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焊缝的真空试验亦称真空盒试验或真空罩试验，是工程焊接中常用的无损检验方法之一，特别适合于储罐底板等单面不可及焊缝的致密性检查。真空盒上一般设有抽气管和阀门、放空管和阀门以及真空计量表。放空管的作用是在试验结束后使真空盒和大气连通，以方便地移动真空盒；...
Also known as the vacuum test weld seam vacuum chamber test or vacuum cover test is one of the commonly used non-destructive testing methods in engineering welding. It is especially suitable for the tightness inspection of single-sided weld seams such as the tank floor. The vacuum box is generally provided with suction pipes and valves, vent pipes and valves and vacuum gauges. The role of the vent tube is to allow the vacuum chamber to communicate with the atmosphere after the test to facilitate easy removal of the vacuum chamber; ...