通过外观检查、化学成分分析、力学性能测试、渗透探伤及金相检验, 对表面质量好与表面质量差的母材(合格母材与不合格母材)进行对比; 并将选用两种母材的焊接结构件在有腐蚀介质的环境下经过2 a(年)的运行试验后进行对比, 结果表明: 母材存在表面质量缺陷时, 母材及焊接接头在有腐蚀介质的环境下, 出现腐蚀现象, 产生腐蚀坑; 焊缝熔合线处的腐蚀坑在拉应力作用下产生裂纹, 形成非过载的损伤型断口; 母材不存在表面质量缺陷时, 未发生腐蚀现象, 未发现焊缝裂纹。

By means of visual inspection, chemical composition analysis, mechanical property testing, penetration testing and metallographic examination, the base metal with good surface quality and poor surface quality (qualified and unqualified parent metal) was compared; and the welded structure material with the two kinds of base metal was compared after a operation comparison test in corrosive environment for 2 years. The results showed that the phenomenon of corrosion occurred and corrosion pits were found in the unqualified parent metal and welded joints in corrosive environment; the cracks were formed in the pits on weld fusion line under tensile stress, the non-overload damage type fracture was produced; on the other hand, the phenomenon of corrosion and pits were not found in the qualified parent metal and welded joints.