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細晶Q420C高強板作為新一代細晶鋼鐵材料的一種，通過組織細化和相變控制技術，獲得極細的晶粒組織，因此具有良好的強度同韌性匹配，被廣泛應用于輸電鐵塔制造、工程機械、橋梁建筑、車輛船舶等領域。

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.

此對CO2氣體保護焊條件下獲得的細晶Q420高強鋼焊接接頭組織與性能進行研究具有重要的工程價值。本文對細晶Q420C高強板進行了CO2氣體保護焊焊接，分析表征了焊接接頭的顯微組織，并對接頭拉伸、彎曲、沖擊性能進行了研究，以期對細晶高強鋼的焊接應用提供參考。實驗用Q420鋼板為控扎控冷工藝制造。

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氣體保護焊焊接細晶Q420C高強板，選擇ER55-G焊絲所得焊接接頭焊縫金屬具有比母材更高的強度，焊接接頭經180°冷彎后無裂紋等缺陷產生。細晶Q420C高強板焊縫和熱影響區斷口均為韌窩狀延性斷裂，相比較焊縫金屬由于細晶Q420鋼極高的潔凈度和組織均勻性，以及較小的焊接線能量選擇，其焊接接頭熱影響區具有更好的沖擊性能。

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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