It is intended to cover common applications of the process. Advanced manufacturing processes free video lectures. Dwivedi,department of mechanical engineering,iit roorkee. It is a gas laser built by ali javan at mit, with a wavelength of 632. Welding and joining processes materials science and. Limit states design concepts, loads on structures, bearing and friction type of bolts, welding, concentric and eccentric connections. Spontaneous and stimulated emissions, laser action, characteristics of laser beam concepts of coherence, hene and semiconductor lasers simple ideas, applications. Laser beam welding and diffusion welding process video. On this channel you can get education and knowledge for general issues and topics. Electron beam and plasma welding processes lecture 35 laser beam welding and diffusion welding processes lecture 36 high energy rate forming processes lecture 37 rapid. In this machining process metal is removed by melting and vaporization of metal particle from surface of work piece. Nptel provides elearning through online web and video courses various streams. Laser beam welding can be performed in air rather than in a vacuum such as with electron beam joining.
The high frequency of monochromatic light will fall on the surface then heating, melting and vaporizing of the material take place due. Ramesh singh laser welding basics laser welding is a noncontact process that requires access to the weld zone from one side of the parts being welded the weld is formed as the intense laser light rapidly heats the materialtypically calculated in milliseconds. Nptel video course mechanical engineering advanced finite elements analysis subject coordinator dr. Lbm is particularly suitable for making accurately placed holes. Comparison of plasma and laser beam welding of steel sheets treated by nitrooxidation 198 quality and good consistency 3, 9. This process can be split into two types, resistance spot welding and resistance seam welding. As contrasted to the additivejoining processes covered in the course manufacturing processes 1viz. This includes, physics of electric arcplasma, engineering the arcplasma for welding, metal transfer and mass flow in the weld pool, laser electron beam material interactions, pressure and force. Engineering, management and supervisory staff who need to understand the basic principles of laser material processes, with a focus on laser beam welding of metal and plastic. Previous studies demonstrated use of dual beam laser processing can delay humping onset to higher speeds and slow down cooling rates.
Laser beam welding and diffusion welding process tutorial of advanced manufacturing processes course by prof a. Micro usm and advances in usm tutorial of advanced manufacturing processes course by prof a. Gmaw welding, resistance welding and thermit welding. This book is written to serve the needs of under graduate students embarking introductory course in welding technology. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses.
Laser beam is used to measure distances of sun, moon, stars and satellites very accurately. Advanced manufacturing process for micro system fabrication. Certain arc and oxyfuel processes are also used for cutting metals. Nevertheless, the high initial cost of the laser equipment turned attention towards an appropriate arc method. This process uses thermal energy to remove material from metallic or nonmetallic surfaces. Laser beam machining lbm is a non conventional machining manufacturing process, a form of machining, in which a laser is directed towards the work piece for machining. Lecture 11 introduction to laser beam welding part i lecture 12 introduction to laser beam welding part ii lecture principles of gas metal arc welding part i lecture 14 principles of gas metal arc welding part ii lecture 15 welding metallurgy of advanced high strength steels part i. Laser beam machining used light energy from a laser to remove material by vaporization and ablation energy is concentrated optically laser emits either continuous or pulsed light beam 5 source. It can be used for measuring velocity of light, to study spectrum of matters, to study raman effect.
Nptel syllabus advanced manufacturing processes web course course outline the course covers the details of the advanced machining theory and practices, advanced machining processes, advanced metal forming processes, advanced welding processes and advanced foundry processes. Advances in welding and joining technologies usb media storage type. Today we will learn about laser beam machining principle, working, equipments, application, advantages and disadvantages with its diagram. Advanced manufacturing process for micro sytem fabrication by dr. In recent years, laser beam welding using two laser beams, or dual beam laser welding, has become an emerging welding technique. Twi industrial members benefit from a 10% discount. An introduction to laser beam welding twi training.
