在换热器制造的工艺流程中 ,通常需要对换热管 (包括整根原始管、拼接管和 U型管 )进行单管试压 ,以检验原材料、对接接头或冷加工变形段是否有裂纹和泄漏。由于换热管数量巨大、规格尺寸较多 ,管端密封又缺乏一种简单快速的办法。因此 ,有些生产单位为了加快制造进度 ,往往减 In the manufacturing process of the heat exchanger, it is usually necessary to conduct a single tube test on the heat exchange tubes (including the entire original tube, the splicing tube and the U-tube) to check whether the raw material, the butt joint or the cold deformation section are cracked and leakage. Due to the large number of heat exchange tubes, size and size, pipe end seal and the lack of a simple and quick way. Therefore, some production units tend to decrease in order to speed up the manufacturing process