双丝-单丝自动埋弧焊接头性能比较

Comparison of welded joint properties between double wires and single wire automatic submerged arc welding process

采用双丝和单丝自动埋弧焊焊接工艺进行焊接,观察了焊接接头截面形状和金属显微组织,并对其进行了冲击及拉伸试验。结果表明,采用双丝自动埋弧焊工艺焊接的接头质量好、焊缝成形美观、接头性能满足技术要求、热影响金属的成分偏析现象减弱,但焊缝金属容易产生魏氏组织,使焊缝金属的冲击性能降低。

The single wire and double wires automatic submerged arc welding processes were carried out,respectively. The cross-section configuration and microstructure of welded joint were observed,the impact toughness and tensile strength were measured. The results show that the welded joint quality of double wire automatic submerged arc welding process is good,and the weld formation is perfect,the joint properties meet to operating requirement, component segregation of heat affected zone is degraded gradually. But widmanstaten structure is formed easily in weld metal by double wire automatic submerged arc welding process, the impact toughness of weld metal is lower than that of single wire automatic submerged arc welding process.