invention relates to an efficient welding method and device for an arc-assisted laser thin-walled welding titanium pipe. By taking a laser as a main heat source and a tungsten inert gas (TIG) arcas an auxiliary heat source, unfilled full penetration linear butt weld welding is implemented on a butt part of a circular thin-walled titanium pipe in the axis direction of the circular thin-walledtitanium pipe formed by curling a flat thin-walled strip-shaped titanium plate or titanium strip. Compared with the prior art, the efficient welding method and device adopt a heat source arrangement method that the preheating TIG is located in front and the laser forming a weld pool is located behind, and adopt relatively small TIG arc current to preheat a welded titanium pipe, so that the laser absorptivity is improved; laser beams with relatively high power act on the preheated titanium pipe and the molten pool is formed, so that the penetration capacity is improved; and with the cooperationof the large laser positive defocusing amount and optimized welding parameters, the laser energy density of the surface of the welded titanium pipe is reduced, splashing at the inner side of the welded titanium pipe in the welding process is eliminated, and the butt gap disturbance generated in the pipe manufacturing process is met.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and relates to an efficient welding method and device for arc-assisted laser thin-wall welding titanium tubes. Background technique [0002] Thin-walled welded titanium tubes are fully-penetrated tubular welded components formed by flattening, crimping, and welding of strip-shaped titanium plates (belts). Thin-walled welded titanium tubes combine the material properties of titanium and titanium alloys such as high strength and toughness, low density and excellent corrosion resistance, as well as the manufacturing characteristics of less production processes, short cycle times, high yields, and low manufacturing costs. It is an ideal material for large-scale equipment in the fields of desalination and seawater desalination in the application of ultra-long and ultra-thin pipes. [0003] The laser-arc hybrid welding welding technology combines two heat sources, laser and arc, for welding. Sin...

AI Technical Summary

Problems solved by technology

Excessive weld reinforcement and undercut on the outer surface of the thin-walled welded pipe seriously affect the assembly quality and service life of the pipe fittings, while the excessive internal reinforcement and welding spatter on the inside of the pipe increase the turbulent kinetic energy of the fluid in the pipe and form a medium flow Erosion stress concentration point, corrosion resistance decline

In the existing technical literature of thin-walled titanium tubes, there is no effective suppression technology for welding defects such as spatter inside the weld in the high-speed welding process, nor is it found that the disturbance of the butt gap and the stability of the weld in the process of pipe making an effective way to adapt

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