Electron beam and plasma welding processes youtube. 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. Electron beam engineering provides precision laser beam welding and electron beam welding services nationwide. Lecture series on manufacturing processes ii by prof. Regarding fusion zone configuration, 4 mmin welding speed figure 3a resulted in a wide weld bead which is not acceptable in the case of laser welding. The absorbed energy is transferred by heat conduction into the volume of the.
Download laser beam welding seminar reports, ppt, pdf, laser beam welding seminar topics, abstracts, full documentation, source code. Laser seam welding is a joining technique used to weld multiple pieces of metal through the use of a laser. Until now, there is no reference in the open literature on using a single laser beam to successfully join galvanized steels in a gapfree lap con. Laser and electron beam welding 02 lectures assignments for week 2 mcq and fill blanks week 34. Shantanu bhattacharya,department of mechanical engineering,iit kanpur. Download laser beam welding seminar reports, abstract, pdf, ppt. 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.
The process of lbw consists of a focused beam of photons that are directed to the surface of the part to be welded. Electron beam and plasma welding processes laser beam welding and diffusion welding process high energy rate forming processes rapid prototyping technology rpt rapid manufacturing. Laser beam welding of aa5052, aa5083, and aa6061 aluminum alloys. 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. Advanced manufacturing process for micro system fabrication. Nptel provides elearning through online web and video courses various streams. We specialize in working with complex components for a variety of applications, including aerospace, automotive, medical, and sensors. Lecture notes welding and joining processes materials. The laser beams have enough energy and when it strikes the metal pieces produce heat that melts the material from the two metal pieces and fills the cavity. Certain arc and oxyfuel processes are also used for cutting metals. Joining technologies for metals recommended for you. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses.
Add to list found in welding courses, mechanical engineering courses. Laser beam welding and diffusion welding process tutorial of advanced manufacturing processes course by prof a. Sharma, department of mechanical engineering, iit roorkee. In order to avoid problems, initially, both parts of the joined piece should be subjected to low level energy impacts, followed by greater energy for filling. The beam provides a concentrated heat source, allowing for narrow, deep welds and high welding rates. In contrast wobble welding or oscillation welding is where a high beam quality laser is used with a galvo scanhead to rapidly oscillate the focal spot. In recent years, laser beam welding using two laser beams, or dual beam laser welding, has become an emerging welding technique. It requires a continuously fed consumable solid or tubular flux cored electrode. The laser beams are focused to the cavity between the two metal pieces to be joined. Advanced manufacturing processes free video lectures. Find materials for this course in the pages linked along the left. Joining of materials joining includes welding, brazing, soldering, adhesive bonding of materials. Increasing the welding speed to 6 mmin figure 3b resulted in a typical laser weld shape where remarkable decrease in the weld bead width was obtained. The laser concept dz z beam of photons crosssectional surface area s volume of this orange region is sdz.
Laser beam welding process in general cases heat is required to fuse the metals for any types of welding. Lec 15 laser beam welding joining technologies for metals. In this study, a detailed investigation was performed to quantify the. Laser welding is normally a liquidphase fusion welding process, i. Electron beam welding is a fusion welding process in which a beam of highvelocity electrons is applied to the material to be joined.
Soft lithography electron beam lithography xray lithography ion beam lithography dip pen lithography. A free powerpoint ppt presentation displayed as a flash slide show on id. Laser beam welding equipment, principle, working with. It is a gas laser built by ali javan at mit, with a wavelength of 632. The laser concept beam of photons beam has a crosssectional surface area of s material as the beam travels, it will cause stimulated emission and absorption within the material. Generally the travelling speed of laser welding is higher than those of arc and plasma welding. Laser beam welding utilizes high power density on the order of 1 mwcm 2 resulting in small heataffected zones and high heating and. Annual refresher programme in teaching arpit architecture and planning.
They cannot be separated easily by application of forces. There is a great difference between the amount of energy contained by beam electrons compared to the. Introduction to lasers technology education scarsdale middle school laser originally laser was an acronym for light amplification by the stimulated emission of radiation. Laser welding is a type of fusion welding which may be used to produce selective area spot welds or linear continuous seam welds. They produce permanent joint between the parts to be assembled. Laser beam welding and electron beam welding processes are the noncontact fusionstate welding processes that are discussed. This course provides the students a thorough understanding of the fundamentals of lasers. Welding process heat density wcm2 temperature 0c 1 gas welding 102 103 25003500 2 shielded meta arc welding 104 6000 gas metal arc welding 105 80000 3 plasma arc welding 106 1500030000 4 electron beam welding 107 108 20,00030000 5 laser beam welding 108 30,000. After one battery is welded, the next battery is moved into place and the operation is repeated, until the entire magazine has been welded. Paul,department of mechanical engineering, iit kharagpur. Laser beam is easy to focus, aim and guided by optical instrument, could be placed with a suitable distance to work piece, and could be guided again between surrounding machines and tools or barriers, while other welding methods cannt work due to the above space constraint. 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. 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.
