WELDOX960E高强钢手工电弧焊焊接接头组织与力学性能

通过拉伸、弯曲、冲击、硬度和金相组织分析等试验,对手工电弧焊焊接WELDOX960E高强钢焊接接头组织和力学性能进行研究.研究结果表明：采用Phoenix SH Ni2 K130焊条、手工电弧焊焊接WELDOX960E高强钢时,可以获得拉伸、弯曲、冲击性能良好的接头;其焊缝组织为针状铁素体与粒状贝氏体的混合分布;熔合区及粗晶区组织为板条马氏体和少量白色M-A块区;正火区组织为块状铁素体、粒状贝氏体和珠光体;母材显微组织为回火索氏体;WELDOX960E高强钢焊缝硬度为270 ～ 300 HV,且距离熔合线30 mm处出现软化区.

Microstructures and Mechanical Properties of WELDOX960E High Strength Alloy Manual arc Welding Joint

Microstructures and properties of WELDOX960E high strength alloy manual arc welding joint were investigated by tensile,bending,impact and hardness tests and metallographic analysis.The results show that tensile,bending and impact properties of the WELDOX960E welding joint which is manual arc welded with Phoenix SH Ni2 K130 welding rods are excellent.The microstructure in the weld metal contains the mixture of acicular ferrite and granular bainite.The microstructure in the fusion zone of the welding joint contains lath martensite and a small amount of white M-A piece of area.The microstructure in the normalized zone of the welding joint contains blocky ferrite,granular bainite and pearlite.The microstructure in the parent metal contains tempering sorbite.The hardness of the WELDOX960E high strength alloy welding joint is between 270-300 HV,and a softing zone appears 30 mm away from the fusion line in HAZ.