Effects of inclination angle of faying surface on the mechanical properties of friction welded joints of 5052 aluminum alloy

摘要

Effect of inclination of faying surface on themechanical properties of 5052 aluminum alloy joints, which werewelded by a brake type friction welding machine, has beeninvestigated. The inclination angle of faying surface to thespecimen axis was 0beg to 25beg. The axial shortening increases atfirst rapidly and then slowly with increase in the welding time. It isfound that the initial axial shortening speed increases withincreasing the inclination angle. Regardless of the friction time,both burn off length and total loss increased with increasinginclination angle. Heat affected zone of welded joints becamenarrower with increasing inclination of faying surface. Theinclination of faying surface had no effects on the microstructuresof joint. Hardness of weld zone was lower than that of the basemetal. The width of softening zone tended to decrease withincrease in the inclination angle. Tensile strength of the weldedjoints was 84percent as large as that of the base metal independentof the inclinatin angle of faying surface. Regardless of bothwelding condition and inclination of faying surface, the elongationof welded joints was 81percent as large as that of the base metal.All joints fractured at the heat affected zone.