ІМПУЛЬСНІ СТАБІЛІЗАТОРИ ГОРІННЯ ДУГИ ПРИ ЗВАРЮВАННІ ЗМІННИМ СТРУМОМ ПРОМИСЛОВОЇ ЧАСТОТИ

Abstract

The work deals with the development of AC welding arc stabilization devices that provide a qualitatively different level of functionality to industrial frequency welding transformers. It is shown that despite the rapid spread and use of inverter sources of direct current for arc welding of metals, welding with alternating current, using simple and unpretentious welding transformers, which work at the frequency of the current of the industrial power supply network, continues to be relevant. With regard to manual arc welding with coated electrodes and a non-fusible electrode on alternating current of industrial frequency, the problem of increasing the stability of arc burning is solved thanks to the use of impulse stabilizers of arc burning. Thepurpose of the study is to increase the energy efficiency of industrial frequency alternating current welding power sources due to the development of arc stabilization devices at the modern level.The choice of the polarity of the pulses significantly affects the parameters of the stabilizing device and the AC welding process. Studies of the influence of the pulse polarity on the parameters of the pulse arc stabilizers themselves have been carried out. The schematic implementation of stabilization devices using stabilizing pulses, the polarity of which is opposite to the polarity of the arc current, is considered.The experience of using the developed stabilizers allows us to conclude that they provide sufficiently high stability of arc burning from an alternating current welding transformer during manual arc welding of low-alloy structural steels covered with electrodes, arc welding of stainless and other special steels, arc welding of cast iron, during non-fusible argon arc welding electrode of stainless steels, aluminum and its alloys with the contact method of initial ignition of the arc