Cause analysis and control of inclusion in 2219 aluminum alloy friction stir weld

WANG Zhiguo; DOU Chao; YIN Yuhuan; XU Kui; MA Qianlong

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Cause analysis and control of inclusion in 2219 aluminum alloy friction stir weld
Vol. 49, Issue 9, Pages: 29-33(2019)
Published：2019
DOI：
稿件说明：

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DOI：

WANG Zhiguo, DOU Chao, YIN Yuhuan, et al. Cause analysis and control of inclusion in 2219 aluminum alloy friction stir weld[J]. Eletric Welding Machine2019, 49(9): 29-33. DOI：

摘要

在2219铝合金搅拌摩擦焊焊缝中发现月牙状夹杂

通过X射线、光学显微镜、能谱分析研究其分布特征、微观形貌及化学成分

通过试验确定了夹杂形成原因

并分析其形成机理和对接头拉伸性能的影响。结果表明:月牙状夹杂是由诸多异常长大的Al

Cu组成

而Al

Cu的异常长大是由于焊接过程中搅拌头上存在被焊材料的滞留

Cu在高温下发生了粗化

随着焊接的进行

粗化的Al

Cu随机剥落到焊缝中

在搅拌头的作用下形成月牙状夹杂;通过改进搅拌头结构可以避免夹杂。拉伸测试结果表明

夹杂对接头的拉伸性能没有影响。

Abstract

Crescent-shaped inclusion was found in the friction stir weld of 2219 aluminum alloy

X-ray detection

optical microscopy and energy spectrum analysis were used to study the distribution characteristics

microstructure and chemical composition of inclusions. The cause of inclusion formation was determined by experimental verification. At last

the influence of inclusion formation mechanism and tensile properties on joints was analyzed. The results show that the inclusions were composed of many abnormally grown Al

Cu particles. The abnormal growth of Al

Cu was due to metal material attached at the thread and the groove of friction stir weld tool during the welding process. Al

Cu particles coarsened under high temperature

Al particles were segregated and peeled off into the weld during welding randomly

the separated Al

Cu formed crescent-shaped inclusion under the action of friction stir weld tool. Crescent-shaped inclusions could be avoided by improving friction stir weld tool structure. It was found by tensile test that the inclusion had no effect on the tensile properties of the joint.