Spot welding between Aluminum Alloy and Several Kinds of Steels by Friction Stirring

Spot welding by friction stirring between aluminum alloy (AA5052) and several kinds of steels was conducted. Several kinds of steels were mild steel (270MPa of yield strength), high tensile strength steel (HTS steel, 980MPa of yield strength). The variation of cross tensile and tensile shear strengths of weld joints has the similar tendency. After shown the maximum strength, both tensile strengths decrease with increasing plunge depth. Torque, vertical load and temperature measured during welding between AA5052 and HTS steel indicate a high value more comparatively in any measurements than another one measured during welding between AA5052 and mild steel. The plastic flow like a tornado in AA5052 is caused by combining some plastic flows that had different directions.