Abstract
X 2 CrNi 18 9 austenitic stainless steel material with web and flange thickness of 6 mm was welded by conventional GMAW and double channel shielding gas method (DMAG) to form double fillet T-joints. The differences between these two methods were characterized by measurements of mean welding parameters, thermal camera temperature measurements, Vickers hardness profiles and bead geometries of the joints. Results show higher mean current but lower mean voltage using double channel shielding gas method. Vickers hardness differences between the two methods were insignificant. Moreover, molten mean filler metal area was larger with double channel shielding gas method, which depicted that welding speed for the same filler metal deposition could be increased and this could yield increased productivity.
Kurzfassung
In der diesem Beitrag zugrunde liegenden Studie wurde ein hochlegierter austenitischer Stahl X 2 CrNi 18 9 mit einer Steg- und Flanschdicke von 6 mm mittels des konventionellen MAG-Schweißprozesses und einem Doppelkanal-MAG-Verfahren geschweißt, um Doppel-Kehlnähte herzustellen. Die Unterschiede der beiden Verfahren wurden mittels der wichtigsten Schweißparameter, Temperaturmessungen mittels Thermokamera, Vickers-Härteprofilen und der Schweißraupenabmessungen der Verbindungen charakterisiert. Die Ergebnisse zeigen bei dem Doppelkanal-Schutzgasverfahren eine höhere durchschnittliche Stromstärke, aber eine niedrigere Spannung. Die Differenzen in der Vickershärte waren für beide Verfahren nicht signifikant. Darüber hinaus war die Fläche des geschmolzenen Metalls beim Doppelkanal-Schutzgasschweißen größer, wodurch die Schweißgeschwindigkeit bei gleicher Zusatzwerkstoffeinbringung erhöht werden konnte und dies zu einer erhöhten Produktivität führte.
References
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