Structural Sections

Stainless steels are used predominantly for their corrosion resistance in moderate to highly aggressive environments. For construction purposes, carbon steel normally is the common choice due to low cost, long experience, applicable design rules and a large variety of strength classes. However, different stainless steel types can also provide a very wide range of mechanical properties and they have the advantage of no need for surface protection. Some examples of industry end uses are structural supports for offshore oil & gas industry, chemical process industry, desalination and water treatment,...

Laser vs. laser-hybrid welding of Duplex Corrosion resistance Welding of Duplex stainless steels can be carried out with all commonly used processes, including arc and beam welding. However, several studies on welding of Duplex warn about rapid cooling as this leads to a freezing of the ferritic structure (up to 90% ferrite in the weld zone). This happens especially with methods characterized by high-energy density welding like laser beams. The resulting unbalanced ferrite content leads to a loss of corrosion resistance. On the other hand, an excessively slow cooling rate, that might result e.g....

Mechanical properties Laser-hybrid welded structural sections have a monolithic structure with a controlled area of heat input and a reduced seam compared to conventional welding technologies. Extensive destructive testing has shown that the fracture points in laser-hybrid welded sections are never located in the weld area itself. External stresses and loads applied to the sections are transmitted to the neighbouring parent material, which only fails when exceeding its own mechanical limits (Pic. 6). All Duplex grades feature significantly better mechanical properties than common austenitic stainless...

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