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通过焊接热影响区最高硬度试验和斜Y型坡口焊接裂纹试验,分析了30 mm厚Q960E调质高强钢板的焊接性,在此基础上优化了焊接工艺,采用熔化极混合气体保护焊进行钢板对接多道次焊接。研究表明,预热120℃时,钢板的淬硬倾向较小,表面和断面裂纹率均为零。焊缝区显微组织为细小的马氏体和针状铁素体,粗晶区组织为粗大板条马氏体,细晶区组织为细小的马氏体和贝氏体。焊缝的硬度高于母材,粗晶区的硬度最高;焊缝的冲击吸收功与母材相当,热影响区的冲击吸收功低于母材;焊接接头的抗拉强度与母材相当。
Based on the test of maximum hardness in the heat-affected zone (HAZ) and the crack test of inclined Y-groove, the weldability of 30 mm thick Q960E quenched and tempered high strength steel was analyzed. Based on this, the welding process was optimized. The molten metal mixed gas shielded welding Docking multi-pass welding. The results show that when the preheating temperature is 120 ℃, the hardening tendency of the steel plate is smaller and the surface and cross-sectional crack rate are zero. Weld seam microstructure of small martensite and acicular ferrite, coarse-grained zone of coarse lath martensite, fine-grained zone of fine martensite and bainite. The hardness of the weld is higher than that of the base metal, and the hardness of the coarse grain zone is the highest. The impact absorption energy of the weld is equivalent to that of the base metal, and the impact absorption of the heat affected zone is lower than that of the base metal. The tensile strength of the welded joint is comparable to that of the base metal.