Experimental Research on AZ31B Magnesium Alloy Welded Using Fiber Laser with Adjustable Ring Spot

Mingjun Zhang; Lefeng Wu; Cong Mao; Jian Zhang; Kaiming Wang; Yongle Hu; Heqing Li

doi:10.3788/CJL202249.2202002

Chinese Journal of Lasers, Volume. 49, Issue 22, 2202002(2022)

Experimental Research on AZ31B Magnesium Alloy Welded Using Fiber Laser with Adjustable Ring Spot

Mingjun Zhang, Lefeng Wu, Cong Mao, Jian Zhang, Kaiming Wang, Yongle Hu, and Heqing Li^*

Hunan Provincial Key Laboratory of Key Technologies for High-Performance Intelligent Manufacturing of Mechanical Equipment, College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China

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Figures & Tables(10)

Fig. 1. Experimental setup. (a) Schematic of laser beam with adjustable ring spot; (b) fiber laser; (c) in-site layout

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Fig. 2. Schematic of tensile specimen

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Fig. 3. Macro-morphologies of welds. (a1)－(a3) 1#; (b1)－(b3) 2#; (c1)－(c3) 3#; (d1)－(d3) 4#; (e1)－(e3) 5#

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Fig. 4. Effects of laser power combination on weld width and underfill depth

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Fig. 5. Microstructures of welds. (a1)－(a4) 1#; (b1)－(b5) 2#; (c1)－(c3) 5#

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Fig. 6. Microhardness distribution of weld

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$Tensile test results of specimens. (a) Tensile curves; (b) fracture morphologies$

Fig. 7. Tensile test results of specimens. (a) Tensile curves; (b) fracture morphologies

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$Typical tensile fracture morphologies. (a1)(a2) Base metal; (b1)(b2) 1#; (c1)(c2) 2#; (d1)(d2) 5#$

Fig. 8. Typical tensile fracture morphologies. (a1)(a2) Base metal; (b1)(b2) 1#; (c1)(c2) 2#; (d1)(d2) 5#

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Table 1. Chemical compositions of AZ31B magnesium alloy
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Table 1. Chemical compositions of AZ31B magnesium alloy
Element Al Zn Mn Si Fe Cu Ni Mg
Mass fraction /% 2.960 0.520 0.310 0.160 0.003 0.006 0.001 Bal.

Table 2. Laser welding process parameters
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Table 2. Laser welding process parameters
Specimen No. Central laser power /W Ring laser power /W Welding speed /(mm/s) Defocusing amount /mm
1# 3000 0 60 ＋2
2# 2000 1000
3# 1500 1500
4# 1000 2000
5# 0 3000

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Mingjun Zhang, Lefeng Wu, Cong Mao, Jian Zhang, Kaiming Wang, Yongle Hu, Heqing Li. Experimental Research on AZ31B Magnesium Alloy Welded Using Fiber Laser with Adjustable Ring Spot[J]. Chinese Journal of Lasers, 2022, 49(22): 2202002

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