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X80管线钢复合型坡口多道焊的T_8/5研究

Investigation on the T_8/5 of Multi-pass Compound Groove Welding for X80 Pipeline Steel

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【Author】 Bai Shiwu~(1,3),Tong Lige~2,Sui Yongli~3,Wang Li~2,Kang Qilan~2 (1.School of Materials Science and Engineering,Tianjin University,Tianjin,300072,China;2.School of Mechanical Engineering,Beijing University of Science and Technology,Beijing 100083,China;3.Pipeline Research Institute of China National Petroleum Corporation,Langfang 06500,Hebei,China)

【机构】天津大学材料科学与工程学院；中国石油天然气管道科学研究院；北京科技大学机械工程学院；

【摘要】焊接热输入和冷却时间是影响焊接温度场分布的重要参数。本文利用有限元软件ANSYS对X80管线钢复合坡口多道焊的焊接过程进行二维模拟,研究每道填充焊层T_8/5的变化规律。结果表明,热输入对T_8/5的影响最大;T_8/5随热输入的增加而增大;由于前一道焊对后一道焊的预热作用,T_8/5随焊道数的增多而增大;当层间温度等于预热温度时,各层的T_8/5趋于一致。合理选择预热温度和层间温度可以有效控制各焊道的T_8/5。更多还原

【Abstract】 Welding heat input and cooling time are important technical parameters that affect the welding temperature distribution field.2D simulation of multi-pass compound groove of welding process for X80 pipeline steel is carried out by finite element software ANSYS,in which the distribution of T_8/5 of welding filling layer is analyzed.The results show that the effect of heat input to T_8/5 is significant.The T_8/5 becomes longer with the increase of the heat input.Because of the obvious preheat influence of the preceding pass to the following,the T_8/5 becomes longer with the increase of the weld pass quantity. When interpass temperature is equal to preheat temperature,the difference of the T_8/5 on filling layer is tended to be insignificant.The T_8/5 will be located within a reasonable range by choosing the preheat temperature and interpass temperature.更多还原