检测熔池背面温度的电涡流传感器设计

从电涡流传感器的测量原理出发 ,研究了电涡流传感器检测熔池温度的基本原理。经过分析发现 ,在焊接状态下 ,熔池温度与传感器输出电压信号具有单值对应性。对传感器的电参数和结构参数进行了理论计算 ,设计了带有冷却系统的电涡流传感器 ,解决了传感器受热辐射影响的问题。采用步进式脉冲TIG焊焊接低碳钢时 ,该传感器能够准确检测到熔池背面温度变化的电压信号 ,为焊缝熔透控制提供了一种新的研究方法。该传感器的优点是采用非接触测量 ,不受热辐射、弧光的干扰 ,抗干扰性强 ,结构简单 ,成本低

Design of Electric Eddy Sensor for Detecting Temperature of Back Side of Weld Pool

According to the measure principle of electric eddy sensor,the basic principle of detecting weld pool temperature with the electric eddy sensor is studied.It is found by investigating on the welding that the relationship between the weld pool temperature and output voltage of the sensor is single valued.The electricity parameters and the structure parameters of the sensor are calculated theoretically,and an electric eddy sensor with a cooling system,which can solve the problem caused by the heat radiation,is designed.The sensor can detect true voltage signal about the changing temperature of the back side of weld pool when using the step traveling pulse TIG welding on mild steel.A new studying method for penetration control is proposed in this paper.The advantages of the sensor are that it doesn't adopt contact measure that can disturb the heat radiation and arc,it is strongly anti jamming,its structure is simple,and its cost is low.