Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 653, Issue -, Pages 43-52Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.11.101
Keywords
Friction stir welding; Laser; Inter-metallic compounds; Pre-hole offset distance; Tensile strength; Steel and aluminum alloy
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In this paper, the influence of pre-hole offset distance on the properties of the welding joint during laser assisted friction stir welding of Q235 steel and 6061-T6 aluminum alloy was studied. The tensile strengths of the joints obtained at different pre-hole offset distances are tested and compared. SEM, EDS and an optical microscope are used to analyze the compositions of the inter-metallic compounds and the metallographic structure of the joints, respectively. Results show that the pre-hole offset distance, the thickness of the inter-metallic compounds layer and the type of the inter-metallic compounds are the key factors that affect significantly the tensile strength of the joints in laser-assisted friction stir welding of steel and aluminum alloy. The tensile strength of joints can be easily guaranteed under such conditions as a proper pre-hole offset distance is used, thin inter-metallic compounds layer and iron-abundant inter-metallic compounds are formed. (C) 2015 Elsevier B.V. All rights reserved.
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