In other words, the local connection is the welding of some metal rod by using thermal energy. In the process of connecting is sometimes accompanied by pressure and additional material filler material , simple welding techniques have been found in the span of time between to BC, after the electrical energy is used to easily and rapidly advanced welding technology. In the beginning stages of technology development of welding, the welding is usually only used on a connection connection of the reparations that are less important. But after going through the experience and practice a lot and for a long time, and now the use of welding processes and the use of construction-las konsturksi is common in all countries in the world, National standards of welding techniques will help expand the scope of usage of the las connection and increase the size of the building construction that can be welded. Limitation problem Based on the above background, so that the discussion in this paper does not become widespread, so this paper will discuss and limited by the "SMAW Welding". Welding processes occur due to electric current flowing between the electrode and the welding materials form a heat that can reach C, thus making the electrodes and materials that will be welded to melt.
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In other words, the local connection is the welding of some metal rod by using thermal energy. In the process of connecting is sometimes accompanied by pressure and additional material filler material , simple welding techniques have been found in the span of time between to BC, after the electrical energy is used to easily and rapidly advanced welding technology. In the beginning stages of technology development of welding, the welding is usually only used on a connection connection of the reparations that are less important.
But after going through the experience and practice a lot and for a long time, and now the use of welding processes and the use of construction-las konsturksi is common in all countries in the world, National standards of welding techniques will help expand the scope of usage of the las connection and increase the size of the building construction that can be welded.
Limitation problem Based on the above background, so that the discussion in this paper does not become widespread, so this paper will discuss and limited by the "SMAW Welding". Welding processes occur due to electric current flowing between the electrode and the welding materials form a heat that can reach C, thus making the electrodes and materials that will be welded to melt.
Voltage source used there are two kinds of electric i. For URlas. To get a good welding results should pay attention to the things below: 1. Select the electrode to be used appropriately. Types of currents also try doing it. Types of appropriate polarity for DC currents. To form the arc current is short, do welding in a steady and orderly.
The direction of the appropriate welding speed with the electrode melt. To generate a good and constant arc, welders must keep the tip of the electrode and the surface of the base material remains the same. As for the best distance is equal to the diameter of the electrode is worn. Equipment needed for welding processes SMAW is the simplest equipment compared to other electric welding processes. The voltage source power source A voltage source is classified as a welding machine and AC DC welding machine, welding machine the welding transformer usually a AC, DC welding machine and in addition there's also a transformer equipped with a rectifier or diode current-shifter back and forth into direct current motor driving usually use a good diesel engines, motor gasoline and electric motors, are currently widely used welding machine DC because the DC have a several excess off on AC welding machine namely the bow steady and polarity can be arranged.
Wires and cables elektoda time ground cable and electrode cable Cable electrode cable functioning times and channel the flow of electricity from the welding machine and welding material to return to the welding machine. The size of the electrode cables and cable time should be large enough for the drain current, if less bulky will cause heat and damage the insulation on the wire cable that eventually harm welding.
In accordance with the regulations, the cable between the machine and the workplace should preferably be as short as possible. Use one cable no connection if the distance is less than 35 feet. If using more than one cable, the connection should be good by using a lock-type cable connectors. Cable connections at least 10 feet away from the operator. Holder and electrode clamp holder and claim period.
Electrode holder is useful to siphon electricity from the electrode cable to the electrode and the electrode as a handle so that the welder does not feel the heat at the time of weld. Clamps for cable links the useful life time of welding machines with materials usually have period clamps per for penjepitnya.
Clamps is very important because if the resulting flow loose clamps not stable so that welding can not run properly. Hammer Weld and wire brush chipping hammer and wire brush Weld is used to release the hammer and get of the slag weld metal on Weld weld metal with the road hitting or put on the area of the weld. Be warned clean up slag Wleding with a hammer because Weld will likely splashed into the eyes or to the other bodies.
Wire brush is used for: a clean the workpiece that will be welded b clean the welding slag that was already off of the line by the hammer blows of Welding. If DC, the polaritasnya must also be specified. To determine the source of electric current and polarity which is used to note a few things as follows. DC direct current -Flow: Continue in one direction, so the bow steady flame. This way will result in the melting of the material base of more than elektrodenya so that the results of las have a deep penetration, so both are used on the slow as well as welding beads and narrow weld for thick plates.
This way will result in the melting of the more so that the results of las have shallow penetration, as well as good used in thin plate welding with a welding bead width.
