Ensuring the weldability of rebar. Assessment of requirements of Interstate and Russian standards

Abstract

The analysis of requirements of various state Standards providing weldability of reinforcing steel is carried out. The factors that ensure the weldability of the reinforcement and the strength of welded butt joints are noted. The influence of production technology and chemical composition on the weldability of reinforcement is considered. The requirements of the new GOST 34028-2016, providing weldability of rebar, replacing all other standards for hot-rolled and thermomechanical hardened reinforcement, are considered. The main changes in approaches to providing and assessing the weldability of reinforcement and strength of welded joints in modern standards and standards of the past decades are shown. The practical justification and evaluation of the requirements of GOST 34028 to ensure weldability are given. Experimental data illustrating the influence of the chemical composition and the initial strength of the reinforcement on the strength of welded joints of the reinforcement are presented. The presence of contradictions in various points of the requirements of GOST 34028 to the strength of the welded joint, as well as the innovativeness of some requirements of this GOST to the chemical composition, are marked.