Research on layered tear defects of friction stir welded joints of 6063-T5 thick plate

DENG Qinghong; YOU Fei; WU Yong

doi:10.7512/j.issn.1001-2303.2020.08.16

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Research on layered tear defects of friction stir welded joints of 6063-T5 thick plate
Vol. 50, Issue 8, Pages: 78-82(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.08.16
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DOI：

DENG Qinghong, YOU Fei, WU Yong. Research on layered tear defects of friction stir welded joints of 6063-T5 thick plate[J]. Eletric Welding Machine2020, 50(8): 78-82. DOI： 10.7512/j.issn.1001-2303.2020.08.16.

摘要

针对板厚17.6 mm的6063-T5铝合金翅片散热器型材进行了搅拌摩擦焊接。采用光学显微镜、扫描电镜观察接头组织结构和拉伸断口

并测试接头拉伸性能。结果表明:造成焊缝表层层状撕裂缺陷的原因是氧化物聚集分布所致

氧化物层的化学成分主要为Al2O3、MgO;通过180℃×10 h焊后时效处理

接头的抗拉强度为170 MPa

为母材的106%

拉伸断裂位置在接头前进侧热影响区

拉伸断裂方式为韧性断裂。

Abstract

6063-T5 aluminum alloy finned radiator products with a thickness of 17.6 mm were successfully fabricated by friction stir welding. Optical microscope and scanning electron microscope were used to analysis the microstructures and fracture of the joint

and the tensile properties were tested. The results show that the lamellar tearing defects in the surface of the weld is caused by the oxide aggregation distribution. The chemical composition of the oxide layer is mainly Al2 O3 and Mg O. In terms of mechanical properties

the tensile strength of the joint is 170 MPa after 180 ℃

10 h aging treatment

which is 106% of the base metal

the tensile fracture location occurred at the heat affected zone of advanced side with a ductile fracture mode.