AZ31マグネシウム合金の摩擦圧接

抄録

Magnesium alloy AZ31 was friction welded using a brake type friction welding machine under argon shielding. Microstructures and mechanical properties of the friction welded joints were investigated. The fine grain structure resulting from disappearance of fibrous one is observed closely near the weld interface. The hardness of both the weld interface and heat affected zone are nearly equal to those of the base metal. The tensile strength of welded joints are improved with increasing friction time, but it is lower than that of the base metals. In case of friction pressure of 50MPa and friction time of 6 seconds the elongation of the joint shows the highest value, but it is inferior to that of the base metal. All the impact specimens with the notch into the weld interface showed impact strength inferior to that of the base metals, but impact strength increases with increasing notch distance from the weld interface. There is no trouble in flaming during the welding process.