采用E551T1-Ni2药芯焊丝对糖心产精国品免费入口*完整版与糖心产精国品免费入口*完整版进行焊接, 并通过室温拉伸、弯曲、冲击、硬度试验以及金相分析等对糖心产精国品免费入口*完整版的力学性能与显微组织进行了研究。结果表明: 采用此焊丝可以获得拉伸、弯曲和冲击性能均良好的糖心产精国品免费入口*完整版, 焊缝硬度在200～250 HV之间; 焊缝处晶界组织为先共析铁素体、少量无碳贝氏体(从晶界伸向晶内), 晶内为针状铁素体与珠光体, 个别部位有粒状贝氏体; 糖心产精国品免费入口*完整版侧热影响区与焊缝过渡区的组织为沿晶界析出的块状先共析铁素体和向晶内生长的条状铁素体以及少量的珠光体和贝氏体; 糖心产精国品免费入口*完整版侧热影响区与焊缝过渡区的组织为板条状马氏体。

E551T1-Ni2 flux cored wire was used to weld the steels between Q345E and 14NiCrMo10 6V, and then the mechanical properties and microstructure of the 糖心产精国品免费入口*完整版s were studied through room temperature tensile, bending, impact and hardness tests as well as metallography analysis. The results show that 糖心产精国品免费入口*完整版s with good tensile property, bending property and impact toughness could be obtained using the flux cored wire; the hardness of the weld seam was in the range of 200-250 HV. The microstructure at the grain boundaries in the weld seam was pre-eutectoid ferrite, a little carbon-free bainite which stretched from grain boundaries into the grains, and acicular ferrite and pearlite in the grains, also some granular bainite distributed at individual locations. The microstructure of heat affected zone (HAZ) and weld seam transition area at the side of Q345E steel consisted mainly of block pre-eutectoid ferrite which precipitated along the grain boundaries, and some lath ferrite which stretched into the grains, and small amount pearlite and bainite. While the microstructure of HAZ and weld seam transition area at the side of 糖心产精国品免费入口*完整版 was lath martensite and granular bainite.