Zavarivanje i ispitivanje zavarenog spoja čelika HARDOX 400

Abstract

Čelici HARDOX imaju široku primenu za izradu opreme izložene habanju. Visoku otpornost na habanje ovi čelici postižu zahvaljujući velikoj tvrdoći i čvrstoći uz odličnu žilavost. Povećanje tvrdoće i čvrstoće čelika je obično praćeno pogoršanjem njihove zavarljivosti. Međutim, čelici HARDOX se odlikuju dobrom zavarljivošću, zahvaljujući relativno niskoj vrednosti njihovog ugljeničnog ekvivalenta. U radu su date preporuke za izradu tehnologije zavarivanja čelika HARDOX 400 i prikazani su rezultati ispitivanja spoja namenjenog za kvalifikaciju tehnologije zavarivanja. Spoj je zavaren dodatnim materijalom niže čvrstoće od čvrstoće osnovnog materijala, zbog čega tehnologija zavarivanja i procedura njene kvalifikacije imaju specifičnosti.

HARDOX steels are wudely used in manufacturing of equipment exposed to wear. High wear resistance of these steels is achieved by their increased hardness and strength, along with exceptional toughness. Increased hardness and strength of such steels is usually accompanied by decreased weldability. However, HARDOX steels have good weldability, thanks to a relatively low carbon equivalent value. In this paper, recommendations for developing a welding technology for steel HARDOX 400 are presented, along with the results of tests performed on a welded joint made for the purpose of welding procedure qualification. The joint was welded using additional materials with strength below that of the parent material, and due to this, the welding technology and the procedure of determining its qualification were specific.