Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EFFECT OF TOE GRINDING ON FATIGUE PERFORMANCE OF CRUCIFORM WELDED JOINTS IN A NAVAL STEEL
Submission Author:
Kleber Eduardo Bianchi , RS , Brazil
Co-Authors:
Priscila Amaro, GABRIEL FUNES, Elias Hoffmann de Lima
Presenter: Elias Hoffmann de Lima
doi://10.26678/ABCM.COBEM2019.COB2019-0395
Abstract
Welded joints are especially susceptible to fatigue failures because welded affected region presents several internal and surface defects, high level of residual stress and a notch effect on the weld toe. Several studies have been implemented to develop procedures and techniques to increase fatigue life of welded joints, basically consisting on bead or fillet reworking after completion of welding process. Present work aims to evaluate the effect of the toe grinding technique, which consists on machining the weld toe with a round tip tool. The shallow circular groove generated by the process provides reduction on the notch effect, as well as the removal of crack like flaws. The study is focused on the influence of toe grinding in fatigue life of cruciform joints of ASTM A131-Grade AH36 steel, welded by Flux Cored Arc Welding process and subjected to transverse cyclic loading. Specimens were divided into two groups - with and without toe grinding application - and the fatigue tests were performed under similar conditions for both groups. The results obtained indicate that the failure mechanism, was the propagation of intrusion-type microcracks which were previously located at the weld toe. On the other hand, the specimens presenting toe grinding grooves presented an expressive increase in the number of cycles up to failure.
Keywords
fatigue, cruciform joint, ASTM A131 AH36 steel, toe grinding
