请教一下高手,我做的焊接热分析,刚第二步就说The value of TEMP at node 29310 is 1281764.35. It is greater than the current limit of 1000000. This generally indicates rigid body motion as a result of an unconstrained model. Verify that your model is properly constrained. 怎么热分析的还会出现刚体位移呢?