| 摘要 |
PROBLEM TO BE SOLVED: To provide a press-contact method simple in heating operation, surely stable in joining strength, capable of simply conducting end face treatment, and even in a high frequency induction heating system, capable of sufficiently coping on the site. SOLUTION: The press-contact method is constituted by that an annular body 2 is put between end faces 1 to be joined by two steel materials W opposing to each other, and a sheet 3 made of a synthetic resin such as polyethylene and polypropylene is put therein, and the joining place is applied with a heating means such that initial heating and latter heating are conducted continuously. And in the press-contact method, as the annular body 2, a material with 1,0-4.0 mm in thickness and 2.0-5.0 mm width may preferably be used. |
