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

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)。

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 T8/5 of welding filling layer is analyzed. The results show that the effect of heat input to T8/5 is significant. The T8/5 becomes longer with the increase of the heat input. Because of the obvious preheat influence of the preceding pass to the following, the T8/5 becomes longer with the increase of the weld pass quantity. When interpass temperature is equal to preheat temperature, the difference of the T8/5 on filling layer is tended to be insignificant. The T8/5 will be located within a reasonable range by choosing the preheat temperature and interpass temperature.