| 摘要 |
PROBLEM TO BE SOLVED: To provide a joining body including an adequate strength.SOLUTION: A joining body 10 includes a first metal tube 21, a second metal tube 22, and a joint portion in which end faces of the first and second metal tubes are joined. In a joint interface 11 of the joint portion between the first metal tube 21 and the second metal tube 22, a dendrite layer 15 does not exist in a region inside outer peripheral faces of the first and second metal tubes 21, 22 and outside inner peripheral faces of the first and second metal tubes 21, 22.SELECTED DRAWING: Figure 5 |
