焊件中的温度场分布反映了复杂的焊接热过程，是研究焊接变形、焊后残余应力等状况的基础。
Temperature field distribution of weldment, which reflects complex welding heat process, is a basic on studying welding deformation, residual stress and so on.
其计算难点是建筑结构在环境温度作用下的温度场的建立与对应的温度应力和温度变形的计算。
The difficulties of calculation are to establish the temperature field of structure under the action of ambient temperature and to calculate the thermal stress and thermal deformation.
计算时把温度场和热变形作为结构应力计算的边界，获取活塞镶圈在热负荷状态下的综合应力场。
The temperature field and thermal deformation of the piston and ring carrier was used as the boundary in the calculation of stress field.
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