Structural features of welded joints were FBW 10G2FB obtained in different thermal deformation conditions

The effect of thermal deformation parameters for butt fusion welding of steel tubes 10G2FB on the structure of welded joints was investigated. Found that the negative impact on the strength of connections made on the standard mode, has a presence in a coarse-grained structure of a bond and HAZ sections of polygonal ferrite and ferrite with the ordering of the second phase. Reduction of energy input in welding ensures the formation of a compound fine two-phase structure ? MAC ??phase? in the ferrite matrix. This structure enhances the plastic properties of compounds