Journal
OPTICS AND LASERS IN ENGINEERING
Volume 48, Issue 7-8, Pages 732-736Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2010.03.015
Keywords
Dual-beam laser welding; Steel; Aluminum alloy; Intermetallic compound; Shearing strength
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The lap welding of JSC270CC steel and A6111-T4 aluminum alloys were carried out by a dual-beam YAG laser with the continuous wave (CW) and pulse wave (PW) modes. The microstructure of the welded joints were examined with SEM, EPMA while the properties were checked with microhardness tester and tensile testing machine. It was shown that the dual-beam laser welding can effectively reduce or avoid the formation of the blowholes in the welded joints. The PW laser beam penetrated the welding pool, leading to the root-shape structures with enhanced bonding strength at the weld interface. A 10 mu m intermetallic compound (IMC) layer was generated at the interface. The shearing strength of lap joint was measured to be 128 MPa. (C) 2010 Elsevier Ltd. All rights reserved.
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