高速列车用耐候钢活性MAG焊接技术

Research on A-MAG welding of weathering resistant steel

摘要: 提出了活性熔化极气体保护焊焊接新方法,获得了高质量的活性熔化极气体保护焊焊接接头.结果表明,活性熔化极气体保护焊焊缝表面成形好、活性焊接接头内部质量高、活性焊接操作性好、活性熔化极气体保护焊相对传统熔化极气体保护焊同等焊接热输入下熔深增加,焊接接头拉伸及弯曲力学性能不降低,同时焊接接头的冲击韧性得到提高,特别是活性焊接接头热影响区的冲击吸收功得到提升,焊接接头的断口韧窝尺寸更细小.活性熔化极气体保护焊可以提高耐候钢焊接质量,改善难熔结构焊接熔深,具有工程应用价值.

Abstract: A-MAG welding was proposed to obtain the welded joints with high quality.The experiment results show that A-MAG weld appearance,internal quality of welded joint and the welding operation performance are very well.Experiments also show that the A-MAG welding can improve weld penetration, which is compared with MAG welding under the same heat input.The tensile strength and bending strength of A-MAG welded joint are not reduced,while impact strength is improved,especially in the HAZ.Dimples size in fracture appearance of A-MAG welded joint is finer.It is showed that the active MAG welding can improve the welding quality and weld penetration of weathering resistant steel,which is applicable in engineering application.