Effect of Welding Processes on Mechanical and Microstructural Characteristics of DP780 Steel Welded Joints for the Automotive Industry

Arc welding processes are widely used in the automotive industry among other welding processes. Consequently, laser welding technology is being used instead of arc welding due to the rapid heating and cooling characteristics of the laser. In this study, empirical investigations and comparative study...

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Bibliographic Details
Published in:Key engineering materials 2020-03, Vol.835, p.101-107, Article 101
Main Authors: Fathy, Naglaa, Ghanem, Mohamed Mosalam, Hafez, Khalid M., Abdel-Aleem, Hamed A.
Format: Article
Language:English
Subjects:
Arc heating
Automobile industry
Butt joints
Butt welding
Comparative studies
Dual phase steels
Duplex stainless steels
Fatigue life
Fatigue limit
Ferritic stainless steels
Gas metal arc welding
Hardness
Heat affected zone
Heat treating
Laser beam heating
Laser beam welding
Laser cooling
Lasers
Martensite
Metal fatigue
Microstructure
Softening
Weld metal
Welded joints
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Summary:Arc welding processes are widely used in the automotive industry among other welding processes. Consequently, laser welding technology is being used instead of arc welding due to the rapid heating and cooling characteristics of the laser. In this study, empirical investigations and comparative study are held out on the arc and laser beam welded joints of DP780 dual-phase steel. Accordingly, weld joint microstructures, hardness distribution, and fatigue properties cross the butt-welded joints were investigated. The results showed that laser beam welding produces narrow fusion and heat-affected zones while gas metal arc welding produced wide welds with incomplete penetration. It was observed that the microstructure of the laser joint weld metal has mainly lath martensite in the ferritic matrix, while microstructure of gas metal arc weld metal relies upon filler type. Heat-affected zone in DP780 steel exhibit hardness softening in both laser beam welding and gas metal arc welding due to martensite tempering, a wider softening region was clearly observed in heat-affected zone welded by gas metal arc welding than laser beam welding. Generally, fatigue ratio, fatigue limit and fatigue life of the welded joints were improved by using laser welding.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.835.101