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EFFECTS OF HOLDING TIME ON HAZ-SOFTENING IN RESISTANCE SPOT WELDED DP980 STEELS

Published online by Cambridge University Press:  01 March 2013

C.J. Martínez-González ,
A. López-Ibarra ,
S. Haro-Rodriguez ,
V.H. Baltazar-Hernandez ,
S.S. Nayak  and
Y. Zhou
C.J. Martínez-González
Affiliation:
Unidad Académica de Ingeniería, Universidad Autónoma de Zacatecas, México Mechanical and Mechatronics Engineering, University of Waterloo, Canada
A. López-Ibarra
Affiliation:
Unidad Académica de Ingeniería, Universidad Autónoma de Zacatecas, México
S. Haro-Rodriguez
Affiliation:
Unidad Académica de Ingeniería, Universidad Autónoma de Zacatecas, México
V.H. Baltazar-Hernandez
Affiliation:
Unidad Académica de Ingeniería, Universidad Autónoma de Zacatecas, México
S.S. Nayak
Affiliation:
Mechanical and Mechatronics Engineering, University of Waterloo, Canada
Y. Zhou
Affiliation:
Mechanical and Mechatronics Engineering, University of Waterloo, Canada
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Abstract

Resistance spot welding (RSW) of dual-phase (DP) steel subjected to various conditions of cooling rate (holding time) is studied in this work. Lap-shear tensile testing is used in order to evaluate the mechanical performance of the weldments. The microstructure is analyzed through optical and electron microscopy and the hardness is obtained through Vickers method. Results indicate an effective tempered region along the sub-critical heat affected zone in all the samples. A broken morphology accompanied with presence of small carbides within tempered martensite phase is consistently observed. Variations in the cooling rate (holding time) indicate minimal effect on the degree of softening and on the mechanical performance of the welds.

Keywords

Weldingsteelstrength
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1485: Symposium 7D – Advanced Structural Materials—2012 , 2012 , pp. 95 - 100
Copyright
Copyright © Materials Research Society 2013 

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References

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