DEFORMED REINFORCING BAR FOR ARC STUD WELDING AND ARC STUD WELDING METHOD

摘要

PURPOSE:To obtain a welded joint with high reliability by forming one end of a deformed reinforcing bar at least into a cylinder and further, working the end face thereof to a plane orthogonal to an axis of the reinforcing bar. CONSTITUTION:This is the welding process where the relation between the length Lmm of a cylindrical part 8 and the length Smm of shielding material 2 satisfies the conditional expression of the expression I. The tip 8 of a deformed reinforcing bar stud is worked into the cylinder and in accordance with the movement of the stud during stud welding, the difference between the height of a knot 4 and a rib 4', and a clearance 5 of a knot of a region 10 to interfere with the shielding material 2 is made to the extent that can be disregarded. Thus, narrowing of spatters and mechanical interference of the knot part and the rib part of the deformed reinforcing bar with a shielding inwall end part are prevented and a pressing-in action at the optimum speed and the necessary pressing-in quantity can be secured and the reliable welded joint without weld defects can be formed. By this method, since the deformed reinforcing bar whose tip is formed into the cylinder and further, which is worked so that stud welding can be performed is used, the welded joint with high reliability can be produced by arc stud welding.