摘要
应用有限元方法建立了灰铸铁件手弧焊接温度场的数学模型，对灰铸件焊接温度场和热循环进行了分析。结果表明：焊后初期冷却速度很快（约 ３８０℃／ｓ），温度梯度较大，接头在焊补温度场中经历一个复杂的不均匀快速加热和冷却过程，从而产生非协调应变，易发生裂纹等缺陷。
Using the finite element method, temperature field and heat cycle are analyzed. It is shown that the cooling rate is fast at the beginning of cool-down, the temperature distribution of welded joint is non -uniform. and the maximum temperature gradient gradient in the area near weld fusion line.
关键词
灰铸件
温度场
数值模拟
手弧焊接
grey cast iron
temperature field
numerical simulation
