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Novel nano-particle reinforced active tungsten argon arc welding method

A nano-particle and activity-enhancing technology, used in welding equipment, welding media, welding equipment, etc., can solve the problems of adverse effects on the structure and performance of welded joints, coarsening of grains in the fusion zone of magnesium alloys, and reduction of mechanical properties of welded joints.

Inactive Publication Date: 2013-04-03
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

[0003] The above research mainly solves the problems of shallow penetration and low welding efficiency of argon tungsten arc welding, but the coverage of active agent in the process of magnesium alloy active welding often has adverse effects on the structure and performance of welded joints
For example: due to the poor thermal conductivity of the active agent, it covers the surface of the molten pool, so that the temperature gradient of the molten pool decreases, and the cooling rate of the molten pool decreases, resulting in serious coarsening of the grains in the fusion zone of the magnesium alloy.
This phenomenon greatly reduces the mechanical properties of welded joints.

Method used

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  • Novel nano-particle reinforced active tungsten argon arc welding method
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  • Novel nano-particle reinforced active tungsten argon arc welding method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] The weight ratio of the oxide active agent and nano ceramic particles used in the nanoparticle enhanced active tungsten arc welding process is TiO 2 : 60% and nano-SiC particles: 40%. TiO 2 Active agent powder and nano-SiC particles were mixed in proportion, and then acetone was added to the mixture to make it into a paste. Then use a flat brush to evenly coat the pasty active agent on the upper surface of the sample, the coating width is about 40 mm, and the average coating amount of the active agent is 5 mg cm -2 . Argon tungsten arc welding is performed after the acetone evaporates.

[0016] For argon tungsten arc welding of AZ31 magnesium alloy plates with a plate thickness of 5 mm, the welding specifications adopted are:

[0017]

[0018] Under this welding standard condition, the corrugation of the weld surface obtained by nanoparticle-enhanced active tungsten argon arc welding is fine and smooth ( figure 2 ); 110% more weld penetration than argon tungste...

example 2

[0020] The weight ratio of oxide active agent and nano-ceramic particles is TiO 2 : 50% and nano-SiC particles: 50%. TiO 2 The active agent powder and the nano-SiC particles are 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 pasty active agent on the upper surface of the sample, the coating width is about 40 mm, and the average coating amount of the active agent is 5 mg cm -2 . Argon tungsten arc welding is performed after the acetone evaporates.

[0021] The welding parameters are the same as Example 1.

example 3

[0023] The weight ratio of oxide active agent and nano-ceramic particles is TiO 2 : 70% and nano-SiC particles: 30%. TiO 2 Active agent powder and nano-SiC particles were mixed in proportion, and then acetone was added to the mixture to make it into a paste. Then use a flat brush to evenly coat the pasty active agent on the upper surface of the sample, the coating width is about 40 mm, and the average coating amount of the active agent is 5 mg cm -2 . Argon tungsten arc welding is performed after the acetone evaporates.

[0024] The welding parameters are the same as Example 1.

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Abstract

The invention discloses a novel nano-particle reinforced active tungsten argon arc welding method, and belongs to the active welding technology. The method is characterized by comprising the following steps of: before welding, mixing oxide activator powder and nano ceramic particles in proportion, and then adding acetone into the mixture so that the mixture is in pasty; then uniformly coating the pasty activator on the surface of samples by a flat brush, wherein the coating width is about 40mm, and the average coating amount is 5.mg.cm<-2>; and carrying out tungsten argon arc welding after the acetone is volatilized. The external waviness of the welding joints obtained by adopting the nano-particle reinforced active tungsten argon arc welding is smooth; compared with the welding joints obtained by the traditional tungsten argon arc welding, the fusion depth is increased by 110%; the crystal particles of the welding joint fusion region are obviously reduced compared with the active tungsten argon arc welding; and the tensile property of the welding joint is improved by 64.6% compared with the active tungsten argon arc welding. The problems that the tungsten argon arc welding fusion depth of magnesium alloy is shallow and the crystal particles of the active tungsten argon arc welding are thick are solved.

Description

technical field [0001] A novel nanoparticle-enhanced active tungsten argon arc welding method. It is characterized in that: before welding, oxide active agent powder and nano ceramic particles are 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 pasty active agent on the upper surface of the sample, the coating width is about 40 mm, and the average coating amount of the active agent is 5 mg cm -2 . Argon tungsten arc welding is performed after the acetone evaporates. Background technique [0002] Magnesium 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 high specific strength and specific stiffness, excellent damping and shock absorption, electromagnetic shielding, machinability and casting properties. Magnesium alloys will ...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235B23K35/362
Inventor 沈骏李诗增
Owner CHONGQING UNIV
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