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Magnesium alloy laser-TIG welding process

A welding method and magnesium alloy technology, applied in the field of material engineering, can solve the problems of high energy consumption and low production efficiency, and achieve the effects of high joint quality, high production efficiency and energy saving

Active Publication Date: 2004-09-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] In order to solve the shortcomings of the existing welding methods, the present invention adopts the laser-TIG welding process for magnesium alloy profiles and castings, and uses the combination of laser and TIG two processes to propose the mutual organic matching of the power of the two heat sources in the welding process, which can Obtain high-quality, well-formed magnesium alloy welded joints, which solves the problems of high energy consumption and low production efficiency in the original welding method

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Embodiment Construction

[0009] This implementation mode refers to figure 1 As shown, 1 is the laser beam, 2 is the TIG welding torch, and 3 is the shielding gas cover, where the distance between the impact point of the laser beam 1 and the center of the welding pool of the TIG welding torch 2 is D LA 2.5mm; the distance from the tip of the welding torch 2 tungsten electrode to the workpiece is 1.2mm. Then set the shielding gas flow, TIG welding current and laser power according to the plate thickness. When welding the deformed magnesium alloy AZ31B with a plate thickness of 2.5mm, the TIG arc welding current is selected as 90A, the laser power is 500W, and the welding speed can reach more than 1000mm / min. In this way, on the one hand, the shape of the weld seam is significantly improved, on the other hand, the welding quality is good and the efficiency is high, so that the energy can be used most effectively.

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Abstract

The present invention relates to material engineering technology, and is one laser-TIG welding method for magnesium alloy shapes and castings. The laser-TIG welding process combines two kinds of welding techniques, laser welding and TIG welding, and provides the organic matching of two kinds of heat source powers. The laser-TIG welding process is superior to available welding processes in that it can obtain magnesium alloy joint with high welding quality and good shape, jointing strength reaching 95 % of mother material strength, high production efficiency and saving in energy source.

Description

Technical field [0001] The invention belongs to the technical field of material engineering and relates to a laser-TIG welding method for profile and casting magnesium alloys. Background technique [0002] As a green engineering material in the 21st century, magnesium alloy has been valued by countries all over the world. The development level of magnesium alloy joining technology is one of the key factors affecting the wide application of magnesium alloys. At present, the research on magnesium alloy welding is mainly concentrated on TIG, electron beam, laser beam, and friction stir welding. Friction welding; or the quality of welded joints does not meet the high requirements of modern development, such as TIG; or inconvenient operation, difficult practical application, such as electron beam. Contents of the invention [0003] In order to solve the shortcomings of the existing welding methods, the present invention adopts the laser-TIG welding process for magnesium alloy...

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Application Information

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IPC IPC(8): B23K9/16B23K26/348B23K31/12
Inventor 刘黎明宋刚
Owner DALIAN UNIV OF TECH
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