FRICTION STIR WELDING METHOD FOR STRUCTURAL STEEL AND MANUFACTURING METHOD FOR BONDED JOINT FOR STRUCTURAL STEEL.

摘要

The purpose of the present invention is to advantageously address reverse flow failures due to insufficient heating of materials to be processed when carrying out friction stir welding of structural steel, to give sufficient strength, and also to improve connection construction. In the present invention, a preheating treatment process is carried out during friction stir welding of structural steel, said preheating treatment process being a process wherein a steel plate (3), which is the material to be processed, is heated by a heating means (5) provided forward of a rotary tool (1) that moves in a joining direction. The present invention is configured so that the surface temperature, surface area, position, and the like for the heating region in the preheating treatment process are strictly controlled.