| 摘要 |
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 ?and ?. Duration of ON state of thyristors ?, ?, ?, ?and current in secondary circuit I, I, I, lare measured in every case. In every period of welding current measured in duration of ON state of thyristors ? at known thyristor opening angle a. Duration of ON state of thyristors ?, ?for short-circuit mode and in that of loading with reference resistance at switching on the welding machine with thyristor opening angle. Secondary current Iand Iin welding mode for thyristor ON angles ?and ?. Thyristor opening angle ?is defined for preset welding current I.EFFECT: simplified automatic control hardware, higher precision of contact welding mode stabilisation.5 dwg, 1 ex |
