Application of resistance measurement method for determination of the parameters of thermal cycle of welding

摘要

The features of application of resistometric effect for investigation of the welding thermal cycle (TCW) are considered. Practical recommendations are given to eliminate the ambiguity of evaluation of the sample resistance which arises in Curie point transition. The structural-functional diagram of the sample temperature measuring device is described which is based on an alternating current double transformer bridge with quasimodulation balancing, capable of providing the measurement rate of ≥400 counts per second with ≤1,0% error. This device is the basis for a computerized facility for TCW investigation.