Effect of weld reinforcement on fatigue properties of A6N01 aluminum alloy welded joint

Fatigue properties of smooth and reinforcement A6N01 aluminum alloy welded joints were characterized in this paper.Based on measured S-lgN curves and fatigue fracture morphologies,effect of weld reinforcement on the fatigue property of the welded joint was studied.Results show that the weld toe is the weakness region of the reinforcement welded joint due to the stress concentration in this area,thus the fatigue fracture occurred at the weld toe for all the reinforcement welded joints;while the fatigue property of the smooth welded joint was improved due to remove of the weld reinforcement,and the welding defect was the key factor of the fatigue fracture,thus its fracture zones mainly located at welding zone and fusion line.