热输入对AZ31B镁合金/PRO500超高强钢TIG熔-钎连接特性的影响*

doi:10.11896/j.issn.1005-023X.2017.010.012

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Abstract Experiments of TIG welding-brazing of AZ31B magnesium alloy and PRO500 steel were carried out to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. The results indicated that a effective bonding achieved between AZ31B magnesium alloy and PRO500 steel by TIG welding-brazing method. Under a optimized current process parameters, the strength of the joint could reach 85% of the Mg alloy base metal. The transition zone in the interface was formed including the formation of the Fe-Mg-O compounds, the AlFe3 intermetallic compound (IMC), and the cross diffusion of the elements Fe and Mg from the substrate. The fracture mode of AZ31B/PRO500 joint presented a mixed-rupture characteristics of quasi-cleavage and tearing at a smaller heat input. With the increase of welding current, the fracture mode changed to a brittle rupture with the lea-ding role of the quasi-cleavage fracture. Then the bonding strength decreased obviously.

Key words： heat input magnesium alloy ultra-high strength steel welding-brazing characteristic

Published: 08 May 2018

CLC number:

TG47

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	CHEN Jianhua
	ZHANG Xiyan
	REN Yi

Cite this article:

CHEN Jianhua,ZHANG Xiyan,REN Yi. Influence of Heat Input on the TIG Welding-brazing Bonding Characteristics of AZ31B Magnesium Alloy/PRO500 Ultra-high Strength Steel[J]. Materials Reports, 2017, 31(10): 56-60.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.010.012 OR http://www.mater-rep.com/EN/Y2017/V31/I10/56

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