Analysis of welding of the rear bridge semi-housing assembly of a firefighter truck by the semi-automatic procedure in gas protection

The problem considered in this paper is the welding technology of steel assembly a firefighter truck rear bridge semi-housing. Since procedure done two dissimilar steels, it necessary to analyze effects on mechanical properties and microstructure individual joint’s zones. weldability base metal was first (semi-housing tube flange), then method filler were selected and, finally, technological parameters calculated. computational experimental methods used for estimate, based hardness measurements critical zones analysis their structures. Experimental investigations performed aimed verification and/or eventual correction proposed technology.