摘要
对航空材料GH4133高温合金激光深熔焊接过程进行了有限元数值模拟分析,建立了高斯旋转曲面体热源的热输入模型,得到了基于小孔模型的温度梯度曲线分布。结果表明,激光焊接小孔深度方向的热传导速率大于小孔径向的热传导速率;小孔前端的热梯度远大于小孔后端,小孔和熔池形状均为长椭圆形;距离焊缝不同位置处各点的升温过程相比焊缝中心具有延迟性,且温度峰值大大降低。
The laser deep penetration welding process of GH4133 high-temperature alloy was simulated by finite element method. The heat input model was founded of a body heat source according to Gauss revolution curve face body heat source.The temperature distribution gradient curve was obtained.The result shows that the heat conduct rate in depth direction is larger than that in the radial of the keyhole,that the heat gradient in front of keyhole is larger than that in the back of keyhole,and that both the keyhole and the molten bath are in shape of oblong oval.Also the temperature rise in different position from welded seam is postponed compared with that in weld seam centre, and the temperature, peak value of them is reduction greatly.
出处
《电焊机》
2007年第7期21-24,共4页
Electric Welding Machine
基金
国家自然科学基金项目(50475093)
关键词
热源模型
温度梯度
小孔
gauss revolution curved face body heat source
temperature gradient
keyhole
