双细丝并联多丝埋弧焊接工艺试验研究

为了解决多丝埋弧焊大线能量焊接导致的高钢级管线钢焊缝及热影响区金相组织粗化、力学性能脆化的问题，设计了焊接线能量较低的双细丝并联多丝埋弧焊接工艺，在该工艺下进行了焊接试验，并在相同焊接环境下与常规粗丝四丝埋弧焊工艺进行了对比。结果表明，双细丝并联多丝埋弧焊工艺比常规粗丝四丝埋弧焊工艺焊接线能量降低约27%，显著改善了焊缝及热影响区的低温冲击韧性，两种焊接工艺下焊接接头抗拉强度的变化不大。

Experimental Study on Double Filaments Parallel Multi-wire Submerged Arc Welding Process

In order to solve the problem of microstructure coarsening, mechanical property embrittlement of high grade pipeline steel caused by multi-wire submerged arc welding high linear energy welding, the double filaments parallel multi-wire submerged arc welding process with low welding input energy was designed. The welding test was carried out by using this process, and compared with the conventional coarse-wire four-wire submerged arc welding process under the same welding environment. Compared with conventional coarse wire four wire submerged arc welding process, the welding linear energy of double filaments parallel multi-wire submerged arc welding technology reduced about 27%, significantly improved the low temperature impact toughness of weld and heat affected zone, and the tensile strength of two kinds of welding process welded joint does not change significantly.