Fatigue and Ultimate StrengthAssessment of Post Weld TreatedStrenx 1100 Plus Butt Welds

Abstract: The demand of stronger and lighter constructions are rapidly growing. Today's applications vary over a large range industries where the requirements are di_erent from product to product. Therefore, the focus of much research are the 3rd generation of so called Advance High-Strength Steels (AHSS). These are high-strength steels that are taylormade to get desired mechanical properties. One AHSS manufactured by SSAB is their Strenx 1100Plus steel that is specially design to get excellent welding properties. In this project it was investigated if the two post weld treatments TIG dressing and HFMI has a larger e_ect in the material then the recommendations for steel in general by the International institute of Welding (IIW). By comparing nominal fatigue stresses to standards it could be determined that the post treatment improves the fatigue life with 1 more fatigue class then the recommendations for each treatment. E_ective notch stress simulations was used to derive S-N curves for comparative reasons.