Effect of deep cryogenic treatment on microstructure and properties of WE43A dissimilar repair welding joints

GUAN Xiaoguang; XU Zhongshan; LEI Meike; ZHANG Renjun; ZHOU Changhai

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Effect of deep cryogenic treatment on microstructure and properties of WE43A dissimilar repair welding joints
Vol. 49, Issue 12, Pages: 86-90(2019)
Published：2019
DOI：
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DOI：

GUAN Xiaoguang, XU Zhongshan, LEI Meike, et al. Effect of deep cryogenic treatment on microstructure and properties of WE43A dissimilar repair welding joints[J]. Eletric Welding Machine2019, 49(12): 86-90. DOI：

摘要

针对不同深冷处理对WE43A镁合金TIG焊异质补焊接头组织和性能的影响进行研究。结果表明

与焊态相比

随深冷时间的延长

深冷处理后WE43A镁合金异质接头的晶粒逐步细化且第二相从基体和晶界中析出。深冷处理后W43A镁合金TIG焊焊补接头的显微硬度变大

其耐蚀性有所提高

晶粒细化率最高可达54.4%

焊缝区显微硬度增大25.3%。综合来看

选用-100℃×8 h深冷处理工艺最优。

Abstract

The effects of different cryogenic treatments on the microstructure and properties of dissimilar repair welding joint of WE43 A magnesium alloy by TIG welding are studied. The results show that comparing with the as-welded

as the deep cryogenic time extends

after the deep cryogenic treatment

the grains of the dissimilar welded joints of WE43 A magnesium alloy are gradually refined and the second phase precipitates from the matrix and the grain boundary

and the microhardness of WE43 A magnesium alloy TIG welding repair joint increases

its corrosion resistance improves

the grain refinement rate can reach 54.4%

and the microhardness of weld metal zone increases by 25.3%. In general

the-100 ℃× 8 h deep cryogenic process is the best.