Influence of gas saturation on physical and mechanical properties of welded hidden seam with the flux made of the slag, obtained at manganese-silicon production

Abstract

Hidden building-up under a flux layer is a perspective way for restoration of equipment. For production of welding fluxes, wastes of metallurgical production are widely used as components. In this work new results of a study of influence of gas saturation on physical and mechanical properties of hidden welding seam are represented. The seam was made under laboratory conditions with a flux, obtained at production of manganese-silicon. Concentration of oxygen and nitrogen were measured according to GOST 17745‒90 “Steels and alloys. Methods of measuring gases” by a gas analyzer TC-600 of LECO, USA. The dependences of indices of physical and mechanical properties of welded seam metal on content of nitrogen, free oxygen and oxygen compounds were determined. The carried out study showed, that oxygen and nitrogen content in the welded seam decreases the whole spectrum of physical and mechanical properties of the welded seam. Based on the obtained dependences, by the degree of harmful influence, complex oxide inclusions of silicate of alumina and magnesium spinels are most dangerous from the point of view of physical and mechanical properties decrease.