On|line Temperature Detection Method in Core Area of Friction Stir Welding

Abstract

Abstract: A method for measuring the temperature in the core areas of FSW was proposed based on thermal image herein. The relation between radiance and voltage of the welding consumables on the shoulder edge, and the mapping relationship between gray value and voltage of the thermal image were established. The relationship between surface temperature of the welding consumables at the shoulder and the gray value of the thermal image was deduced. The relationship between the surface temperature of the welding consumables at the shoulder and the temperature in the core area was deduced combining with the radiation heat exchange principle, and the temperature in the core areas was obtained. Finally, the correctness and feasibility of the method for measuring the temperature in the core areas were verified by experiments.

Key words: friction stir welding(FSW), core zone temperature, radiant heat exchange, thermal image

摘要： 提出了基于热图像的搅拌摩擦焊核心区温度检测方法，通过建立轴肩边缘焊材表面辐射度与电压的映射关系、热图像灰度与电压的映射关系，推导出轴肩边缘焊材表面温度与热图像灰度的关系。结合辐射热交换原理，得到了轴肩边缘焊材表面温度与核心区温度的关系，并求解得到搅拌摩擦焊核心区温度。实验对比验证了所建测温模型的正确性与可行性。

关键词: 搅拌摩擦焊, 核心区温度, 辐射热交换, 热图像

CLC Number:

TP301

ZHANG Yucun1;CUI Yan1;FU Xianbin2;SUN Shixuan3. On|line Temperature Detection Method in Core Area of Friction Stir Welding[J]. China Mechanical Engineering.

张玉存1;崔妍1;付献斌2;孙世烜3. 搅拌摩擦焊核心区温度在线检测方法[J]. 中国机械工程.

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