M. R Tavighi - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj Iran
A Asaadi Zahrai - Faculty of Materials Science and Engineering Khajeh Nasir Toosi University, Tehran.Iran
M Ghanbari Haghighi - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj Iran
B Karbakhsh Ravari - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj Iran

Joining of dissimilar metals is one of the most important requirements of different industries. The joining of alloy and plain carbon steels is typically involved in the manufacturing process, and this is because in this case, the cost required for the raw materials is reduced. On the other hand, in the joining of dissimilar metals and alloys, due to their different chemical composition, the strength and quality of the joining joint is largely dependent on the parameters involved in the process. Steel grades ۱.۷۲۲۵ (MO۴۰) and St-۳۷ are used in various industries. Due to the conditions, the bond strength of the above steel grades is very important. Therefore, the aim of this study was to investigate the effect of preheating time and temperature parameters on the mechanical properties of the bond formed between the alloy (MO۴۰) ۱.۷۲۲۵ and St-۳۷ steel. Studies have shown that among the various parameters, duration and preheating temperature are of great importance in increasing the service life of these parts in the welded state, but so far no detailed study on the duration and The proper preheating temperature for the welding process of steels (MO۴۰) ۱.۷۲۲۵ and St-۳۷ is not provided and usually the operating efficiency of these parts is low in severe stress conditions and these parts fail in the welded place.

Dissimilar Metals, HAZ, MO۴۰, St۳۷, Preheating