The basic principle of mig welding is, an arc is maintained between the end of the bare wire electrode and the work piece where the heat source required to melt the parent metal is obtained. The main components of the equipment required for welding are. This could mean changing consumables away from heavier wire, hilbert says. An electric current, either alternating current or direct current, forms electric arc between the electrode and the metals to be joined. Once started, the process continues until the electrode is spent, allowing the. An arc cutting process in which metal is cut by melting it with the heat of an arc between a covered electrode and base metal. Describe the principles of the process and the equipment used explain the functions of the electrode wire, coating and slag identify electrodes and the materials used in the coating. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. In this arc welding process, the electric current passes through a consumable electrode, usually in the form of a thin stick. Students will strike and maintain an arc to run short beads as identified in the shielded metal arc welding activity sheet. Welding is a process of metal joining by applying heat and sometimes pressure classification of welding processes welding forge or pressure welding under pressure without additional filler metal fusion or non pressure welding with additional filler metal. The shield metal arc welding process commonly is used in general construction, shipbuilding, pipelines and other maintenance work. Mar 27, 2012 the fundamentals of shielded arc welding in a horizontal position. The melting action is controlled by changing the 1 amount of electric current that flows across the arc and 2 the size of the electrode.
Shielded metal arc welding smaw, or manual metal arc welding was first invented in russia in 1888. Arc welding is a fusion welding process in which the heat required to fuse the metal is obtain from the electric arc between the base metal and an electrode. Download gmaw seminar report and ppt for mechanical engineering. Identify the safety practices that should be observed when working with shielded metal arc welding. Welding procedure data sheets shall require a new welding procedure specification and or welding procedure data sheet. Shielded metal arc welding shielded metal arc welding shielded metal arc welding smaw welding. Welding procedure specification shielded metal arc weldingsmaw.
Shielded metal arc welding smaw, also known as manual metal arc welding mma or mmaw, flux shielded arc welding or informally as stick welding, is a manual arc welding process that uses a consumable electrode covered with a flux to lay the weld. Shielded metalarc welding smaw is the simplest and used for many joining processes. Shielded metal arc welding smaw yeongdo park, phd associate professor, director of center for education of welding engineering department of advanced materials engineering dongeui university content introduction types of welding shielded metal arc welding smaw. Arc welding is a process that uses electricity to heat and melt the metal. The high temperature of this arc melts the metal to be welded, forming a molten puddle. Shielded metal arc welding an overview sciencedirect. Principles the american welding society defines smaw as shielded metal arc welding smaw. Consumable electrode wire, having chemical composition simiilar to that of the parent material, is continuously fed from a. Electric arc welding 37 electric arc welding equipment 38 use of electric arc welding 39 metal arc inert gas shielded 40 mig equipment 41 use of mig equipment 42 butt weld 43 slag inclusion 44 xray testing. The fundamentals of shielded arc welding in a horizontal position. The development of coated electrodes did not occur until the early 1900s when the kjellberg process was invented in sweden and the quasi arc method was introduced. Welding is the melting, flowing together, and freezing of metals under controlled conditions. Applying shielded metal arc welding smaw techniques.
Shielded metal arc welding smaw 1g3g6g this course is designed to offer necessary theoretical and practical exposure to shielded metal arc welding process. A free powerpoint ppt presentation displayed as a flash slide show on id. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. True false electrode holders and ground clamps are rated according to the amount of current they may carry. Special studies on mutagenicity of welding fumes 55 appendix a. More than 50% of industrial and maintenance welding currently is performed by this welding process. This process has become very popular in the last 40. Gas tungsten arc welding basic, 2inch pipe, or 6inch pipe. Describe how to select shielded metal arc welding equipment and supplies.
The heat source is an arc maintained between a consumable electrode and the workpiece. Shielded metal arc welding smaw is the simplest, least expensive, and mostly widely used arc welding process figure 2. The high temperature arc and hot metal can cause severe burns. Oct 31, 2018 shielded metal arc welding smaw is a fusion welding process that uses a consumable, fluxcoated electrode to create an arc between the electrode and the work piece. Effects of welding on health i american welding society.
Aug 18, 2016 this welding process goes by a variety of names, including flux shielded arc welding and manual metal arc welding. Take a close look at your process and what youre using. Nov 18, 20 arc welding because of the versatility of the process and the simplicity of its equipment and operation, shielded metal arc welding is one of the worlds most popular welding processes. The teacher will evaluate each students performance using the. Basic shielded metal arc welding power sources power output is constant current cc type it has a drooping volt. True false a motor generator power source is designed to change dc current to ac current. Proper selection and set up of equipment is necessary in order to achieve a reliable weld while maintaining a safe work environment. It involved a bare metal rod with no flux coating to give a protective gas shield. Once started, the process continues until the electrode is spent, allowing the operator to manage multiple gravity welding systems. Air products welders handbook migmag welding principles gas shielded metal arc welding is a semiautomatic process which is suitable for both manual and mechanised operation. Mig metal inert gas mag metal active gas co2 carbon dioxide a low voltage 18. The arc melts the end of the electrode wire, which is transferred to the molten weld pool. Gas metal arc welding basic, advanced, or pipe digital video. Shielded metal arc welding is often referred to as stick welding and remains one of the most widely used forms of welding in the industry because of its simplicity and low cost.
Heat the arc produced during welding can exceed 3000 degrees celsius. Shielded metal arc welding basic, advanced, or pipe digital video. The melting action is controlled by changing the 1 amount of electric current that flows across the arc and 2. This arc welding safety brochure may be freely copied for educational purposes if distributed to welders and welding students at no additional charge.
