The heat exchanger sealing problem solving

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With my experience is the first weld after the expansion, busy died, which have the time to watch the Olympic Games, have to make money to live

Should be welded after the expansion, out of consideration
1, the welding stress is much greater than with expansion of the expansion of residual stress.
2, strength welding finger to ensure that the heat transfer tube and tube plate connection of the sealing performance and tensile strength of the welding

I think it is the first expansion, the Olympic participants must see ah, the Chinese team 66

After welding

General selection of welding prior to expansion, because the first expansion, the welding nozzle, due to heating, air gap will make the difficult welding seam, as a result. Single plate is OK, if it is double plate, the best equipment strength expansion. Before the formal expansion of test to determine the appropriate expansion parameter