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Open AccessArticle

The Effect of Weld Reinforcement and Post-Welding Cooling Cycles on Fatigue Strength of Butt-Welded Joints under Cyclic Tensile Loading

1
Department of Mechanical Engineering, Universidad de Ibagué, Ibagué 730001, Colombia
2
Research Group in Multidisciplinary Optimal Design, Department of Mechanical and Mechatronics Engineering, Universidad Nacional de Colombia, Bogota 111321, Colombia
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 594; https://doi.org/10.3390/ma11040594
Received: 7 March 2018 / Revised: 4 April 2018 / Accepted: 7 April 2018 / Published: 12 April 2018
(This article belongs to the Special Issue Machining—Recent Advances, Applications and Challenges)
This research deals with the fatigue behavior of butt-welded joints, by considering the geometry and post-welding cooling cycles, as a result of cooling in quiet air and immersed in water. ASTM A-36 HR structural steel was used as the base metal for the shielded metal arc welding (SMAW) process with welding electrode E6013. The welding reinforcement was 1 mm and 3 mm, respectively; axial fatigue tests were carried out to determine the life and behavior in cracks propagation of the tested welded joints, mechanical characterization tests of properties in welded joints such as microhardness, Charpy impact test and metallographic analysis were carried out. The latter were used as input for the analysis by finite elements which influence the initiation and propagation of cracks and the evaluation of stress intensity factors (SIF). The latter led to obtaining the crack propagation rate and the geometric factor. The tested specimens were analyzed, by taking photographs of the cracks at its beginning in order to make a count of the marks at the origin of the crack. From the results obtained and the marks count, the fatigue crack growth rate and the influence of the cooling media on the life of the welded joint are validated, according to the experimental results. It can be concluded that the welded joints with a higher weld reinforcement have a shorter fatigue life. This is due to the stress concentration that occurs in the vicinity of the weld toe. View Full-Text
Keywords: butt weld joint; fatigue; crack growth rate; weld reinforcement; cooling rate butt weld joint; fatigue; crack growth rate; weld reinforcement; cooling rate
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MDPI and ACS Style

Araque, O.; Arzola, N.; Hernández, E. The Effect of Weld Reinforcement and Post-Welding Cooling Cycles on Fatigue Strength of Butt-Welded Joints under Cyclic Tensile Loading. Materials 2018, 11, 594.

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