Research is connected with elaboration of the calculating module VarWELD, using MS Excel software, for item-by-item examination of various combinations of variable parameters of spot resistance welding as well as analysis of possible solutions for managing the characteristics of the process. Mentioned examination is one of the main stages of analogue modeling. Analogue modeling is new perspective approach for modeling of welding processes, based on process investigation, using logical functions. Application of analogue modeling in investigation of welding process allows predicting the quality level of goal function of the modeling without testing. In result the outlays for receiving the optimal welding regimes, metallographic research of welding seams, joint quality control and other facilities, considerable lowered. The procedure of analogue modeling using calculating module VarWELD is offered. The effectiveness of analogue modeling using VarWELD is proven.