Substituting inner-hole welding construction for traditional end surface welding construction is a fundamental method for raising the stabilities of anti-stress corrosion and anti-slit corrosion.

• 用内孔焊结构代替传统的端面焊结构是提高换热器管子与管板焊接接头抗应力腐蚀和缝隙腐蚀稳定性的根本途径。