High power fiber laser arc hybrid welding of AZ31B magnesium alloy

被引：49

作者：

Gao, Ming ^{[1
]}

Tang, Hai-Guo ^{[1
]}

Chen, Xiao-Feng ^{[2
]}

Zeng, Xiao-Yan ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Optoelect Sci & Engn, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Off Res & Dev, Wuhan 430074, Peoples R China

来源：

MATERIALS & DESIGN | 2012年 / 42卷

关键词：

Non-ferrous metals and alloys; Lasers; Welding; PARAMETERS; SIMULATION;

D O I：

10.1016/j.matdes.2012.05.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High power fiber laser-metal inert gas arc hybrid welding of AZ31B magnesium alloy was studied. The fusion zone consisted of hexagonal dendrites, where the secondary particle of Al8Mn5 was found at the center of dendrite as a nucleus. Within hybrid weld, the arc zone had coarser grain size and wider partial melted zone compared with the laser zone. The tensile results showed the maximum strength efficiency of 5 mm thick welds was up to 109%, while that of 8 mm thick welds was only 88%. The fracture surface represented a ductile-brittle mixed pattern characterized by dimples and quasi-cleavages. On the fracture surface some metallurgical defects of porosity and MgO inclusions around with secondary cracks were observed. Meanwhile, a strong link between the joint strength and weld porosity were demonstrated by experimental results, whose relevant mechanism was discussed by the laser-arc interaction during hybrid welding. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：46 / 54

页数：9

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