Course Details
Subject {L-T-P / C} : MM5122 : Joining of Metals { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Bankim Chandra Ray
Syllabus
Introduction: Principle, Theory and Classification of welding and other joining processes. Manual metal arc (MMA): Equipment requirement, electrodes for welding of structural steels, coating constituents and their functions, types of coatings, current and voltage selection for electrodes, Arc welding power sources Conventional welding transformers, rectifiers and current and voltage. The influence of these power sources on welding. Metal transfer. Submerged arc welding (SAW): Process details, consumables such as fluxes and wires for welding mild steel, Variations in submerged arc welding process. Gas metal arc welding (GMAW) or MIG/ MAG welding: Process details, shielding gases, electrode wires, their sizes, and welding current ranges. TIG welding: Process details, power sources requirements, electrode sizes and materials, current carrying capacities of different electrodes, shielding gases, application of process. Resistance welding: General principle of heat generation in resistance welding, application of resistance welding processes. Process details and working principle of spot, seam, and. projection welding, electrode materials, shapes of electrodes, electrode cooling, selection of welding currents, voltages. Welding metallurgy of carbon and alloy steels, Cast irons, Stainless steels, Al- and Cu-based alloys.Weldability and Heat affected zones (HAZ). Welding defects and detection techniques. Soldering and brazing: Difference between both the processes, consumables used, methods of brazing, fluxes used, their purposes and flux residue treatment.
Course Objectives
- To understand the principles of metal joinings.
- To get acquainted with different joinings available for metal joinings.
- To compare and contrast welding, brazing, and soldering of metals.
- To understand the principles of weldability, welding stresses, and welding defects.
Course Outcomes
1.The course integrates the principles and practices of different welding, brazing, and soldering processes to understand the metallurgy of joinings. <br />2. Joint preperation and its importance for a quality joining is discussed. <br />3. Different types of joinings like welding, brazing, soldering and revetting are presented to compare and contarst amongt these. <br />4. Types of different welding techniques are well demonstrated. <br />5. Imporatnce of advanced welding techniques are elucited. <br />6. Weld quality in terms of HAZ, welding stress and disatoprtion and defect are also delivered.
Essential Reading
- J F Lancaster, Metallurgy of Welding, Allen
- R L Little, Welding and Welding Technology, TNH
Supplementary Reading
- K Weman, Welding Processes Hadbook, Woodhead
- J Norrish, Advanced Welding Processes, Woodhead