Novel composite active agent for magnesium alloy active tungsten-insert-gas (A-TIG) arc welding

Abstract

The invention discloses a novel composite active agent for magnesium alloy active tungsten-insert-gas (A-TIG) arc welding, and belongs to an active agent welding technique. The novel composite active agent for magnesium alloy active tungsten-insert-gas arc welding provided by the invention is characterized in that the active agent is Cr2O3, and the weight proportion of the active agent is 65-70%; and a ceramic additive particle is SiC, and the weight proportion of the ceramic additive particle is 30%-35%. The novel composite active agent for magnesium alloy active tungsten-insert-gas arc welding is prepared through the following steps of: firstly grinding Cr2O3 active agent powder and the SiC ceramic particle, and mixing in proportion; then adding acetone into the mixture, so that the mixture becomes pasty; then coating the pasty active agent on the upper surface of a test sample uniformly by a flat brush, wherein the coating width is about 40mm, and the average density per square centimeter is 4-5mg; and carrying out tungsten-insert-gas (A-TIG) arc welding after the acetone is volatilized. Compared with a welding joint which is not coated with the active agent, the welding joint obtained through the welding technology has the advantages that the fusion depth is improved by 60%, an the tensile property is improved by 30%; and in addition, after the active agent is coated, crystal particles in the welding line are thinned obviously, and the difficulties that the fusion depth is shallow in the TIG arc welding, and the crystal particles of the welding line in the traditional active TIG arc welding are toughened seriously are solved.

Description

Technical field [0001] The invention is a new type of composite active agent used in magnesium alloy active tungsten argon arc welding. Its characteristic lies in: before welding, the Cr 2 O 3 The active agent powder and the SiC ceramic particles are milled and mixed in proportion, and then acetone is added to the mixture to make it into a paste. Then use a flat brush to evenly coat the paste active agent on the upper surface of the sample with a coating width of about 40 mm and an average density of 4-5 mg per square centimeter. After acetone volatilizes, argon tungsten arc welding is performed. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength, good electromagnetic shielding and easy recycling. It is called the green engineering material of the 21st century and is widely used in the automobile, aerospace and electronics industries. As a country with large magnesium resources, the industrial application of magn...

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TIG welding after th

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