STABILITY OF ARC PROCESS AND METAL TRANSFER AT MULTI-ELECTRODE ММА CLADDING

Abstract

The article is devoted to the study of the features of the electrode metal transfer process during surfacing with one electrode and a beam of electrodes for surfacing Т-590. Based on the analysis of current and voltage waveforms and comparison of the corresponding coefficients of variation, the possibility is demonstrated that when using an electrode beam, high stability of the arc process and surfacing performance at the level of mechanized methods can be achieved. The aim of the study is to compare mass transfer, stability of the arc welding process and its performance using a single coated electrode and a beam of electrodes. The technique is an experimental study of the process of electric arc surfacing using the original UPE-500 installation, which provides for automatic registration and digital processing of the received data while simultaneously stabilizing the parameters of the surfacing mode. It has been established that when surfacing with a beam of T 590 electrodes, droplet mass transfer occurs according to type G (without short circuits), in contrast to type D (with short circuits of the arc gap) when welding with a single electrode. The electric arc process is characterized by high stability, which is confirmed by the current change coefficients Kv i = 3,2 % and voltage Kv u = 15,7% . It has been shown that the productivity of cladding with a beam of three electrodes increases by 1.6 times compared to surfacing with a single electrode and approaches the productivity of mechanized surfacing methods.