Stress corrosion susceptibility of 6005A-T6 aluminum alloy welded joints prepared by friction stir welding and metal-inert gas welding

NIU Xujing; LU Erjing; YU Zhikai

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Stress corrosion susceptibility of 6005A-T6 aluminum alloy welded joints prepared by friction stir welding and metal-inert gas welding
Vol. 48, Issue 3, Pages: 86-91(2018)
Published：2018
DOI：
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DOI：

NIU Xujing, LU Erjing, YU Zhikai. Stress corrosion susceptibility of 6005A-T6 aluminum alloy welded joints prepared by friction stir welding and metal-inert gas welding[J]. Eletric Welding Machine2018, 48(3): 86-91. DOI：

摘要

通过对6005A-T6铝合金型材分别进行搅拌摩擦焊及MIG焊

制备出两种不同焊接方法下的应力腐蚀敏感性试样

比较分别暴露到试验环境中和惰性环境中的相同试样来评定应力腐蚀破裂的敏感性。若比值偏离越远

则开裂敏感性越高。结果表明:搅拌摩擦焊应力腐蚀敏感系数与MIG焊存在显微差别

系数分别为0.956

0.963

且二者均未在3.5%NaCl溶液中表现出应力腐蚀倾向;通过微观断口SEM分析可知

两种接头在惰性环境和腐蚀环境中断口SEM形貌上未发现脆性断裂特征

断口形貌以塑性断裂形成的韧窝为主。

Abstract

In this paper

specimens of stress corrosion susceptibility under different welding processes were prepared by friction stir welding and MIG welding

on 6005 A-T6 aluminum alloy profiles respectively and exposed to the same test environment and inert environment

The method of comparison was used to assess the susceptibility to stress corrosion cracking. The farther the ratio deviates

the higher the susceptibility to cracking. It was shown that there was a slight difference between the stress corrosion susceptibility of friction stir welding and that of MIG welding

the values were 0.956 and 0.963

respectively

and neither of them showed stress corrosion tendency in 3.5% Na Cl solution. It would be seen that there was no brittle fracture characters on the SEM images of the two kinds of joints in the inert environment and the corrosive environment. The fracture morphology was dominated by dimples formed by plastic fracture.