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为提高建造海洋采油平台的效率、减少生产周期,进而为实际生产提供数据支持,采用3种不同热输入对海洋采油平台用E36钢进行埋弧焊焊接,通过光学显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)和电子背散射衍射技术(EBSD)对焊缝微观组织及夹杂物形貌进行了观察,研究了不同热输入对焊缝组织及韧性的影响,并分析了不同热输入对焊缝夹杂物尺寸分布和成分的影响.结果表明:热输入为50 k J/cm时,焊缝金属韧性较好;随着焊接热输入的增加,焊缝的冲击韧性降低,但仍能满足性能指标,焊缝金属中夹杂物成分相差较大,有效夹杂物数量减少,焊缝金属中大角度晶界比例减少;对于E36钢,热输入为160 k J/cm时不仅能使韧性符合要求还能提高生产效率.
In order to improve the efficiency of the offshore oil production platform, reduce the production cycle and provide the data support for the actual production, three kinds of heat input were used to submerge arc welded E36 steel for the offshore oil platform. The optical microscope (OM), transmission electron microscope TEM, SEM and EBSD. The effects of heat input on the microstructure and toughness of the weld were investigated. The effects of different heat The results show that the toughness of the weld metal is good when the heat input is 50 kJ / cm, and the impact toughness of the weld decreases with the increase of welding heat input Can meet the performance index, the composition of inclusions in the weld metal is quite different, the effective inclusions are reduced, and the proportion of large angle grain boundaries in the weld metal is reduced; for the E36 steel, the heat input of 160 kJ / cm can not only make the toughness Meet the requirements but also improve production efficiency.