Laser welding of a lean duplex stainless steel
2007 (English)In: 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007: Congress Proceedings, 2007, 335-344 p.Conference paper (Refereed)
Nd:YAG laser welding and laser gas tungsten arc (GTA) hybrid welding of the lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101) were performed with and without filler wire and nitrogen additions to the shielding gas. The high energy density associated with laser welding of duplex stainless steels can affect the mechanical strength and corrosion resistance negatively. The high solidification rates and cooling rates characteristic of laser welding may cause ferritization and chromium nitride precipitation. However, due to the balanced composition of LDX 2101, the austenite reformation in the weld metal and the heat affected zone (HAZ) was satisfactory as confirmed by tensile test results, corrosion performance in terms of critical pitting temperature (CPT) and hardness measurements. Transmission electron microscopy (TEM) was conducted on simulated HAZs to study the effect of cooling rate on precipitate formation. Furthermore, Laser-GTA hybrid welding of the galvanized carbon steel Dogal® DP 600 onto LDX 2101 in lap joints was successful without porosity or liquid metal embrittlement (LME), and with sufficient tensile strength.
Place, publisher, year, edition, pages
2007. 335-344 p.
Chromium nitride, Cooling rates, Corrosion performance, Critical pitting temperatures, Duplex stainless steel, Ferritization, Filler wire, Hardness measurement, High energy densities, Hybrid welding, Lap joint, Laser gas, Laser welding, Laser-GTA hybrid welding, Lean duplex stainless steel, Liquid metal embrittlement, Mechanical strength, Nd:YAG laser welding, Nitrogen additions, Shielding gas, Solidification rate, TEM, Tensile tests, Weld metal, Carbon steel, Chromium, Cooling, Corrosion resistance, Corrosion resistant alloys, Galvanized metal, Heat affected zone, Industrial applications, Laser beam welding, Liquid metals, Neodymium lasers, Nitrides, Scanning electron microscopy, Tensile strength, Tensile testing, Transmission electron microscopy, Tungsten
IdentifiersURN: urn:nbn:se:kth:diva-9297ISBN: 978-0-912035-88-8OAI: oai:DiVA.org:kth-9297DiVA: diva2:54601
26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007, Orlando, FL; 29 October 2007 through 1 November 2007
QC 201011262008-10-172008-10-172013-06-12Bibliographically approved