Course11210721360 lectures
Joining Technologies for Metals
Prof. Dheerendra Kumar Dwivedi · IIT Roorkee
About
It is proposed to include following joining technologies of commercial importance under different groups of processes.
A) Fundamentals of Metal Joining Technologies: mechanisms for obtaining metallic continuity: fusion, deformation, diffusion, chemical interactions B) Fusion based processes: principle of fusion welding processes, oxy-fuel has welding, common arc welding processes, high energy beam welding processes, resistance welding processes, newer variants of fusion welding processes C) Solid-liquid joining processes: brazing and soldering, braze welding, cold metal transfer welding, D) Solid state joining processes: friction welding and its variants, diffusion bonding, ultrasonic welding and explosive welding and E) Adhesive joining: design, procedure, and applications F) Metallurgical Aspects of Welding: weld thermal cycle, solidification of weld metal G) Weldability of carbon steel, alloys steel, stainless steels; Fe-C, TTT, CCT and schaffler diagram for understanding the metallurgical transformation in weld and heat affected zone., basics of residual stresses H) Common issues related with joining technologies their causes and remedies: hardening and softening of heat affected zone, porosity, cracking,
Intended audience: It is a core course for UG/PG students, practicing engineers.
Lectures
Week 1
- Introduction: Manufacturing and Joining
- Fundamental mechanisms of Joining
- Classification of Joining Processes
- Heat Generation in Welding
- Protection of Weld Metal
Week 2
- Principle of Fusion Welding Processes: Gas Welding
- Fundamentals of Welding
- Physics of Welding Arc
- Shielded Metal Arc Welding
- Gas Tungsten Arc Welding
Week 3
- Newer variants of Gas tungsten arc welding
- Gas metal arc welding
- Submerged arc welding
- Electro-slag and Electro-gas welding
- Laser beam welding
Week 4
- Brazing
- Soldering and braze welding
- Fundamentals of resistance welding
- Resistance welding processes: spot and seam welding
- Flash butt welding
Week 5
- Adhesive joining
- Weld bonding
- Solid state joining technologies: Fundamentals
- Ultrasonic welding
- Diffusion welding
Week 6
- Explosive welding
- Magnetic pulse welding
- Weld thermal cycle
- Heat affected zone and weld thermal cycle: I
- Heat affected zone and weld thermal cycle: II
Week 7
- Solidification of weld metal
- Metallurgical transformations in weld and heat affected zone of steels
- Residual Stresses in Weld Joints
- Solidification cracking and their control
- Cracking of Welded Joints II: Cold Cracks
Week 8
- Understanding Weldability: Introduction - I
- Understanding Weldability: Introduction - II
- Metal Properties and Weldability - I
- Metal Properties and Weldability - II
- Weldability of Work Hardenable Metals
Week 9
- Weldability of Work Hardenable and Precipitation Strengthened Metals
- Weldability of Precipitation Strengthened Metals
- Weldability of Metals Strengthened by Grain Refinement, dispersion Hardening and Transformation Hardening
- Weldability of Transformation Hardening Metals
- Weldability of Metals: Combination of Strengthening Mechanisms
Week 10
- Weldability Consideration
- Weldability of Carbon and Alloy Steel - I
- Weldability of Carbon and Alloy Steel - II
- Weldability of Carbon and Alloy Steel - III
- Weldability of Low Carbon Steel and Mild Steel
Week 11
- Weldability of Medium Carbon Steel and High Carbon Steel
- Weldability of High Strength Low Alloy Steels
- Weldability of HTLA Steel - I
- Weldability of HTLA Steel - II
- Weldability of Cr-Mo Steel - I
Week 12
Syllabus and materials
At NPTEL, as the course publishes them.
Credits and licence
- Institution
- IIT Roorkee
- Department
- Mechanical Engineering
- Teacher
- Prof. Dheerendra Kumar Dwivedi
- Level
- Undergraduate
- Language
- English
- Subjects
- Engineering
- Source
- NPTEL
- Licence
- CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
- Attribution
- NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
- Who can watch
- NPTEL gives no rating. Invisible Network shows it to Tweens profiles and older, judged from what the source says about it. How courses are placed