焊接温度场的实时检测及熔透闭环控制  

Real-time Measurement of Welding Temperature Field and Closed-loop Control of Penetration

作　　者：张华[1,2] 潘际銮[1,2] 廖宝剑 

机构地区：[1]南昌大学 [2]北京清华大学

出　　处：《焊接学报》1998年第3期176-183,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金;江西省自然科学基金

摘　　要：图像比色法是在普通的比色测温方法的基础上发展起来的新的温度场检测方法，它具有对检测距离、目标材料发射率依赖性小等特点。本文介绍使用图像比色法进行焊接温度场检测的系统构成和基本原理，实时地获得了焊接温度场全面信息，从中得到焊接方向及横截面方向上的温度分布，从而获得热循环参数信息，利用这些信息进行了等温线宽度闭环控制。试验结果证明：温度场实时检测速度快（０．５ｓ之内／场），等温线宽度闭环动态响应品质好，可在焊件厚度、焊接速度和对接焊间隙等变化时仍可获得满意的熔深控制。Colormetric method by using two different wavelength images is a new measuring method for temperature field on the basis of ordinary colorimetric method,which depend little on the measuring distance,emissivity of body etc. In this paper the real-time measuring system and measuring principle of welding temperature field by the method are described, the whole welding temperature field is real-time measured,so the temperature distribution at the welding direction and its section is obtianed, then parameters of thermal cycle. With data from the temperature close loop control system of the parameters of temperature field is developed and tested. Experimental results prove that it has high measuring speed(less than 0.5s/field)and good dynamic response quality. Weld penetration can be controlled satisfactorily under regurous welding condition such as welding thickness variation,welding speed variation and weldment gauge variation etc.

关 键 词：焊接温度场 图像比色法 焊接热循环 熔透控制 

分 类 号：TG402[金属学及工艺—焊接]