The laser provides a concentrated heat source, which allows the metal to be rapidly brought to its liquid state temperature. Scribd is the worlds largest social reading and publishing site. Twi industrial members benefit from a 10% discount. Talat lecture 4300 beam welding processes of aluminium 14 pages, 14 figures basic level prepared by ulrich kruger, schwei. Conduction welding occurs at lower power densities or higher welding speeds. In laser beam welding process the heat is obtained from the application of a concentrated coherent light beam which is striking upon the weld metal and melts the metal, such this weld joint is obtained, this. Indian institute of technology guwahati and nptel via swayam 0 81.
May 01, 2016 pdf electron beam welding, despite a long history and widespread arc and laser technology, is still widely used in industry. Laser beam machining lbm is one amongst the foremost widely used thermal energy based noncontact kind advance machining method which may be applied for nearly whole vary of materials. Process specification and operator qualification for laser. Being such a concentrated heat source, in thin materials laser welding can be carried out at high welding speeds of metres per minute, and in thicker materials can produce narrow, deep welds between squareedged parts. Courses advances in welding and joining technologies. Arc and plasma welding cannot be employed in a vacuum. With more than 35 years of experience, we deliver outstanding laser welding quality with fast.
How laser beam welding works laser beam welding process. Previous studies demonstrated use of dual beam laser processing can delay humping onset to higher speeds and slow down cooling rates. A laser produces a beam of highintensity light which is focused into a single spot to provide a concentrated heat source which allows for narrow, deep welds and high welding. There are two types of laser welding processes, conduction and penetration. Prerequisite laser beam welding learning by doing lbd watch nptel drilling video lecture and answer following questions do not forget to click on cc in youtube window to see subtitles of the video submit this. This process uses thermal energy to remove material from metallic or nonmetallic surfaces. Salay stannard, materials engineer for joining technologies, an innovator in laser cladding and electron beam and laser welding applications, notes that cw lasers can achieve penetrations up to and exceeding 0. Applications and new trends in microwave material processing tutorial of advanced manufacturing processes course by prof a. Today, i will start the second module of advances in welding and joining. About swayam all courses national coordinators local chapters.
Now, we can see that the one is the typical electron beam welding machine. Welding is done with high power lasers with longer pulses so that metal can be heated to its melting point without vaporization. Laser beam welding an overview sciencedirect topics. So, this type of power source is typically useful in case of manual arc welding. This method of welding enables much easier control of weld parameters such as weld width and depth of penetration which can lead to a more efficient welding. Continuous wave gas lasers using carbon dioxide gas with power up to 20 kw are used for laser beam welding. Advanced manufacturing process for micro sytem fabrication by dr.
Thermit welding electron beam welding friction welding diffusion welding submerged arc welding submerged arc welding saw is a common arc welding process. Laser beam welding and electron beam welding processes are the noncontact fusionstate welding. The processes and applications of laser welding are most prominent in the automotive industry, where lasers boost productivity at a low cost when welding automotive parts such as roof, door or filter assemblies together. In laser welding, the absorption of energy by a material is affected by many factors such as the type of laser, the incident power density and the base metals surface condition. This course is intended for students who need to understand the basic principles of how lasers work and their main properties. Laser beam welding is a welding process that uses a laser beam to melt and vaporize material. 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 balance in keyhole mode power beam welding, fundamentals of heat generation by joule heating and process principles and overview on types of.
Based in southern california, the company provides. Nov 23, 2014 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. Laser beam welding is a fusion welding process in which two metal pieces are joined together by the use of laser. The high frequency of monochromatic light will fall on the surface then heating, melting and vaporizing of the material take place due. The workpiece melt as the kinetic energy of the electrons is transformed into heat upon impact. Ppt introduction to lasers powerpoint presentation free. Laser beam welding energy transfer is different than arc welding processes.
Other welding processes that produce fusion of the metals joined include electron beam welding and laser beam welding. Laser beam welding is a concentrated heat process whereby thick and thin materials can be fused together in several applications. Laser beam welding and diffusion welding process video. Combining laser beam welding and electron beam welding offers.
So we will move on to the next welding processes that we have. Gandhi assistant professor, department of mechanical engineering, indian institute of technology, bombay, mems. Laser welding is a process used to join together metals or thermoplastics using a laser beam to form a weld. Laser beam welding lbw is a welding technique used to join pieces of metal or thermoplastics through the use of a laser. Manufacturing technology 1 notes pdf mt 1 pdf notes book starts with the topics joining processes,classification of welding process,fusion welding,plastic welding,gas welding technique,oxyacetylene welding,friction welding,friction stir welding,brazing methods. They are mainly used to assemble many parts to make a system. About laser beam welding laser beam welding lbw is advance welding method which used heat generated by laser to join fabricated two component. How laser beam welding works laser beam welding process laser beam welding setup. Here the lasing material is in the form of a solid ruby. 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. Focusing head elements of a laser welding system 4.
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