ML3601 Welding Technology Syllabus:
ML3601 Welding Technology Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The main learning objective of this course is to prepare the students for:
1. Acquiring knowledge on the various Metal Joining Processes.
2. Analysing the effect of heat transfer in welding.
3. Understanding the concepts involved in ferrous welding metallurgy.
4. Understanding the basics of non-ferrous welding metallurgy.
5. Knowing the causes and remedies of various welding defects ,weldability ,testing of weldments ,welding standards and codes.
UNIT I FUNDAMENTALS OF METAL JOINING
Welding – Principle of Gas Welding- Equipment-Technique- Principle of Arc –Arc Welding -Electrode types and classification- Gas Tungsten Arc Welding-Gas Metal Arc Welding- Submerged arc Welding-Atomic Hydrogen welding-plasma Arc Welding-Thermit Welding- Electro Slag WeldingLaser Beam Welding, Electron Beam Welding, magnetic pulse Welding- Principle – Resistance Welding – Spot Welding – Projection Welding – Upset Welding – Flash Welding – Forge Welding – Friction Welding, Friction stir welding – Diffusion Bonding – Explosion Welding, Soldering and Brazing-Adhesive Bonding.
UNIT II WELDING METALLURGY PRINCIPLES
Thermal cycles in welding: basic heat transfer equations, temperature distributions and cooling curves, dependence of cooling rate on heat input, joint geometry, preheat and other factors. Comparison of welding processes based on these considerations.
UNIT III PHYSICAL METALLURGY OF WELDING
Welding of ferrous materials: Iron- Iron carbide diagram, TTT and CCT diagrams, effects of steel composition, formation of different microstructural zones in welded plain-carbon steels. Welding of C-Mn and low-alloy steels, phase transformations in weld and heat – affected zones, cold cracking, role of hydrogen and carbon equivalent, formation of acicular ferrite and effect on weld metal toughness.
UNIT IV WELDING OF ALLOY STEELS AND NON-FERROUS METALS
Welding of stainless steels, types of stainless steels, overview of joining ferritic and martensitic types, welding of austenitic stainless steels, Sensitisation, hot cracking, sigma phase and chromium carbide formation, ways of overcoming these difficulties, welding of cast iron. Welding of non-ferrous materials: Joining of aluminium, copper, nickel and titanium alloys, problems encountered and solutions
UNIT V DEFECTS, WELDABILITY AND STANDARDS
Defects in welded joints: Defects such as arc strike, porosity, undercut, slag entrapment and hot cracking, causes and remedies in each case. Joining of dissimilar materials, weldability and testing of weldments. Introduction to International Standards and Codes
COURSE OUTCOMES:
Upon completion of the course, the students will be able to
1. Describe the various welding processes.
2. Examine the heat transfer associated with the welding process.
3. Describe the metallurgical changes in the ferrous weldments.
4. Appreciate the metallurgical changes in the alloy steels and non- ferrous weldments.
5. Identify the welding defects and provide the remedy according to the standards.
TEXT BOOKS
1. Baldev Raj,Shankar V,Bhaduri A K“.Welding Technology for Engineers” Narosa Publications 2009.
2. R.S.Parmar ‘Welding Engineering and Technology’ Khanna Publishers 2010
REFERENCES
1. Lancaster, J. F. “Metallurgy of Welding”, 4th Londre: George Allen & Unwin.1987.
2. Linnert, G. E., “Welding Metallurgy”. Vol. 1 and 2. 4th edition. A W S. USA, 1994.
3. Sindo Kuo, “Welding Metallurgy”, John Wiley & Sons, 2003