Abstract
The installation and renovation works of steel structures are often performed using gas metal arc welding. Thereby, the welded elements of these structures are frequently protected by a variety of primers and coatings, especially in shipbuilding. Complex nonequilibrium physical and chemical processes occurring under the influence of high temperatures and electric arc discharge, as well as the presence of the products that affect the welding parameters, have a significant impact on the joints’ quality. Experimental studies on the coatings’ breakdown products influence on the gas metal arc welding parameters were performed with epoxy, alkyd, polyacrylate, polyvinyl butyral primers, epoxy zinc filled, vinyl chloride, vinyl isobutyl, and organosilicate coatings. The peculiarity of welding current waveform parameters was studied using oscillograms processing. It was found that the main coatings breakdown products that influence the current waveform are oxygen and carbon monoxide.
Highlights
For several centuries, steel has remained the most widespread and demanded structural material, and steel corrosion is a global problem for all industries [1,2,3]
Experimental studies of the welding current waveforms were performed with epoxy, alkyd, polyacrylate, polyvinyl butyral primers, epoxy zinc filled, vinyl chloride, vinyl isobutyl, and organic-silicate coatings
The following conclusions can be drawn from the present research: 1
Summary
Steel has remained the most widespread and demanded structural material, and steel corrosion is a global problem for all industries [1,2,3]. In a number of industries (shipbuilding and bridge building, nuclear and thermal power engineering, production of reinforced concrete products, etc.), the technology of protecting steel parts and structures is adjacent to the need for assembly, installation, repair, and restoration work performed by arc welding [4,5,6]. On the one hand, using weldable coatings significantly accelerates and simplifies the structural elements preparation for assembly and welding [7]. The coatings breakdown products reduce the electric arc stability and contribute to an increase in spatter and metal porosity, which can cause a weakening of the structure, especially in the presence of tensile stresses [7]. Volatile breakdown products can harm the welder’s health [8,9]
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