Abstract
The welded metals characteristics produced by TIG welding or laser beam welding depend on heat input as a function of laser power and welding speed. High laser power and high welding speed have produced welded joint with a remarkable decrease in fusion zone size and an acceptable weld profile with high weld depth/width ratio. At duplex stainless steels the microstructure of welded metal, and heat affected zone is strongly influenced by cooling rate, which is depend on heat input as a function of laser power and/or welding speed. It was found that increasing welding speed the corrosion rate of welded joints decreased. In austenitic stainless steels appeared pitting corrosion in the base material as well as in the welding zone. In case of 2304 duplex stainless steel pitting corrosion appeared in welded metal and heat affected zone in case of autogenously welding, but at 2404 duplex stainless steel pitting appear more in the heat affected zone.
Highlights
Due to its properties, stainless steels are becoming attractive materials for industrial applications such as steam generation, automotive, biomedical, chemical, transportation, nuclear and aerospace industries [1]
Duplex stainless steel has a microstructure in which the δ-ferrite and austenitic (γ) phases are evenly distributed over conventional duplex steels and 60/40 for poor duplex steels
The microstructure of tungsten inert gas welding (TIG) welded steels differ from the microstructure of laser beam welded materials by the shape and area of weld metals, but in case of duplex stainless steels the ferrite/austenite ratio modifies with welding speed
Summary
Stainless steels are becoming attractive materials for industrial applications such as steam generation, automotive, biomedical, chemical, transportation, nuclear and aerospace industries [1]. Stainless steels can be classified into different groups based on their microstructure. Duplex stainless steel has a microstructure in which the δ-ferrite and austenitic (γ) phases are evenly distributed over conventional duplex steels and 60/40 for poor duplex steels. The austenitic steel group includes the most common stainless-steel chromium-nickel steels. General purpose materials that have good resistance to atmospheric corrosion and many organic and inorganic chemicals. Suitable for processing, storing and transporting food and beverages. This makes them suitable for various applications due to their good formability and wide range of functional and aesthetic surfaces [2,3]
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