水下局部干法焊接用焊材的选择与应用

摘要

In order to confirm the welding material used for underwater local dry method welding, it adopted 5 kinds of flux-cored wire, including GFL-71Ni, GFL-61, MX-100T, MGS-1N and Union Ni2.5, using FCAW and multi-layer multi-pass welding technology to conduct underwater local dry method simulation welding test for E36 low alloyed high strength steel on flat position of welding, and carried out welding procedure qualification for weld seam, the weld seam was obtained through different welding material. The results indicated that relative to the other four kinds of flux-cored wire, the welded joint obtained by GFL-71Ni wire is not only with good weld forming, no defect found, the tensile strength, yield strength, the percentage elongation after fracture, the percentage reduction of area and bending performance all can meet the requirements of the standard, and the impact toughness is good, therefore the GFL-71 welding wire has more excellent welding technology under the special condition of underwater welding.%为了确定水下局部干法焊接用焊接材料，采用GFL-71Ni、 GFL-61、 MX-100T、 MGS-1N和Union Ni2.5五种药芯焊丝，使用FCAW焊接方法，多层多道焊接技术，在平焊位置对E36低合金高强度钢进行水下局部干法模拟焊接试验，并且对采用不同焊接材料获得的焊缝进行了工艺评定。评定结果表明，相对于其他4种药芯焊丝，采用GFL-71Ni焊丝获得的焊接接头不仅平焊焊缝成形较好，未发现缺陷，其抗拉强度、屈服强度、断后伸长率、断面收缩率以及弯曲性能均满足标准要求，且冲击韧性良好，因而GFL-71Ni焊丝在水下焊接的特殊条件下具有更加优良的焊接工艺性。