Microstructure and Mechanical Properties of Aluminum Alloy/High Strength Steel Double Beam Laser Deep Penetration Welded Joint

A new dual beam laser deep penetration welding technology for lap joint of 1.5 mm thick aluminum alloy and high strength steel was explored in this paper, and the effects of three different beam energy ratios (RS=0.25,0.33,0.5) on weld formation, interface microstructure and mechanical properties we...

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Bibliographic Details
Published inMaterials science forum Vol. 944; pp. 448 - 457
Main Authors Cui, Li, Xia, Xu, Chen, Hong Xi, He, Ding Yong, Lu, Dong Qi, Chang, Yao Qing
Format Journal Article
LanguageEnglish
Published Pfaffikon Trans Tech Publications Ltd 01.01.2019
Subjects
Aluminum alloys
Aluminum base alloys
High strength alloys
High strength steel
High strength steels
Intermetallic compounds
Lap joints
Laser beam welding
Lasers
Mechanical properties
Microhardness
Microstructure
Penetration
Weld metal
Welded joints
Welding parameters
High Strength Steel Dissimilar Alloy
Intermetallic Compound (IMC)
Aluminum Alloy
Mechanical Resistance
Laser Deep Penetration Welding
Dual-Laser Beam
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Summary:A new dual beam laser deep penetration welding technology for lap joint of 1.5 mm thick aluminum alloy and high strength steel was explored in this paper, and the effects of three different beam energy ratios (RS=0.25,0.33,0.5) on weld formation, interface microstructure and mechanical properties were studied. The result shows that under certain conditions of other parameters, double beam laser deep penetration welding process can be applied to lap joint of aluminum alloy / high strength steel with good weld shape when RS=0.25,0.33,0.5. As RS increases from 0.25 to 0.5, the penetration of the weld reduces from 575 μm to 424.2μm, the thickness of intermetallic compound (IMC) layer at the interface between aluminum alloy and weld metal reduces from 3.4 μm to 2.5 μm, the average microhardness of the IMC layer decreases from 771.1 HV to 571.9 HV, the mechanical resistance of the joint raises from 95.7N/mm to 115.2N/mm. When RS=0.5, double beam laser deep penetration welding of aluminum alloy / high-strength steel joints has the highest mechanical resistance of joints, because of the relatively good plastic ductility of the joint.
Bibliography:Selected, peer reviewed papers from the Chinese Materials Conference 2018 (CMC 2018), July 12-16, 2018, Xiamen City, Fujian, China
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.944.448