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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Joining of duplex stainless steels using high-power laser beam-submerged arc hybrid welding
DESCRIPTION:Duplex stainless steels are utilized for many applications in oil, gas and hydrogen industry due to their excellent properties regarding strength, toughness and corrosion resistance. This outstanding performance is realized owing to a two-phase micro-structure of ferrite and austenite with a portion of at least of 30 % austenite. During welding, this microstructure ratio can be lost because of unfavorable heat input. Arc welding processes have become established in practice for welding duplex steels. These welding processes can produce joints with the required microstructure ratio, but the productivity is low. Beam welding processes exhibit high productivity, however cannot produce welded joints with the required microstructure ratio. Laser beam-submerged arc hybrid welding combines the advantages of both welding processes and can be a good alternative with high productivity.
In this study, laser beam-submerged arc hybrid welding processes are developed for butt joints of duplex stainless steel S31803 with different thicknesses of 16 mm, 20 mm and 30 mm using a disc laser beam source with a max. output power of PL = 16 kW. In this context, the parameters laser beam power, welding speed, wobble amplitude and the edge preparation are investigated to achieve a good weld appearance, 30 % austenite content and an impact energy of at least of 40 J at a test temperature of −40 °C. By means of visual inspections, metallographic analysis and Charpy impact tests, it can be proven that the weld seams meet these requirements. As results, efficient high-performance welding processes with welding speeds of up to vS = 1.0 m/min are achievable. Based on these results, laser beam-submerged arc hybrid welding has been shown to be a welding method with high productivity, which can play an important role in the future for the welding production of duplex steel parts.

CLASS:PUBLIC
DTSTART:20230614T121000
DTEND:20230614T123000
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