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Duplex korrózióálló acél durvalemezek hegesztése

2015, Műszaki Tudományos Közlemények

Duplex stainless steels (DSS) are one of the modern stainless steels. Their name comes from their duplex microstructure, which contains about equal proportion of austenite and δ-ferrite. DSS are typically alloyed with chromium, nickel, manganese, molybdenum and nitrogen and contain low carbon. Their excellent corrosion resistance and mechanical properties make them proper base material for almost any task, that is why it is important to have a suitable welding technology for these materials. They are hard to weld because of their duplex microstructure and high alloy content, which, together, make sensitive these alloys to undesirable precipitations. The heat input, the shielding gas and the welding consumable must be chosen wisely. Thick (10 mm) plate just like in this experiment, are harder to handle. Careless handling of the welding parameters can cause problems in the ferrite-austenite phase balance and because of that the mechanical properties and corrosion resistance cannot fulfil the requirements. This experiments aims to compare a few possible welding procedure designs according for the previous details.