Microstructure and Tensile Properties of 6061 Aluminum Alloy/Q235 Galvanized Steel Brazing Welded Joint Prepared by Cold Metal Transfer

WANG Yan; YANG Shanglei; ZOU Yuguo; JIANG Yishuai; YANG Zhihua

doi:10.11973/jxgccl201711015

Materials and Mechanical Engineering > 2017 > 41(11): 77-81. > DOI: 10.11973/jxgccl201711015

WANG Yan, YANG Shanglei, ZOU Yuguo, JIANG Yishuai, YANG Zhihua. Microstructure and Tensile Properties of 6061 Aluminum Alloy/Q235 Galvanized Steel Brazing Welded Joint Prepared by Cold Metal Transfer[J]. Materials and Mechanical Engineering, 2017, 41(11): 77-81. DOI: 10.11973/jxgccl201711015

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Microstructure and Tensile Properties of 6061 Aluminum Alloy/Q235 Galvanized Steel Brazing Welded Joint Prepared by Cold Metal Transfer

1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2. Shanghai Sachs Powertrain Components Systems Co., Ltd., Shanghai 201708, China

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Received Date: November 15, 2016
Revised Date: October 12, 2017

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Abstract

6061 aluminum alloy and Q235 galvanized steel were butt welded by cold metal transition(CMT) brazing. The microstructure and tensile properties of welded joints were studied. The results show that the welded joint surface was well formed. The welded joint was composed of fusion zone, heat-affected zone and interface layer. The fusion zone consisted of α-Al solid solution and aluminum-silicon eutectic structure. The microstructure of heat-affected zone was coarser than that of the parent metal. Intermetallic compound (IMCs) was formed in the interface layer, the layer thickness was about 8 μm, and the layer grew unidirectionally to the melting zone. The hardness of the heat-affected zone on the side of 6061 aluminum alloy base metal was the lowest (42 HV), and the hardness of the IMCs layer was the highest (365 HV). The tensile strength of the welded joint was 161 MPa, which was about 0.69 times as that of 6061 aluminum alloy, and was improved obviously compared with lap joints.
- cold metal transition brazing,
- butt joint,
- microstructure,
- intermetallic compound layer

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Microstructure and Tensile Properties of 6061 Aluminum Alloy/Q235 Galvanized Steel Brazing Welded Joint Prepared by Cold Metal Transfer

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