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Mixed active agent for activing flux tungsten inert gas arc welding of magnesium alloy

A technology of argon tungsten arc welding and activator, which is applied in arc welding equipment, welding equipment, welding medium, etc., can solve the problems of increasing melting depth, grain coarsening, adverse effects on the structure and performance of welded joints, etc. The effect of weld penetration and weld grain refinement

Inactive Publication Date: 2018-05-15
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While increasing the melting depth, the two also bring in a large amount of welding heat, which coarsens the grain structure of the joint, thereby reducing the mechanical properties of the joint.
However, the grain coarsening defects brought about by it have adverse effects on the structure and performance of the welded joint.

Method used

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  • Mixed active agent for activing flux tungsten inert gas arc welding of magnesium alloy
  • Mixed active agent for activing flux tungsten inert gas arc welding of magnesium alloy
  • Mixed active agent for activing flux tungsten inert gas arc welding of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] AZ31 magnesium alloy single pass TIG butt welding welding process:

[0019] The experiment adopts AC TIG welding machine (NSA-500-1) to carry out TIG welding on AZ31 magnesium alloy. In the experiment, no active agent was applied, and a single MnCl 2 Active agent and MnCl 2 The active agent was mixed with ZnO for comparative experiments.

[0020] Active agent weight ratio is MnCl 2 : 70% and ZnO: 30%. MnCl 2 and ZnO active agent powder are fully ground and mixed in proportion, and then acetone is added to the mixture to make it into a paste. while single MnCl 2 The active agent is directly adjusted into a paste with acetone. Then use a flat brush to evenly coat the pasty active agent on the upper surface of the sample, the coating width is about 40mm, and the average coating amount of the active agent is 6mg·cm -2 . Solder after the acetone evaporates.

[0021] The specific welding process parameters are as follows:

[0022] The welding specifications adopted...

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Abstract

Provided is a mixed active agent for activing flux tungsten inert gas arc welding of a magnesium alloy. A method comprises the following steps that (1), the mixed active agent is formed by mixing MnCl2 with ZnO, wherein the mixed active agent comprises, by weight percentage, 65%-75% of MnCl2 and 25%-35% of ZnO; (2), according to a use method of the active agent, MnCl2 and ZnO active agent powder is fully ground, after even mixing, an appropriate amount of acetone is evenly added, and the mixture is made into a paste; (3), the upper surface of a sample is evenly coated with the pasty active agent with a flat hairbrush, the coating width is about 40 mm, and the average coating amount of the active agent is 6 mg.cm<-2>; (4), TIG is conducted after acetone is volatilized; and (5), after welding is completed, the morphology and the microstructure of a welding joint and a molten bath are observed, and representation of the mechanical property is conducted.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a mixed active agent which can not only improve the penetration depth of magnesium alloy tungsten argon arc welding joints, but also refine the grain structure, improve the welding quality and increase the tensile performance of the joints. Background technique [0002] Magnesium and its alloys have attracted increasing attention due to their low specific gravity, good processing performance, and abundant natural reserves. Compared with other metal materials and engineering plastics, magnesium alloy has higher specific strength and specific stiffness, excellent damping and shock absorption, electromagnetic shielding, machinability and casting performance, and will become an important commercial lightweight in the 21st century. Structural materials. As a main joining method, welding will play a vital role in its technological innovation and wide industrial applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/36B23K9/167B23K9/235
Inventor 沈骏谢雄
Owner CHONGQING UNIV
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