METALLURGICAL REASONS OF SCATTERING OF TOUGHNESS IN THE WELDED JOINTS OF THE CONSTRUCTION STEELS

摘要

The compositions of steels for the metallic construction have made the object regular improvements in both of metallurgical and manufacturing aspects, in particular at the request of the users who realize these products by welding process, efficiently to separate the responsibilities of the steel maker and welding designer for increasing the reliability of the welded structures. A considerable attention is rewarded to the properties of the fusion zone (weld bead) or the Heat Affected Zone (HAZ), just in the vicinity of the fusion line.