基于Labview的激光焊接多点热循环曲线测量技术研究.PDF

第42 卷 第1 期 Vol．42 No．1 20 12 年1 月 Electric Welding Machine Jan．20 12 基于Labview 的激光焊接多点热循环 曲线测量技术研究 夏佩云，王春明，胡席远 (华中科技大学 材料科学与技术学院，湖北武汉 430074) 测量焊接过程的热循环循环曲线对于进行焊接冶金分析和应力分析意义重大。由于激光焊接近 摘要： 缝区温度变化极快，且热源快速移动，对测量的仪器和系统提出了很高的要求。基于Labview 软件和 USB 数据采集卡，选用高精度、快速响应热电偶，建立了激光焊接接触式测温系统。实现了冷端温度的 实时补偿和激光焊接过程中多点热循环曲线的测量，系统能满足激光焊接热过程快速响应的要求，获 得了准确的测量结果。 激光焊接；快速响应热电偶；热循环；Labview 关键词： TG456．7 A 1001－2303(2012)01－0059－05 中图分类号： 文献标识码： 文章编号： Detection of thermal cycles of laser welding based on Labview XIA Pei-yun，WANG Chun-ming，HU Xi-yuan ， ， ， (Department of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China) ： Abstract The detection of thermal cycles of laser welding takes an important part in analysis of welding metallurgy and residual stress．The temperature near the seam is rapidly changed ，even the thermal source is fast moving ，which brings difficulties in detection instrument and system．A system is set up in this paper used in detecting laser welding temperature field of laser welding ，assisted by Labview and data acquisition board based on USB bus ，in the grand of selecting thermocouples which are high-accuracy and quick response to the temperature．The system accomplished cold junction compensation and the detection of thermal cycles in laser welding． The experimental result obtained proved that the system satisfied the demand of quick response to temperature of laser welding． ： Key words laser welding ；quick response the