Effect of mechanical work on joint properties of SUS304 stainless steel friction weld joint

Friction welding of stainless steel SUS304(JIS) was carried out in order to examine the effects of mechanical work caused by rotation and axial pressure on the joint performance such as tensile strength. The mechanical work could be classified into two parts of work, that is, friction work and deformation work. During friction welding, the upsetting quantity and the friction torque were measured and recorded, and the deformation work and the friction work as a mechanical work were calculated using these upsetting and torque data. Tensile test was carried out to evaluate the joint performance and the relationship between the joint performance and the mechanical work was examined. The results showed that increasing the friction pressure and decreasing the friction speed caused an increase in the mechanical work and in the area of adhesive friction surface. Furthermore, increasing the mechanical work caused an increase in the tensile strength of the weld joints. But, the friction work, one of the mechanical work, did not directly relate to an increase in the tensile strength, meanwhile the deformation work was a dominant factor for controlling the friction weldability.