Welding Quality Control of 9%Ni Steel for Large LNG Storage Tanks
Taking the 220000 square meters of large-scale LNG storage tanks under construction in China as an example,this paper elaborates the key points of quality control of 9%Ni steel welding,and analyzes the quality control of base metal of 9%Ni steel welding,welding consuma-bles management,welding method,welding evaluation and non-destructive testing.The advantages and disadvantages,easy defects and preven-tive measures of 9%Ni steel manual arc welding and automatic TT welding are briefly compared,and the quality control of the welding process is summarized and analyzed.The results show that strict control of the welding heat input of manual arc welding 9%Ni steel is the key measure to prevent crack defects,and manual arc welding 9%Ni steel should be multi-layer multi-pass welding as much as possible,and the interlayer temperature should be controlled below 100℃.Compared with manual arc welding,automatic TT welding weld forming has a beautiful appear-ance,higher qualification rate of one weld,strong traceability of process parameters of the welding process,and less smoke and dust generated by welding,which improves the occupational health of welders.
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