Problems in repair-welding of duplex-treated tool steels

• Main Authors: T. Muhič, J. Tušek, M. Pleterski, D. Bombač
• Format: Article
• Language: English
• Published: Croatian Metallurgical Society 2009-01-01
• Series: Metalurgija
• Subjects: repair welding; nitrided tool steel; PVD coating; die casting
• Online Access: http://public.carnet.hr/metalurg/Metalurgija/2009_vol_48/No_1/MET_48_1_39_42_Muhic.pdf

The present paper addresses problems in laser welding of die-cast tools used for aluminum pressure die-castings and plastic moulds. To extend life cycle of tools various surface improvements are used. These surface improvements significantly reduce weldability of the material. This paper presents development of defects in repair welding of duplex-treated tool steel. The procedure is aimed at reduction of defects by the newly developed repair laser welding techniques. Effects of different repair welding process parameters and techniques are considered. A microstructural analysis is conducted to detect defect formation and reveal the best laser welding method for duplex-treated tools.