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Research on the Microstructure and Properties of AZ31B Magnesium Alloy CMT Cycle Step Welded Joint
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Changjun Huang1, Weineng Tang1, Lei Wu1, Mingming Han2
Automobile Technology & Material | 2025, (6) : 15 - 20
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Automobile Technology & Material | 2025, (6): 15-20
Research on the Microstructure and Properties of AZ31B Magnesium Alloy CMT Cycle Step Welded Joint
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Changjun Huang1, Weineng Tang1, Lei Wu1, Mingming Han2
Affiliations
  • 1 Technology Center, Baosteel Metal Co., Ltd., Shanghai 200940
  • 2 Welding Business Unit, Fronius Intelligent Equipment (Shanghai) Co., Ltd., Shanghai 200940
Published: 2025-06-20 doi: 10.19710/J.cnki.1003-8817.20240407
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This paper investigates the microstructure, mechanical properties and elemental distribution of welded joints using the CMT Cycle Step process with AZ81 filler wire for AZ31B magnesium alloy extruded plates to develop new welding technologies for magnesium alloys. Comprehensive characterization is performed through optical microscopy, Vickers hardness tester, tensile testing machine, Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS). The experimental results demonstrate that uniform and regular fish-scale patterns are formed on the weld surface. The weld zone primarily consists of α-Mg phase with discontinuous eutectic structures at grain boundaries. While Zn element distribution shows no significant concentration difference across the base metal, fusion zone, and weld zone, Al element exhibits markedly higher concentration in the weld region compared to the base material. The maximum hardness is observed in the weld zone, with a distinct softening phenomenon characterized by significant hardness reduction in the Heat-Affected Zone (HAZ). The tensile strength of the welded joint reaches levels comparable to the base material. Tensile fractures occur in the HAZ, presenting pure shear fracture surfaces with morphological features indicative of ductile fracture characteristics.

Magnesium alloy  /  CMT Cycle Step process  /  Metallographic structure  /  Mechanical properties  /  Fracture morphology
Changjun Huang, Weineng Tang, Lei Wu, Mingming Han. Research on the Microstructure and Properties of AZ31B Magnesium Alloy CMT Cycle Step Welded Joint[J]. Automobile Technology & Material, 2025 , (6) : 15 -20 . DOI: 10.19710/J.cnki.1003-8817.20240407
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doi: 10.19710/J.cnki.1003-8817.20240407
  • Online Date：2025-11-03
  • Published：2025-06-20
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    1 Technology Center, Baosteel Metal Co., Ltd., Shanghai 200940
    2 Welding Business Unit, Fronius Intelligent Equipment (Shanghai) Co., Ltd., Shanghai 200940
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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