Abstract: Welding is a process of joining materials into one piece. Welding is used extensively for pipe welding, aerospace, aviation, biomedical implants, fabrication of race cars, choppers, etc. Welding processes include thermal fusion joining processes and solid-state joining processes. Arc welding process belongs to thermal fusion joining process. Generally, the metallurgy of the welded joint can be categorised into two major regions, the fusion zone (FZ) and the heat-affected zone (HAZ). The heat-affected zone (HAZ) is a region that is thermally affected by the welding treatment. The heat-affected zone (HAZ)is a transition zone, because it is composed with the microstructure of the BM and the HAZ. The changes of microstructures in the HAZ depend on the level of thermal exposure and are varying with distance from the weld metal zone. The main difficulty associated with welding is the prevention of unexpected deterioration of properties as a result of the microstructure evolutions which reduce the resistance to brittle fracture in the heat-affected zone (HAZ) [7]. Properties of the HAZ are different from those of the base material. According to the literature, the HAZ is the most problematic area in the high strength steels weld. For this reason, many research works investigated this critical zone in welded joint. The main research questions and results related to the HAZ will be presented.

Biography: Zakaria Boumerzoug is a professor of metallic materials at Biskra University. He joined Biskra University in 1992. He has completed his PhD from Constantine University in 1998. He published more than fifty articles and he participated to more than thirty international conferences as speaker and invited speaker (ICWET’16 Turkey, 3rd WCSE2017 Spain, ICMTMTE2018 Russia, HORA2019 Turkey,… .). He was as a member and also as a guest editor in some international conferences. He has supervised 20 PhD students. He has reviewed many articles of some scientific journals. He is a chief of an international project between Biskra University and UMONS University in Belgium. He has a short international teaching experience at Cadiz University, Spain. He organised more than 10 scientific meeting in Algeria. He is the academic editor of the journal Advances in Research from 01/09/2018 to 31/08/2022. He edited a book of Advanced Materials Design and Mechanics.