分别采用埋弧焊、药芯焊丝CO2气体保护焊和焊条电弧焊工艺对DH36耐蚀船板钢进行对接焊, 然后在模拟油船货油舱下底板的腐蚀环境中进行腐蚀试验, 研究了焊接工艺对焊缝金属组织和耐蚀性能的影响。结果表明: 在3种焊接工艺下, 焊缝金属的组织均主要由先共析铁素体、侧板条铁素体和针状铁素体组成; 与焊条电弧焊和气体保护焊相比, 采用埋弧焊得到的焊缝金属的耐蚀性能最优, 这源于埋弧焊较高的热输入导致针状体素体数量减少; 在三种焊接工艺下, 焊缝金属中夹杂物的尺寸、分布均相似, 它们对焊缝金属耐蚀性能的影响基本相同。

Corrosion resistant ship plate steels DH36 were welded by using submerged-arc welding, flux cored wire CO2 gas shielded welding and shielded metal arc welding processes, and then corrosion experiments were carried out in the simulated environment around bottom plates of cargo oil tanks, the effects of welding processes on microstructure and corrosion resistance of weld metals were studied. The results show that under three welding processes, microstructure of the weld metals consisted predominantly of acicular ferrite, ferrite side-plate and proeutectoid ferrite. Compared with shielded metal arc welding and gas shielded welding, the weld metal prepared by submerged-arc welding had the best corrosion resistance, this due to the decrease of proeutectoid ferrite caused by higher heat input. Under three welding processes, the size and distribution of inclusion in weld metal were similar, and there was no obvious difference in the effects of inclusion on corrosion property of weld metal.