This course aims to elaborate the physical principles of arc, plasma, laser, resistance spot, electron beam and solid state welding processes. Mechanical engineering n p t e l national programme on. Shantanu bhattacharya,department of mechanical engineering,iit kanpur. Electron beam welding demonstration, july 2017 duration. Basics of fixturing and metrology are also covered in this course. Electron beam and plasma welding processes youtube. How laser beam welding works laser beam welding process. Now with fss fiber laser welding systems you have all of the benefits of the traditional yag laser welding.
About laser beam welding laser beam welding lbw is advance welding method which used heat generated by laser to join fabricated two component. This course talks about the manufacturing process and how the joining processes are related with the manufacturing. Sharma, department of mechanical engineering, iit roorkee. In this study, a detailed investigation was performed to quantify the. This course is presented in a lucid and simplified way to make it enjoyable to the beginners. The course takes us through the fundamentals of different machining processes, and optimization of a chain of processes through which a part undergoes. Sundaravalli, suchitra publications the book welding technology for engineering and technology studies. Laterally supported and unsupported beams, builtup beams. This book is designed to meet the requirement of revised syllabus prescribed by the anna university. Weldability, newer welding methods like plasma arc, laser beam, electron beam, ultrasonic, explosive and friction.
This book can be used as a research book for a final undergraduate engineering course or as a subject on lasers in manufacturing at the postgraduate level. This is a fast process which is commonly used in the automotive industry. Advances in welding and joining technologies nptel. Laser beam machining laser beam machining is a thermal materialremoval process that utilizes a high energy, coherent light beam to melt and vaporize particles on the surface of metallic and non metallic work pieces. Laser beam welding process in general cases heat is required to fuse the metals for any types of welding, in laser beam welding process the heat is obtained from the application of a concentrated coherent light beam which striking upon the weld metal and melt the metal, such this weld joint is obtained, this welding process is called laser welding.
Comparison of plasma and laser beam welding of steel. Topics covered in this course include fundamentals of metal joining technologies, fusion based processes, solidliquid joining processes, solid state joining processes, adhesive joining, metallurgical aspects of welding, and. As metengr noted, the associated specifications used for qualifying a laser welding procedure can vary between industries and applications. Metal inert gas mig and metal active gas mag welding are gas metal arc welding gmaw processes that use heat created from a dc electric arc between a consumable metal electrode and a workpiece which melt together to create a weld pool that fuses to form a join. Process solid state welding processes friction welding process electron beam and plasma welding processes laser beam welding and diffusion welding process high energy rate forming processes. Laser beam is a beam of light, coherent and strictly monochromatic intense power of the beam with a small crosssectional area enables welding to be performed over small area.
Soil exploration lecture notes, notes, pdf free download, engineering notes, university notes, best pdf notes, semester, sem, year, for all, study material. Engineering physics phy1 common for all branches unit. It can be is used for increasing speed and efficiency of computer. Laser beam machining is a thermal machining process which uses laser beam to produce heat. Currently it is finding wide use in communication engineering application where very fine wires are required to be welded and on micro circuit boards etc. No week module name 1 1 fundamentals of welding and joining 2 2 laser and electron beam welding 3 3 solid state welding processes 4 4 computational welding mechanics 5 5 microjoining and nanojoining 6 6 welding metallurgy. Nptel online certification courses since 20, through an online portal, 4, 8, or 12week online courses, typically on topics relevant to students in all years of higher education along with. Electron beam and plasma welding processes laser beam welding and diffusion welding process high energy rate forming processes rapid prototyping technology rpt rapid manufacturing, applications and advancements. Discusses a wide variety of processes and materials from the viewpoint of their fundamental physical and chemical properties. Also, this book can serve as a useful reference for academics, laser researchers, mechanical, manufacturing, materials or physics engineers, or professionals in any related modern. Laser beam welding can be used for welding of corrosion resistant steels and titanium alloys requiring high quality welds.
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