Evaluation of Joint Performance of 5056 Aluminum Friction Welded Joints by Heat Input and Burn-Off Quantity

摘要

Friction welding of 5056 aluminum alloy similar material was carried out in order to examine the relationship between heat input and joint performance. The joint performance is evaluated by tensile test. The heat input is a heat source for welding solid materials and is classified into six categories, viz. friction heat input and deformation input during friction stage, upset stage and total stage. The most important heat input for evaluating the joint performance among these heat input was experimentally investigated through the tensile strength of welded joints because the friction mechanism is much complex. It was found that the deformation heat input during the upset stage was correlated well with the joint performance, and the sound joints were obtained with the deformation heat input over 100J/s. Moreover, it was recognized that the sound joints coul be obtained with upset burn-off length over 2mm.