Analysis of the technological process of welding a membrane wall with Inconel 625 nickel alloy

The research carried out by the authors of this paper is focused on the technological process of Inconel 625 welding with the MAG–CMT (Metal Active Gas-Cold Metal Transfer) method. Inconel 625 was welded to the substrate material, which was 16Mo3 steel. Both materials are used to produce the so-called bimetallic tubes, which in practice serve as a part of the equipment intended for waste incineration. For this reason, the bimetallic tubes must withstand extreme conditions during their operation. Therefore, bimetal pipes are highly stressed composite components that must resist corrosion in a chemically aggressive environment. For this reason, an extensive material and technological analysis of the production of pipe bends with a supercritical bend of 0.7D from bimetal pipes with Inconel 625 cladding was performed. In the welding process, the authors investigated the possibilities of the CMT method with and without using the oscillating movement of the welding head. The most important factor in deciding which method would be appropriate was to measure the amount of iron on the surface of the coating layer. The authors’ paper builds on the authors’ previous research in this area, which was mainly focused on research on the critical bending of bimetallic tubes.