Fundamentals of Metal Joining

Dheerendra Kumar Dwivedi, PhD, Professor in the Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee. He has completed his Bachelor of Engineering (mechanical engineering) from Government Engineering College Rewa in 1993, Master of Engineering (welding engineering) from University of Roorkee (now IIT Roorkee) in 1997 and Doctorate (metallurgical engineering) from MNIT Jaipur in 2003. He has been involved in teaching, research and development, industrial consultancy for the last 25 years broadly in the area of manufacturing technologies in general and casting, welding and surfacing modification for improved mechanical properties in particular. Recipient of Binani Gold Medal Award-2001 (IIM), and recognized in top 1% Global Scientists in Materials Domain by Elsevier-Stanford (2020). Five best research paper awards in National/International conferences.He has developed more than 200 hrs video lectures in area ofmanufacturing technologies under MOOCS/NPTEL program of MHRD Govt. of India. He supervised 16 PhD thesis and more than 50 M. Tech. dissertations. He has published in more than 148 research papers in peer reviewed SCI/SCIE indexed International Journal with h factor 34 and i-10 index 84 with total citation more than 3650 and RG Score 36.62.  He has published two books namely “Production and Properties of Cast Al-Si Alloys” with New Age International, New Delhi in 2013 and “Surface Engineering for Enhanced Tribological life of component” with Springer nature in 2018. He has executed more than 20 Research & Development project and 50 industrial consultancy project. Filed three Indian patents on technologies developed in area of A-GTAW and FSW. He has undertaken eight bilateral international collaborative research projects with reputed university namely Chemnitz University, Germany, Technical University Munich, Germany,Institute of Metal Research Shenyang, China, University of Belgorod, Russia, University of Coimbra, Portugal, University of Uberlandia, Brazil, University of Zacatecas, Mexico and Physical Technical Institute, Minsk, Belarus. Author has undertaken research projects in the area of friction stir welding, welding bonding, activated flux GTAW, oxy-fuel flame and high velocity oxy-fuel spraying for improved abrasive and erosive wear resistance, laser cladding of none-cobalt base alloys for improved cavitation resistance, laser assisted nitriding and ion implantation cast martensitic stainless steel for improved erosion resistance, friction stir processing of cast Al-Si alloys, Ni-Al-Bronzes. 

Metal Joining: Need, Approaches, Mechanisms.- Classification of Joining Processes.- Heat Generation and Protection of Weld.- Power Density & Peak Temperature of Welding Processes.- Physics of Welding Arc: Electron Emission and Welding Arc.- Physics of Welding Arc: Arc Initiation and Arc Maintenance.- Physics of Welding Arc: Arc forces, Electrode Polarity and Arc blow.- Physics of Welding Arc: Arc Efficiency, Metal Transfer and Melting Rate.- Arc Welding Power Source: Basic Characteristics.- Arc Welding Power Source: Basic Characteristics, Duty Cycle, and Feed Drives.