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Microstructural Characterization of Dissimilar Joint: SAE1008-2340 Welded by GMAW Process

Published online by Cambridge University Press:  24 February 2014

L. L. Rodríguez López ,
G.Y. Perez-Medina ,
L.A. Carrasco González ,
R.J. Praga Alejo  and
F.A. Reyes-Valdés
L. L. Rodríguez López*
Affiliation:
Corporación Mexicana de Investigación en Materiales, Saltillo, Coahuila, México.
G.Y. Perez-Medina
Affiliation:
Corporación Mexicana de Investigación en Materiales, Saltillo, Coahuila, México.
L.A. Carrasco González
Affiliation:
Corporación Mexicana de Investigación en Materiales, Saltillo, Coahuila, México.
R.J. Praga Alejo
Affiliation:
Corporación Mexicana de Investigación en Materiales, Saltillo, Coahuila, México.
F.A. Reyes-Valdés
Affiliation:
Corporación Mexicana de Investigación en Materiales, Saltillo, Coahuila, México.
*
*Email: leticia.rdz@comimsa.com
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Abstract

Gas metal arc welding (GMAW) of a sub-frame automotive industry was studied, applying a design of experiment (DOE) in Minitab and Matlab software. Voltages, welding speed and wire feed speed was defined as input variables; legs and throats of welding were output variables in millimeters dimension. The requirement for GMAW process was to achieve complete penetration, minimum values acceptable of legs and throat indicated in AWS D8.8M:2007 “Specification for automotive weld quality-arc welding” without any discontinuity, like undercutting or porosity. The required of quality were difficult to achieve due to the materials have microstructural and mechanical properties different, the SAE 1008 has 279MPa for ultimate tensile strength (UTS) and the microstructure consist of ferrite matrix with some small areas of cementite, while SAE 2340 has 456MPa of UTS with a combination of perlite and ferrite. It was possible obtain good quality welds with proper geometry and defect free with help to design of experiment. The conditions needed were a combination of parameters to not obtained significant change microestructural characterized by optical microscopy, stereoscopy and scanning electron microscopy.

Keywords

GMAWmicrostructurescanning of electron microscopy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1616: Symposium S5C – Structural and Chemical Characterization of Metals, Alloys, and Compounds - 2013 , 2014 , imrc2013-s5c-o016
Copyright
Copyright © Materials Research Society 2014 

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References

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