线能量对铝/钢双光束激光焊接接头组织及性能的影响

doi:10.11896/cldb.20040193

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Abstract In order to research the connections between linear heat input and dissimlar metals welding of Al/steel, the relationships between linear heat input and welding formation, microstructure, joint performance have been researched according to the process window acquired by optimiza-ting experiments made use of dual-beam laser. The results show that inappropriate linear heat input will result in pothole on weld surface or invalid jointing, while both laser power are few alteration when the welding velocity surpass 0.05 m/s. Linear heat input is directly proportional to penetration, but has no correlation with melting width. The fracture location of linear low heat input joint is at the interface of alumnium and dual-phase steel with shear strength of 130.70 N/mm. While the fracture of high linear heat input joint emerges in alumnium weld with the shear strength of 35.76 N/mm. The microstructure at low linear heat input is consists of lath martensite, and lowest and highest micro-hardness are found in the center of weld and HAZ respectively, but for high linear heat input joint, the microstructure is make up of martensite with coarse columnar crystals and flakes, and the lowest micro-hardness zone of high linear heat input joint is appear in fusion line. The area effectted by main and auxiliary beams occupies two in three of weld area at high linear heat input, which bigger than that area at low linear heat input.

Key words： dual-beam welding welding formation joint performance microstructure linear heat input

Published: 28 January 2021

CLC number:

TG442

Fund:The GDAS Project of Science and Technology Development (2017GDASCX-0411, 2019GDASYL-0501011, 2018GDASCX-0803), Guangdong Provincial Science and Technology Plan Projects (2019A050508006, 2018A050506058).

About author:: Shanguo Han,Ph.D student, Engineer. From 2012, he has been engaged in the research of laser welding at Guangdong Welding Institute since 2012.
Yongqiang Yang, the professor and doctoral supervisor of South China University of Technology. His research interests are metal 3D printing technology and medical applications, laser additive manufacturing and processing technology, modern welding technology.

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	HAN Shanguo
	YANG Yongqiang
	LUO Ziyi
	CAI Detao
	ZHENG Shida

Cite this article:

HAN Shanguo,YANG Yongqiang,LUO Ziyi, et al. Effect of Linear Heat Input on Microstructure and Performance of Joint Conducted by Dual-beam Laser Welding[J]. Materials Reports, 2021, 35(2): 2109-2114.

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http://www.mater-rep.com/EN/10.11896/cldb.20040193 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2109

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