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Effect of welding on the fatigue strength of welded joints using the GMAW process in transformation induced plasticity steels (TRIP) used in the automotive industry

Published online by Cambridge University Press:  28 February 2012

Victor Lopez ,
Arturo Reyes ,
Patricia Zambrano  and
Joaquín Del Prado
Victor Lopez
Affiliation:
Corporación Mexicana de Investigación en Materiales, Ciencia y Tecnología 790 Saltillo, Coahuila, México.
Arturo Reyes
Affiliation:
Corporación Mexicana de Investigación en Materiales, Ciencia y Tecnología 790 Saltillo, Coahuila, México.
Patricia Zambrano
Affiliation:
Universidad Autónoma de Nuevo León, Ave. Universidad, San Nicolás, Nuevo León, México
Joaquín Del Prado
Affiliation:
METALSA, Carretera Miguel Aleman Km. 16.5, Apodaca N.L. México
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Abstract

Welding of TRIP steels are one of the technical challenges in the successful application of AHSS in chassis structures. Gas Metal Arc Welding (GMAW) is a common welding process used in the automotive industry, for joining mild steels. TRIP steel; however, do not offer the same ease of welding, and process control welding parameters is more critical. The welding parameters window represents the range of acceptable process parameters, primarily control of heat inputs, to obtain an acceptable weld. As a result, the effects of the heat input variations are greater and TRIP steel has a narrower welding parameters window in which acceptable welds can be made. Mechanical properties of the lap joints of TRIP 780 steel 2.8 mm thickness was analyzed, fusion welds were evaluated using fatigue tests on these joints for different heat inputs. Fatigue testing was conducted under a different number of nominal stress ranges to obtain the S/N curves of the weld joints.

Keywords

FatigueWeldingSteel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1381: Symposium S22 – Materials Welding and Joining Technologies , 2012 , imrc11-1381-S22-008
Copyright
Copyright © Materials Research Society 2012

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References

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