| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding structure and a welding method for an aluminum accumulator capable of reducing welding failure, high in productivity, and a heat exchanger. SOLUTION: The welding structure comprises an aluminum pipe 4 having a beading processing part 3a, the aluminum accumulator 5 and a metal pipe 6 having a pipe-shrinking processing part 3c, in which the pipe-shrinking processing part 3c of the metal pipe 6 is inserted to the aluminum pipe 4, and the aluminum pipe 4 with the metal pipe 6 inserted thereto is inserted to the aluminum accumulator 5 up to the beading processing part 3a, and the aluminum pipe 4, the aluminum accumulator 5 and the metal pipe 6 are mutually welded at the circumference of an overlapping connection part 7. According to this, the welding failure can be reduced, and the productivity can be improved. COPYRIGHT: (C)2007,JPO&INPIT
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