Virgo104铸钢及焊接接头力学性能研究

INVESTIGATION ON MECHANICAL PROPERTIES OF VIRGO 104 CASTING STEEL AND ITS WELDS

对Virgo104钢的力学性能进行了检验,并研究了与之匹配的两种气保焊焊丝及一种焊条的焊接接头力学性能。试验结果表明,Virgo104钢中心与表面的力学性能基本一致,具有良好的强度与塑性匹配,而且具有优良的低温冲击韧度,特别是其高的Wp/Wi（约3.0）及高的侧向膨胀率（约15％）,表明该钢具有优良的抗脆性断裂性能。焊缝金属及焊接接头具有良好的力学性能,其中HS367L焊丝的焊缝金属,在焊态下具有较高的塑性,预示出较高的抗焊接裂纹性能。

Mechanical properties of Virgo 104 casting steel and its welds with two kinds of MIG wires and one covered electrode are investigated. The results indicate that mechanical properties at the center of tested piece of Virgo 104 steel are same as that of the surface, and having an excellent combination of tension strength and ductility. The high impact toughness at low temperature, especially the higher Wp/Wi (-3.0) ratio and lateral expansion (-15%) of Virgo 104 show its excellent resistance to brittle fracture. The weld metal and welded joints show good comprehensive mechanical properties, and especially the weld metal with HS367L MIG wire compared with other welding consumables, shows higher ductility on welded condition, which indicates the higher resistance to welding cold cracking.