Weldingchp 6 shielded metal arc welding flashcards quizlet. After completing this learning unit you should be able to. The other two processes to be discussed, resistance spot figure 1. Basics of arc welding the arc is struck between the electrode and the metal. Shielded metal arc welding smaw, also known as manual metal arc welding mma or mmaw, flux shielded arc welding or informally as stick welding, is a manual arc welding process that uses a consumable electrode covered with a flux to lay the weld an electric current, in the form of either alternating current or direct current from a welding power supply, is used to form an electric arc. In addition the electric arc itself provides an additional safety hazard. Certification will be in accordance with the requirement of aws d1. Of the six common arc welding methods, gas metalarc welding gmaw, shieldedmetal arc welding smaw, and fluxedcored arc welding are all examples of nonconsumable electrode processes, while gastungsten arc welding gtaw is an example of a consumable electrode process.
Arc welding aw a fusion welding process in which coalescence of the metals is achieved by the heat from an electric arc between an electrode and the work electric energy from the arc produces temperatures 10,000 f 5500 c, hot enough to melt any metal most aw processes add filler metal to increase volume and strength of weld joint rattandeep singh mechanical engg. Welding blankets are used to protect surrounding areas from slag. Oct 23, 2015 working principle contd shielded metalarc welding with the transformer welding machine depends upon this fundamental fact. Contents safe essentials in welding introduction and principles of smaw. Choose from 500 different sets of welding chapter 5 flashcards on quizlet. Arc welding because of the versatility of the process and the simplicity of its equipment and operation, shielded metal arc welding is one of the worlds most popular welding processes. Emphasis placed on power sources, electrode selection, oxyfuel cutting, and various joint designs. Welding procedure specification shielded metal arc. An introduction to the shielded metal arc welding process. Corrosionpedia what is shielded metal arc welding smaw. This process has become very popular in the last 40 years because of its speed and ease of use. Shielded metal arc welding basic hobart institute of.
Shielded metal arc welding an overview sciencedirect topics. Describe the procedures and techniques for shielded metal arc welding. Shielded metal arc welding wall poster hobart institute of. Celebrating prezi s teacher community for teacher appreciation week. Highquality weld deposit with excellent appearance can be used to join many types of metals over a wide thickness range relatively high electrode efficiency and process duty cycle excellent weld penetration simplifies joint design the arc is visible and easy to use because of its greater tolerance for base plate contamination, flux. True false reverse polarity will generate more heat at the work piece than at the electrode. This process produces coalescence of metals by heating them with an arc between a covered metal electrode and the base metal work piece. The electrode also melts and adds metal to the puddle.
This installation, operation, and maintenance of arc welding equipment and the. This welding process goes by a variety of names, including flux shielded arc welding and manual metal arc welding. The equipment consists of a power supply, cables, and an electrode holder. For example, you might consider switching to shielded metal arc welding smaw to gas metal arc welding gmaw with a solid or metal coated wire, or opt to use lowmanganese filler metal. Learn welding chapter 5 with free interactive flashcards. Arc welding arc welding uses heat from an electrical source for the melting or fusion of metals.
This document is not an application manual and does not contain a complete statement of all factors pertaining to those topics. Shielded metal arc pipe welding lecture by shannon hansen. In this welding operation, an electric arc is generated by touching the tip of a coated electrode against the workpiece and withdrawing it quickly to a distance sufficient to maintain the arc as shown in the. Shieldedmetalarcweldingsmaw metal fabricating glossary. Shielded metal arc welding smaw is a fusion welding process that uses a consumable, fluxcoated electrode to create an arc between the electrode and the work piece. Striking an arc and making a weld electrode classifications welding. Of the six common arc welding methods, gas metal arc welding gmaw, shielded metal arc welding smaw, and fluxedcored arc welding are all examples of nonconsumable electrode processes, while gastungsten arc welding gtaw is an example of a consumable electrode process. May 10, 2018 the shield metal arc welding process has the advantages of being relatively simple and requiring a smaller variety of electrodes. Molten metal travels from the electrode via the electrical arc and is deposited into the work piece. Before starting actual arc welding the student should be fully aware of the dangers involved. Explain the fundamentals and techniques of shielded metal arc welding. Molten metal particles splash off the weld and can cause burns and fires. Arc welding by ryan saucier history of arc welding arc welding dates back to the late 1800 s first developed following the invention of ac electricity pioneered.
Ppt heat treatment and the effect of welding week 2 weld. Heat personal protective equipment ppe is used to protect the worker from heat, light and slag. Gas tungsten arc welding basic, 2inch pipe, or 6inch pipe digital video. The equipment is relatively simple, inexpensive, and portable.
Details of the exposure 57 formation of fumes 57 shielded metal arc welding 58 flux cored arc welding 62 gas metal arc welding 64 gas tungsten arc welding 65 plasma arc welding 67 submerged arc welding 67 oxygas welding 67 extent of fume. Informally, it is also referred to as stick welding. It is often referred to as stick welding or manual metal arc welding. It is also referred to as mag welding manual metal arc welding. Contains animated segments starring ges john mcgee character. Ppt shielded metal arc welding powerpoint presentation. It serves as an automated version of the traditional shielded metal arc welding process, employing an electrode holder attached to an inclined bar along the length of the weld.
Syllabus introduction to shielded metal arc welding smaw. Shielded metal arc welding 2 inch pipe uphill quantity. Arc welding aw a fusion welding process in which coalescence of the metals is achieved by the heat from an electric arc between an electrode and the work electric energy from the arc produces temperatures 10,000 f 5500 c, hot enough to melt any metal most aw processes add filler metal to increase volume and strength of weld joint rattandeep singh mechanical. Equipment for manual metal arc mma or sma welding twi.
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