Preliminary communication

Laser repair welding of molds with various pulse shapes

M. Pleterski ; Faculty of Mechanical Engineering, Ljubljana, Slovenia
J. Tušek ; Faculty of Mechanical Engineering, Ljubljana, Slovenia
L. Kosec ; Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
M. Muhič ; TKC d.o.o., Ljubljana, Slovenia
T. Muhič ; TKC d.o.o., Ljubljana, Slovenia

Abstract

Repair welding of cold-work tool steels with conventional methods is very difficult due to cracking during remelting or cladding and is generally performed with preheating. As an alternative, repair welding with laser technology has recently been used. This paper presents the influence of different pulse shapes on welding of such tools with the pulsed Nd:YAG laser. Repair welding tests were carried out on AISI D2 tool steel, quenched and tempered to hardness of 56 HRc, followed by microstructural analysis and investigation of defects with scanning electron microscopy. Test results suggest that it is possible to obtain sound welds without preheating, with the right selection of welding parameters and appropriate pulse shape.

Keywords

laser; repair welding; pulse-shaping; cold-work tool steel

Hrčak ID:

40249

URI

https://hrcak.srce.hr/40249

Publication date:

1.1.2010.

Article data in other languages: croatian

Visits: 3.234 *