为了充分认识高屈强比、高强度低温材料焊接裂纹的敏感性，通过对NK-HITEN610U2L低合金高强度钢球罐支柱角焊缝裂纹的检测、解剖对比和成因分析，发现焊缝外表面缺陷与内部焊接缺陷存在一定关系，高应力设计部位比较突出，因此检测与焊接要引起高度注意。

The nondestructive testing, anatomy contrast and reason analysis for welding cracks in the ball pot stanchion of NK-HITEN610U2L low alloy and high strength steel were put up. The results showed that there were some relations between the surface welding defects and the internal welding defects, especially in the high stress design position, that should be attentive in the process of inspection and weld.