ANALYSIS OF METHODS FOR MAKING A ROOT BEAD TO ENSURE LEAK PROOFNESS OF CHEMICAL EQUIPMENT WELDED JOINTS

<jats:p>This paper is devoted to aspects of combined welding of thick-walled cases of chemical equipment. One of the most labor-intensive stages, complicated by the requirement of preheating, is making of the root bead by a welder inside the closed space. To eliminate this problem, promising technological approaches are reviewed. Their fundamental difference is the exclusion of the root welding operation from the reverse side of the joint, which makes it possible to significantly optimize and secure working conditions.</jats:p>