Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes0-40923 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 21 article 1096 pages: 547-560

Hayder H. Khaleel*
Mechanical Engineering Department, University of Technology, Baghdad, Iraq; Engineering Technical College / Najaf, Al- Furat Al-Awsat Technical University, 31001 Al-Najaf, Iraq

Ibtihal A. Mahmood
Mechanical Engineering Department, University of Technology, Baghdad, Iraq

Fuad Khoshnaw
De Montfort University, Leicester, United Kingdom

High strength low alloy steel (HSLA DOCOL 500 LA) is utilized in the automotive structure because of its superior qualities such as good fatigue resistance, a high strength-to-weight ratio, assisting in reducing the weight of the vehicle, increasing fuel efficiency and lower CO2 emissions. Resistance Spot Welding (RSW) is the most welding technique that is used to join automobile parts together. This study investigated the RSW process for high-strength steel. By utilizing the Taguchi approach, the optimization process for double spot nuggets with the principal welding parameters of welding current, welding time, and electrode force was carried out. The values of optimum parameters were 8800Amp for welding current, welding time of 30 cycles and 2560 N for electrode force. Mechanical and microstructure tests were carried out to study the failure modes while the fatigue test was achieved to obtain the fatigue endurance limit and it was at a maximum load 1500 N and during the fatigue test two types of failure happened: full pull-out failure and cracks around the nugget zone.

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