Study of residual stresses and fracture toughness in welded and repaired joints using A516 Gr70 steel
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2023
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BRAZIL MRS MEETING, 21st
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Resumo
The properties of welded joints subjected to cyclic loading is an important subject in several
áreas[1]. In this scenario, aiming to study this subject, welded joints made of ASTM A 516 GR
70 steel plates, with a thickness of 30.5 mm, welded by the MAG – Metal Active Gas
process (20% CO2) with the use of a K-bevel were analyzed. to allow full penetration due to
the high thickness [2]. The joints were manufactured with seven welding passes on each
side of the chamfer. After welding, one set was subjected to a repair pass, for remelting the
surface of the bead using the TIG (Tungsten Inert Gas) process, while another set was
subjected to two repair passes. This study aimed to analyze aspects of welded and repaired
joints: dimensions (height and width) of the bead, behavior of the residual stress profile
measured by X-ray diffraction, Vickers microhardness profile and fatigue crack nucleation
with based on ASTM E466 and E606 standards. The results indicated that the greater
number of repair passes decreased the compressive residual stress values in the transverse
and longitudinal directions, from -350 MPa to 50 MPa. There was greater uniformity in
hardness Vickers values (value between 200 and 210 HV) with the use of cord repairs. It
was observed that the fracture toughness presented values of 1500 J/mm (without repair)
and 900 J/mm (one pass and two repair passes), lower than that found in the material
without welding (3500 J/mm). Therefore, as the repair passes were performed, the residual
stresses in the weld bead tended to positive values, the hardness tended to stabilize with
values of 200 HV due to the increase in the number of repair passes and the fracture
toughness decreased in the welded material when compared to the values of the non-welded
material. There was no significant difference in fracture toughness between repair passes.
Como referenciar
BARROS, REGIS de M.C. de; NEVES, MAURICIO. Study of residual stresses and fracture toughness in welded and repaired joints using A516 Gr70 steel. In: BRAZIL MRS MEETING, 21st, October 1-5, 2023, Maceió, AL. Abstract... São Carlos, SP: Aptor Software, 2023. p. 1168-1168. Disponível em: http://repositorio.ipen.br/handle/123456789/34566. Acesso em: 27 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.