Arcwelding introduction arc welding is the fusion of two pieces of metal by an electric arc between the pieces being joined the work pieces and an electrode that is guided along the joint between the pieces. Power density wmm2 oxyfuel welding arc welding resistance welding laser beam welding electron beam welding 10 50 9000 10,000 power density in. Classification of welding processes and definition of welding arc physics of. Welding is a dependable, efficient and economic method for permanently joining similar metals. Dwivedi, department of mechanical and industrial engineering,iit roorkee. Lecture notes on veer surendra sai university of technology. Nonconsumable electrodes are only used as a conductor for the electrical current, such as in gas tungsten arc welding. Tig, plasma arc, mig 36 pages, 47 figures basic level prepared by ulrich kruger, schwei.
Lecture 9 arc welding power source i this chapter presents the need of welding power source and their classification besides the basic characteristics of welding power sources. Arc physics and weld pool behaviour candu owners group. Nptel video lecture topic list created by linuxpert. We manufacture a full line of products for welding schools, light to heavy duty metal fabricators, maintenance shops, home use and more. Basic arc welding syllabus course information course name. If you have watched this lecture and know what it is about, particularly what mechanical engineering topics are discussed, please help us by commenting on this video with your suggested description and title. The filler metal for gas tungsten arc welding is a hand fed consumable welding rod. Lecture 4 welding processes 2 arc welding 19 august 2014, tuesday11. The electrode generally serves as the filler material. Different types of weliding process and details part 1. Filler material is typically added to strengthen the joint. The process uses shielding from an externally supplied gas to protect the molten weld pool.
The time for which welding current is applied in single impulse welding to the work hold time. Which of the following welding process has lowest heat source. Power source characteristic arc welding part 1 lecture 9 production engineering duration. The introduction to welding publication is a fullcolor text that briefly introduces a beginner to the common electric arc welding processes. Find the best welding speed to be used for welding 6 mm steel plates with an ambient temperature of 30 c with the welding transformer set at 25 v and current passing is 300 a. Some arc welding operations also apply pressure during the process and most utilize a. Lecture notes welding and joining processes materials. Flux core arc welding fcaw is the same machine as the mig welder but the difference is it either uses just the wire with a flux in the center of it or a combination of the flux in the center of the wire and a shielded gas from a bottle. The process uses shielding from an externally supplied. Each of the above type of welding can be further classified depending on other micro level characteristics.
The process is used with shielding from the decomposition of the electrode covering, without the application of pressure, and with filler metal from the electrode. By ryan saucier history of arc welding arc welding dates back to the late 1800s first developed following the invention of ac electricity pioneered when a man was welding with a bare metal rod on iron, the sparks from the welding caught a stack of newspapers on fire near him and while welding, he noticed that his welds started looking a lot better. Lecture series on manufacturing processes i by prof. Find materials for this course in the pages linked along the left. This video lecture, part of the series manufacturing processes i by prof.
Manufacturing process technology part i 117,081 views. The limiting cooling rate for satisfactory performance is 6 cs at a temperature of 550 c. Flux core arc welding fcaw flux core arc welding overhead. Electrode size is nominated by diameter of core wire and is. Smart material, adaptive structures and intelligent mechanical systems iitk. Some arc welding operations also apply pressure during the process and most utilize a filler metal. Selection of suitable type of power source for different welding processes has also been described. Nptel syllabus marine construction and welding video course.
The arc may be divided into five partsthe cathode spot the cathode drop zonethe arccolumnthe anode drop zonethe. Arc welding refers to a group of welding processes in which heating of the metals is accomplished by an electric arc, as shown in figure 1. Arc welding it is a fusion welding process in which the melting and joining of metals is done by the heat energy generated by the arc between the work and electrode. Fundamental of welding science and technology intro video. Intro to welding a weld is made when separate pieces of material to be joined combine and form one piece when heated to a temperature high enough to cause softening or melting. Moreover, these processes sometime use a dc power source which can supply varying current called base current and peak current.
Welding arcs as heat sources the welding arc is a high current, lowvoltage discharge in the arc. Welding and joining processes materials science and. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Discusses a wide variety of processes and materials from the viewpoint of their fundamental physical and chemical properties. Routing drilling riveting arc welding grinding flame cutting deburring spray painting. Oct 06, 2014 lecture 4 welding processes 2 arc welding 19 august 2014, tuesday11. Nptel provides elearning through online web and video courses various streams. Jan 23, 2019 25 videos play all fundamental of welding science and technology nptel iit guwahati mix play all mix nptel iit guwahati youtube introduction to manufacturing process tecnology duration. Lecture 9 arc welding power source i inflibnet centre. An electric arc is generated when the electrode contacts the work and then quickly separated to maintain the gap. The quality of the weld depends on the handling and care of the flux. In gas metal arc welding mig which of the following polarity is generally used. Gas metal arc welding process fundamentals in gmawthe welding heat souris an arc maintained between a consumable wire electrode and the workpiece the weld is formed by melting and solidification ofthe joint edges togetherwith filler material transferred from the electrode an flowofinert gas shields the hightemperaturearcand.
Mar 29, 20 in some welding process a filler material is added to facilitate coalescence. The electrode is either a rod that simply carries current between the tip and the work, or a rod or wire that melts and. Nptel video lectures, iit video lectures online, nptel youtube lectures. Welding is most commonly associated with metallic parts but for plastics also it is used. Lecture 28 shielded metal arc welding lecture 29 gas metal arc welding i lecture 30 gas metal arc welding ii lecture 31 gas tungsten arc welding digimat the no. Arc welding grinding flame cutting deburring spray painting coating sand blasting dip coating gluing polishing heat treatment c. Further, the concept of self regulating arc has been elaborated. Lecture 29 gas metal arc welding i nptel video lecture topic list created by linuxpert systems, chennai get digimat digital media access terminal for highspeed video streaming of nptel and educational video courses in lan lecture 30 gas metal arc welding ii lecture 31 gas tungsten arc welding lecture 32. Courses fundamental of welding science and technology. Dwivedi, does not currently have a detailed description and video lecture title. Lincoln electric is the world leading manufacturer of arc welding equipment, consumables and accessories for stick, tig, mig, ux cored and submerged arc welding, as well as oxyfuel and plasma cutting. Power density wmm2 oxyfuel welding arc welding resistance welding laser beam welding electron beam welding 10 50 9000 10,000 power density in various welding operations 5. In some welding process a filler material is added to facilitate coalescence. Eyres aluminum welding 2nd edition narosa publishing.
Gas metal arc welding gmaw, by definition, is an arc welding process which produces the coalescence of metals by heating them with an arc between a continuously fed filler metal electrode and the work. Chapter 3 introduction to welding in the navy as well as private industry, welding is widely used by metalworkers in the fabrication, maintenance, and repair of parts and structures. In the next lecture we will study the applications of mechatronics in manufacturing engineering and in the subsequent lectures. Industrial engineering online course video lectures by iit. Smaw stick welding cven 485 spring 2005 smaw shielded metal arc welding aws definition an arc welding process with an arc between a covered electrode and the weld pool. Introduction to welding from the industrial revolution to. Which one of the welding is a solid state welding process.