Estimate of weldability and selection of optimal welding technology for the cover of a tube girder made of the Cr-Mn high strength steel

Abstract

The basic procedure and welding technology for the cover of the tube girder is presented in this paper. The cover is made of the Cr-Mn high strength steel and it has to be welded over the whole perimeter in the V groove. Prior to prescribing the welding technology, the check of the base metal chemical composition and the mechanical properties was conducted. Then the estimate of weldability of the base metal was done what showed that that this steel was conditionally weldable with application of preheating. The welding technology was then prescribed, based on the previously determined parameters, and the welding procedure and filler metals were selected. The prescribed technology was executed on the selected samples and for its verification the hardness and the microstructure of the welded joint zones were determined. Analysis of experimental results has confirmed that the welding technology was appropriate and that it could be applied to real part.