If inlet end adopt socket weld and outlet end adopts threaded connection, use " U " to express connection unit " S ". 如进口端采用承插焊(SW),出口端采用螺纹,则连接单元“S”用“U”表示。
Analysis of Socket Fillet Weld Defect in Domestic 600 MW Unit Heat Exchanger 国产600MW机组高加管座焊接缺陷分析