Abstract
Summary Superduplex (i.e. with PRE [pitting resistance equivalent] number over 40) SAF 2507 stainless steel (25Cr‐7Ni‐4Mo‐0.3N) rolled sheets, with a thickness of 3 mm, were used for this research. The sheets were laser welded (5 kW, 2.3 m/min) and corrosion tested in H2SO4 solutions with various chloride concentrations; stress corrosion tests (slow strain rate, 1 × 10‐6 sec‐1) were also conducted in the same solutions. The results obtained showed excellent chemical and mechanical behaviour in the welded joints. In the stress corrosion tests, only the solution with greater chloride concentration caused fracture in the weld bead, while under all other test conditions fracture occurred in the base metal, well away from the bead. These results were correlated with the information gathered from microstructural analysis, carried out by optical and electron microscopy. It has been verified that the laser welding process can also be effective with superduplex stainless steels, to achieve chemically and mechanica...
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