Special studies on mutagenicity of welding fumes 55 appendix a. Take a close look at your process and what youre using. 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. 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. Heat personal protective equipment ppe is used to protect the worker from heat, light and slag. Contains animated segments starring ges john mcgee character. Guidelines for shielded metal arc welding smaw warning this document contains general information about the topics discussed herein.
Once started, the process continues until the electrode is spent, allowing the. An introduction to the shielded metal arc welding process. 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. Once started, the process continues until the electrode is spent, allowing the operator to manage multiple gravity welding systems. It is also referred to as mag welding manual metal arc welding. Smaw safety by kent devine on prezi presentation software. Is commonly known as stick welding or manual arc welding is the most widely used arc welding process in the world can be used to weld most common metals and alloys. Basics of arc welding the arc is struck between the electrode and the metal. Mig metal inert gas mag metal active gas co2 carbon dioxide a low voltage 18. Shielded metal arc welding an overview sciencedirect. Describe how to select shielded metal arc welding equipment and supplies.
Welding procedure data sheets shall require a new welding procedure specification and or welding procedure data sheet. Applying shielded metal arc welding smaw techniques. 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. Contents safe essentials in welding introduction and principles of smaw. It involved a bare metal rod with no flux coating to give a protective gas shield. Gas tungsten arc welding basic, 2inch pipe, or 6inch pipe digital video. Students will use the shielded metal arc welding rubric to engage in self and peerevaluation. This arc welding safety brochure may be freely copied for educational purposes if distributed to welders and welding students at no additional charge. The equipment consists of a power supply, cables, and an electrode holder. Shielded metal arc welding basic hobart institute of. 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. Aug 18, 2016 this welding process goes by a variety of names, including flux shielded arc welding and manual metal arc welding. Molten metal particles splash off the weld and can cause burns and fires. It is often referred to as stick welding or manual metal arc welding.
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. Shielded metal arc welding basic, advanced, or pipe digital video. 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. Shielded metalarc welding smaw is the simplest and used for many joining processes. Corrosionpedia what is shielded metal arc welding smaw. Shielded metal arc welding wall poster hobart institute of. Shielded metal arc welding 2 inch pipe uphill quantity. The main components of the equipment required for welding are. Oct 23, 2015 working principle contd shielded metalarc welding with the transformer welding machine depends upon this fundamental fact. This process has become very popular in the last 40. This installation, operation, and maintenance of arc welding equipment and the. Heat the arc produced during welding can exceed 3000 degrees celsius.
The high temperature of this arc melts the metal to be welded, forming a molten puddle. After completing this learning unit you should be able to. Emphasis placed on power sources, electrode selection, oxyfuel cutting, and various joint designs. 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. Shielded metal arc pipe welding lecture by shannon hansen. The other two processes to be discussed, resistance spot figure 1. Winner of the standing ovation award for best powerpoint templates from presentations magazine.
Effects of welding on health i american welding society. 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. In addition the electric arc itself provides an additional safety hazard. This document is not an application manual and does not contain a complete statement of all factors pertaining to those topics. Molten metal travels from the electrode via the electrical arc and is deposited into the work piece. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Equipment for manual metal arc mma or sma welding twi. The teacher will evaluate each students performance using the. This process has become very popular in the last 40 years because of its speed and ease of use. More than 50% of industrial and maintenance welding currently is performed by this welding process. 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. Arc welding arc welding uses heat from an electrical source for the melting or fusion of metals. Shielded metal arc welding smaw 1g3g6g this course is designed to offer necessary theoretical and practical exposure to shielded metal arc welding process.
Basic shielded metal arc welding power sources power output is constant current cc type it has a drooping volt. Welding blankets are used to protect surrounding areas from slag. Certification will be in accordance with the requirement of aws d1. Celebrating prezi s teacher community for teacher appreciation week. 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. Download gmaw seminar report and ppt for mechanical engineering. May 10, 2018 the shield metal arc welding process has the advantages of being relatively simple and requiring a smaller variety of electrodes. Ppt shielded metal arc welding powerpoint presentation. The shield metal arc welding process commonly is used in general construction, shipbuilding, pipelines and other maintenance work. Principles the american welding society defines smaw as shielded metal arc welding smaw. True false electrode holders and ground clamps are rated according to the amount of current they may carry. Weldingchp 6 shielded metal arc welding flashcards quizlet.
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. Gas metal arc welding basic, advanced, or pipe digital video. Shielded metal arc welding smaw, or manual metal arc welding was first invented in russia in 1888. Mar 27, 2012 the fundamentals of shielded arc welding in a horizontal position. Gas tungsten arc welding basic, 2inch pipe, or 6inch pipe. This could mean changing consumables away from heavier wire, hilbert says. Before starting actual arc welding the student should be fully aware of the dangers involved.
Choose from 500 different sets of welding chapter 5 flashcards on quizlet. Students will strike and maintain an arc to run short beads as identified in the shielded metal arc welding activity sheet. True false a motor generator power source is designed to change dc current to ac current. A free powerpoint ppt presentation displayed as a flash slide show on id. 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.
Learn welding chapter 5 with free interactive flashcards. What is shielded metal arc welding 1 what is shielded metal arc welding. Proper selection and set up of equipment is necessary in order to achieve a reliable weld while maintaining a safe work environment. In this arc welding process, the electric current passes through a consumable electrode, usually in the form of a thin stick. This welding process goes by a variety of names, including flux shielded arc welding and manual metal arc welding. The high temperature arc and hot metal can cause severe burns. Informally, it is also referred to as stick welding. Shielded metal arc welding an overview sciencedirect topics. 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.
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. Shieldedmetalarcweldingsmaw metal fabricating glossary. This process produces coalescence of metals by heating them with an arc between a covered metal electrode and the base metal work piece. 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. Consumable electrode wire, having chemical composition simiilar to that of the parent material, is continuously fed from a. 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 electrode also melts and adds metal to the puddle. 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. The arc melts the end of the electrode wire, which is transferred to the molten weld pool. Shielded metal arc welding shielded metal arc welding shielded metal arc welding smaw welding. 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. The heat source is an arc maintained between a consumable electrode and the workpiece.
The melting action is controlled by changing the 1 amount of electric current that flows across the arc and 2. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. 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 metal arc welding smaw is the simplest, least expensive, and mostly widely used arc welding process figure 2. Syllabus introduction to shielded metal arc welding smaw. 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. 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. Identify the safety practices that should be observed when working with shielded metal arc welding. 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. 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 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. Shielded metal arc welding is one of the most widely used processes, particularly for short welds in production, maintenance and repair work, and for field construction. True false reverse polarity will generate more heat at the work piece than at the electrode. Ppt heat treatment and the effect of welding week 2 weld. The equipment is relatively simple, inexpensive, and portable. 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 procedure specification shielded metal arc. Striking an arc and making a weld electrode classifications welding.
Arc welding is a process that uses electricity to heat and melt the metal. Welding is the melting, flowing together, and freezing of metals under controlled conditions. Welding procedure specification shielded metal arc weldingsmaw. Explain the fundamentals and techniques of shielded metal arc welding. The fundamentals of shielded arc welding in a horizontal position. 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.
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