Friction stir welding (FSW) is a relatively new welding technology. Although FSW technology has been widely used in many industries, there is a lack of effective online detection method of process parameters. Weld temperature and tool positioning are two key parameters in the study of process parameters. To realize online measurement of weld temperature and tool positioning in FSW, a measurement method of weld temperature and tool positioning is proposed by designing a new online detection device in FSW. The weld temperature measurement is realized by the material emissivity model based on the principle of infrared temperature measurement. Based on the principle of trigonometric distance measurement, the tool positioning is measured by data processing algorithm. In order to verify the feasibility of the measurement method, the welding processes of aluminum alloy with two thicknesses are detected online. The results show that the weld temperature measurement accuracy of the online detection device is within ± 2%. The measurement of tool positioning is realized. This measurement method proposed in this paper can be applied to the optimization of process design and temperature feedback control.

搅拌摩擦焊（FSW）是一种相对较新的焊接技术。虽然FSW技术已经在很多行业得到广泛应用，但缺乏有效的工艺参数在线检测方法。焊缝温度和刀具定位是工艺参数研究中的两个关键参数。为实现FSW焊缝温度和刀具定位的在线测量，设计了一种新型FSW焊缝温度和刀具定位的在线检测装置，提出了一种焊缝温度和刀具定位的测量方法。焊缝测温是通过基于红外测温原理的材料发射率模型实现的。基于三角距离测量原理，通过数据处理算法对刀具定位进行测量。为了验证测量方法的可行性，两种厚度的铝合金焊接过程在线检测。结果表明，在线检测装置的焊缝温度测量精度在±2%以内。实现了刀具定位的测量。本文提出的这种测量方法可以应用于工艺设计的优化和温度反馈控制。