Keyhole stability in disc laser welding of AZ31B and AZ61A magnesium alloys and weld metal properties

被引:24
作者
Wahba, M. [1 ,2 ]
Mizutani, M. [3 ]
Kawahito, Y. [3 ]
Katayama, S. [3 ]
机构
[1] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan
[2] Cent Met Res & Dev Inst, Helwan 11421, Egypt
[3] Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan
关键词
Magnesium alloys; Laser welding; Keyhole; Welding defects; Underfill; SOLID-STATE LASERS; MICROSTRUCTURE; STEEL;
D O I
10.1179/136217110X12720264008592
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To confirm the process potential and limitations of laser welding of magnesium alloys, a newly developed disc laser of 16 kW in maximum power was used to weld thin plates of AZ31B and AZ61A alloys. Melting characteristics and weld metal properties were studied under different process parameters. The very high power density of the applied beam caused the keyhole and the molten pool to be unstable. Underfill was the main welding defect limiting the process window and its formation was closely related to the keyhole instability. A process diagram indicating areas of sound and defected welds could be constructed. Sound welded joints could be obtained for AZ31B alloy with similar mechanical properties as that of the base material. The brittle intermetallics network present along the grain boundaries in AZ61A weld metals required a higher energy input to alleviate its detrimental effect on the mechanical properties of the welded joints.
引用
收藏
页码:559 / 566
页数:8
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