METHOD OF STABILISING CONTACT WELDING CURRENT Russian patent published in 2014 - IPC B23K11/24 

FIELD: process engineering.

SUBSTANCE: invention relates to contact welding current stabilisation and may be used in contact point and seam welding machines. Prior to starting the welding, welding machine is switched on in short-circuit mode and in that of loading with reference resistance at trigger-on angles of thyristors α₁ and α₂. Duration of ON state of thyristors λ _sc1, λ _sc2, λ_l1, λ_l2 and current in secondary circuit I_sc1, I_sc2, I_l1, l_l2 are measured in every case. In every period of welding current measured in duration of ON state of thyristors λ at known thyristor opening angle a. Duration of ON state of thyristors λ_sc, λ_l for short-circuit mode and in that of loading with reference resistance at switching on the welding machine with thyristor opening angle. Secondary current I_w1 and I_w2 in welding mode for thyristor ON angles α₁ and α₂. Thyristor opening angle α_w is defined for preset welding current I_def.

EFFECT: simplified automatic control hardware, higher precision of contact welding mode stabilisation.

5 dwg, 1 ex