细晶Q420C高强板作为新一代细晶钢铁材料的一种，通过组织细化和相变控制技术，获得极细的晶粒组织，因此具有良好的强度同韧性匹配，被广泛应用于输电铁塔制造、工程机械、桥梁建筑、车辆船舶等领域。

Fine grained Q420C high strength plate as a new generation of fine grain steel materials, control technology through the refinement of microstructure and phase transformation, grain is very fine, so it has good strength and toughness, and is widely used in the transmission tower manufacturing, engineering machinery, bridge construction vehicles, ships and other fields.

此对CO2气体保护焊条件下获得的细晶Q420高强钢焊接接头组织与性能进行研究具有重要的工程价值。本文对细晶Q420C高强板进行了CO2气体保护焊焊接，分析表征了焊接接头的显微组织，并对接头拉伸、弯曲、冲击性能进行了研究，以期对细晶高强钢的焊接应用提供参考。实验用Q420钢板为控扎控冷工艺制造。

The microstructure and properties of Q420 high strength steel welded joint obtained by CO2 gas shielded arc welding are of great engineering value. In this paper CO2 gas welding of fine grained Q420C high strength plate, analysis and characterization of the microstructure of welded joint, and the joint tensile, bending and impact properties were studied, in order to provide reference for application of fine grained high strength steel welding. Manufacture of Q420 steel plate for controlled cooling process.

采用CO2气体保护焊焊接细晶Q420C高强板，选择ER55-G焊丝所得焊接接头焊缝金属具有比母材更高的强度，焊接接头经180°冷弯后无裂纹等缺陷产生。细晶Q420C高强板焊缝和热影响区断口均为韧窝状延性断裂，相比较焊缝金属由于细晶Q420钢极高的洁净度和组织均匀性，以及较小的焊接线能量选择，其焊接接头热影响区具有更好的冲击性能。

Using CO2 gas shielded arc welding of fine grain Q420C high strength plate, select ER55-G welding wire from the weld metal has higher strength than the base metal, welded joint by 180 degrees cold bending and no crack and other defects. Fine grained Q420C high strength plate weld and HAZ fracture to dimple ductile fracture, compared to weld metal due to cleanliness and organization of fine grain Q420 steel with high uniformity, and the choice of welding line energy is smaller, the impact performance of the joint welding heat affected zone has better.

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