| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently distribute solder on the outer circumference of the end part of a piping so as to have sufficient joint strength and perform correct positioning in the radial direction of the piping against a member to be fitted by forming a plurality of recessed parts reaching the end face on the outer circumference of the end part of the piping so as to be filled with solder at intervals in the circumferential direction. SOLUTION: A member to be fitted 1 is formed out of an annular part 3 and a cylindrical part 4 projecting from the outer circumference, the inner circumference of the insert hole 4a formed on the inner circumference of the cylindrical part 4 is formed with step difference, the extreme end side of the cylindrical part 4 is formed with larger inner diameter than the root side, and soldering is executed through solder between the inner circumference and the outer circumference of the end part of an inserted piping 5 made of aluminum series material. An eye bolt 6 inserted into the annular part 3 of the member to be fitted 1 is screwed in the female screw formed on the inner circumference of a piping 7, and both pipings 5, 7 are communicated to each other through the passage 6a of the bolt 6. Further on the outer circumference of the end part of the piping 5, three recessed parts reaching the end face at equal intervals are formed in the circumferential direction so as to be filled with solder.
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