| 摘要 |
PROBLEM TO BE SOLVED: To apply tensile stress to the inner surface of a different material tube fitting. SOLUTION: When groove parts 9 of two outer-fitted members 5, 6 fitted to closely adhere to a welding joint 3 of pipe materials 1, 4 which are made of different materials and have the same diameter, a welded joint 10 formed between the outer-fitted members pulls the outer-fitted members 5, 6 to be close to each other. Thus, the outer contact members 5, 6 radially press the ends of the pipe materials 1, 4 through the welding joint 3 to convert the compressive residual stress field on the inner surface side of the ends of the pipe materials 1, 4 into a tensile stress field.
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