METHOD OF STABILISING CONTACT WELDING CURRENT Russian patent published in 2011 - IPC B23K11/24 

FIELD: process engineering.

SUBSTANCE: invention relates to contact welding current stabilisation and may be used in contact point welding machines. Prior to welding, power supply voltage U_ps, transformation factor at given stage K_m and inductive resistance X_2k in short-circuit conditions are defined. In welding, cosφ is measured in every period and decide on correction of thyristor opening angle α_j+1 in next period in interval U_v±ΔU, where U_v and ΔU are rated circuit voltage and its tolerable deviation by formula α_j+1=A₁·(U_c-U_H)+A₀, where A₀ and A₁ are factors depending upon cosφ defined as coefficient of linear binomial of the best uniform approximation in compliance with formulas and A₀=α^' where α' and α" are set for and as result of solution relative to α of equation where I₂ is preset welding current; k_i is welding current adjustment factor depending upon α and cosφ.

EFFECT: simplified ACS and higher accuracy of contact point welding current adjustment.

4 dwg, 1 ex