| 摘要 |
PURPOSE:To attach inexpensively and easily fittings to a base metal by bringing the contact part of the fittings into contact with the base metal, inserting stud bolts each having a welding part and a melt-cutting part into the through-holes of the contact part and welding only the welding parts to the base metal. CONSTITUTION:A stud bolt 18 is formed of a circular cylindrical gripping part 17a, a small diameter melt-cutting part 17b and a welding part 17c having the same diameter mounted to a holder. Plural through-holes 16 having the diameter slightly larger than the diameter of the part 17c are provided in the contact part 16 of a fitting 14 and the fitting 14 is placed to the prescribed position of a base metal 4 via the contact part 16. Each stud bolt 18 is then inserted into each hole 16 by a holder and the top end of the part 17c roughened to a circular conical shape by a grinder is brought into contact with the metal 4. Welding current is conducted between the bolt 18 and the metal 4 via the holder to weld the entire part of the part 17c and to melt-cut the bolt 18 in the part 17b, thereby welding the part 15 to the metal 4. |
