Abstract
The structure and properties of welded joints of reinforced steel micro-alloyed with vanadium were investigated. The reasons for the formation of cold cracks are given. It has been established that welding at negative ambient temperature in the near-weld zone of rebar class A500C forms quenching structures with a hardness of up to 470 HV. Preheating of the rods by gas welding leads to a decrease in the temporary tensile strength. The technology of mechanized welding in carbon monoxide is proposed. It has been established that in multilayer welding in a reducing atmosphere, the carbon equivalent value of the weld metal increases. The hardness of the heat-affected zone decreases to 200... 260 HV. Mechanical properties of welded joints made in carbon monoxide environment comply with the requirements of regulatory documents.
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