The Testing System Research On Welding Process Temperature Base On LabVIEW

In the course of welding, thermal resource moving along the welding seam, at every point of which temperature varies at any time, all of these phenomena is called welding heat cycle.It is also the circulation which thermal resource heats the basic metal.The transformation of metallurgical texture and the development of strss in the welding seam and its neighborhood lie on metallic chemical constitution and welding heat cycle.Especially,welding HAZ of near welding seam will meet with the (heating or cooling )process of welding heat cycle, it's the same to experience a specific heat processing .The every portion of welding seam and welding HAZ was heated different temperature,and was cooled different cooling temperature after welding cooling so the HAZ texture and performance was changed very complicated.Consequenctly, it's an important theory and effective meaning to test and analyse the temperature change of welding process.Parameters of welding heat cycle maily include heating velocity, heating maximal temperature, length of staying above phase transition temperature and cooling velocity. Any of these parameters will affect metallic performance after welding. Therefore,through based a set of advanced test and calculation of welding heat cycle are very important to analyze the change of welding joint texture and performance, reasons of welding defects.By improving welding procedure and process of welding heat circulation,we can improve the quality of welding products very well.Adopt the hardware and software of computer and connected with appropriate data processing. With studying and exploiting the testing system research on welding process temperature base on LabVIEW. The system employs computer technology which can collect and process data conveniently. It consists of electric thermo-couples, A/D interface board and a microcomputer.The system is the interger of data collecting, data processing and analyzing. With the system, we can the some paths acquisition of temperature signal,heat cycle graph real-time indication,data storage,data playback and graph printing and so on. The system has some avantages: high precision, esay usage, friendly interface and high ratio of quality to price than X-Y functional recorder.The article adopts the welding test of 16Mn alloy of low percentage steel. Throught testing welding heat cycle graph and analyzing the microcosmic tissue of welding HAZ, the testing result is very anastomosed than the traditional CCT. According to testing welding CCT graph and consulting welding CCT graph, we can forecast the texture of welding seam, and the authenticity and reliability of the system is even more approved.