Manual weldings of watertight joints shall be painted after the air test.
焊接水密接合应该在气密试验后进行喷漆。
2
All weldings all should conform to the correlation standard or the standard request.
所有焊接都应符合相关规范或标准的要求。
3
NC machine is used to ensure that longitudinal and circular weldings are produced at a constant speed and the welding point is always in flat position.