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Original Articles

Fatigue life assessment of weld joints manufactured by GMAW and CW-GMAW processes

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Pages 87-96 | Received 27 Mar 2016, Accepted 22 May 2016, Published online: 16 Jun 2016
 

Abstract

The fatigue strength of weld joints manufactured using gas metal arc welding and cold wire GMAW (CW-GMAW) was evaluated under stress-controlled cyclic loading. The material used in this study was class ASTM 131 grade A steel, joined using ER70S wire filler metal. The addition of cold wire led to a decrease in the amount of intergranular ferrite and an increase in hardness in the heat-affected zone. The assessment of fatigue life was performed by using the Weibull distribution and the results revealed that with a 99% reliability the joints produced using the CW-GMAW process have a longer fatigue life, especially as the stress amplitude increases.

Acknowledgments

The authors thank specially the team from Laboratory of Materials Characterization (LCAM) of the Federal University of Pará (UFPA) where all the experimental fatigue tests were performed.

Additional information

Funding

This work was supported by the FINEP/Brazilian Ministry of Science and Technology under Grant 01.07.0322.00 (FINEP/UFPA).

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