摘要
为了深入理解激光焊接方法的特点和工艺参数对温度场的影响规律,在焊接实验课中引入高能束焊接方法激光焊,并通过调整分层脉冲波形实现了对焊接温度场的控制。完成了殷瓦钢的脉冲激光焊接实验,采用红外热像仪测量了焊接温度场,采用有限元法计算了焊接温度梯度和焊后冷却速率。实验结果表明,预热脉冲能够有效降低焊接温度梯度和焊后冷却速率,随着预热脉宽的增大,焊接温度梯度和焊后冷却速率降低,而焊接热裂敏感性则先减小后增大。
The high energy beam welding method is introduced in welding experiment lessons for students to understand the characteristics of laser welding method and the effect of welding parameters on temperature field.The control of the welding temperature field can be realized by adjusting the waveform of pulse.During the pulsed laser welding experiment of Invar alloy,the welding temperature field is measured by infrared thermal imager,and the welding temperature gradient and cooling rate after welding are calculated with the finite element method.The experimental results show that preheating pulse can effectively reduce the weld temperature gradient and cooling rate after welding.The increase of preheating pulse duration leads to the decline of welding temperature gradient and cooling rate after welding,while the welding hot cracking susceptibility decreases at first and then increases.
出处
《实验技术与管理》
CAS
北大核心
2017年第4期175-177,共3页
Experimental Technology and Management
基金
大连理工大学教改基金(MS2014089)
中央高校基本科研业务费(DUT16QY45)
关键词
激光焊
温度梯度
冷却速率
热裂敏感性
laser welding
temperature gradient
cooling rate
hot cracking susceptibility
