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AP1000反应堆压力容器的管座管穿件焊接是低合金钢、不锈钢和镍基合金的异种钢焊接。该焊缝的焊接具有空间位置复杂、焊接应力大、镍基合金导热性及流动性差的特征,焊缝中常岀现热裂纹、根部缺陷、夹渣、气孔等缺陷。本文探讨了隔离层堆焊、冷装、角焊缝填充焊的制造工艺。结果表明,优化工艺参数、选择恰当的焊材、合理的焊道布置和焊接操作方法、清洁焊接工作区域等,是获得质量良好的管座贯穿件焊缝的重要因素。该焊接技术已成功应用于AP1000项目反应堆压力容器的设备制造,结果表明该焊接工艺合理,产品质量满足要求。
Tube-to-tube welding of AP1000 reactor pressure vessels is dissimilar steel welding of low alloyed steels, stainless steels and nickel base alloys. The welding of the weld has the characteristics of complex space position, large welding stress, poor thermal conductivity and poor fluidity of the nickel-based alloy. The weld often contains defects such as hot cracks, root defects, slag inclusions and pores. This article discusses the isolation layer welding, cold loading, fillet welding process. The results show that optimizing the process parameters, selecting the appropriate welding consumables, reasonable welding track layout and welding operation methods, and cleaning the welding work area are the important factors to obtain good quality weld penetration of the tube base through-hole. The welding technology has been successfully applied to AP1000 reactor pressure vessel equipment manufacturing, the results show that the welding process is reasonable, product quality to meet the requirements.