年产30万吨乙烯工程,有五台大型塔器设备须在施工现场拼装焊接。 拼装焊接产生的焊接残余应力是有害的,残余应力的存在增加了设备脆性破坏的危险性。残余应力与焊缝残存的氢结合是造成热影响区的硬化区冷裂纹及延迟裂纹的原 With an annual output of 300,000 tons of ethylene project, there are five large tower equipment must be assembled at the construction site welding. Residual welding stress welding residual stress is harmful, the presence of residual stress increases the risk of brittle destruction of equipment. Hydrogen residual stress and weld residual hydrogen is the result of the heat affected zone hardened zone cold crack and delayed crack of the original