Electrode electrode Most electrode welding SMAW coated by a layer of flux, which served as the gasforming fluid protects the metal from the surrounding air contamination. In addition it is useful also to form the fluk slag welding also serves to protect the liquid surrounding air of las. Electrode layer is a conglomeration of komposisisnya chemical welding needs. The first two-digit or three-digit.
The last digit indicates the type of the chemical mixture of electrode coating. The Lighting Of The Bow There are two basic methods used to start pnyalaan the bow scraping method striking and memuku tapping method. The lighting of the arc starts with with a short circuit between the tip of the electrode and the workpiece surface. On the method of striking an electrode disentukan to the surface of the workpiece with a scraping movement like lighting a match.
So the electrode touches the work surface menggasilkan unstable arc, therefore it should be kept the distance between the tip of the electrode and the workpiece surface is equal to the diameter of the electrode is worn.
On the method of knocking of the electrode in vertical position perpendicular to the surface of the workpiece. The lighting of the arc starts with knocking or melambungkannya above the surface of the workpiece, so an electrode touching the work surface menggasilkan unstable arc, therefore it should be kept the distance between the tip of the electrode and the workpiece surface is equal to the diameter of the electrode is worn. If the withdrawal of the electrodes to make the distance between the electrode and the workpiece are late then the liquid metal will quickly freeze so the sticky electrodes on the workpiece.
When the electrode is lifted from the workpiece is difficult then immediately switch off the machine and remove the electrode from the workpiece. Do not ever remove the helmet or mask it is possible during the welding electrodes can produce bow. The diameter of the electrode The diameter of the electrode used in welding SMAW greatly affect her little big amper used. Usually on the electrode will be used already recommended limit on the magnitude of the amper, the position of the welding and polarity are used.
Amper The use of the amper during welding process relies heavily on large diamter small electrodes used. The electrode manufacturer has set his little big amper used, information on the magnitude of the amper worn usually found in packs of electrodes. For example, amaper is recommended for a particular electrode is ampere, on the implementation of the exercise will usually specify the magnitude of the amper in the middle between both these limits, namely in 95 ampere.
After the start of the weld, pengeturan amper back done until the results are good. Amper is too large can result in: a. Great kumungkinannya happen undercut e. Slag slag difficult to cleaned Amper too small can result in: a.
Maximum speed of welding is heavily dependent on skills welder welder , position, type of electrode shape and connection. Usually, if the speed is too fast, welding metal welds to cool down too rapidly, causing a form of deposit las be small with the pointy peaks. Conversely, if the travel speed too slow, deposit las reams became too high and wide. The corresponding speed is when generating deposit las, with a diameter equal to the maximum height and width of the elektoda three times the diameter of the electrode.
Change the angle of the electrode is very extreme affect the shape of the welding deposit, hence the angle of the electrode is very important in the process of welding.
The angle of the electrode consists of two positions, i. Work angle is the angle that is formed from a horizontal line perpendicular to the direction of welding. The welding direction angle is the angle in the direction of welding against vertical line and may be changed from 15 to 30 degrees.
Below are the applications of SMAW welding: Electric arc that goes on between the tip of the electrode and the base material will melt the tip of the electrode and the base material of a part. Membrane electrodes were burnt will melt and produce a gas that protects the tip of the crater of las elekroda, electric arc against the influence of the outside air.
Liquid membrane electrodes freezes will memutupi the surface of the weld. Because it is simple and easy in transport equipment and accessories, making the process of SMAW has broad applications ranging from refinery piping to pipelines, and even for welding under the sea in order to improve the structure of the offshore oil platforms. SMAW can be done in a variety of positions or locations that you can reach with an electrode. SMAW process used to weld a variety of ferrous and non-ferrous metals, including carbon steel and low alloy steel, stainless steel, nickel alloys-alloy, cast iron, and some copper alloys.
COM 2. Learn more about Scribd Membership Home. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Tugas Makalah Pengelasan Copy. Uploaded by Petrick Andries. Document Information click to expand document information Description: smaw. Date uploaded Feb 01, Did you find this document useful?
Is this content inappropriate? Report this Document. Description: smaw. Flag for Inappropriate Content. Download Now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Limitations On Issue Understanding 2 SMAW welding Application of the use of welding SMAW The welding deposit forms and causes. Ahmad Tahir. Abu Ayyas Alklatainy.
Arul Winstone Devadhas.
TEKNIK LAS SMAW - Komponen Dan Prosedur Pengelasan Yang Baik
Las adalah sebuah teknik penyambungan besi dengan cara dibakar. Sedangkan mesin las listrik adalah mesin yang digunakan untuk menyambung besi yang sumber dayanya didapat dari tenaga listrik. Pada awalnya, teknik pengelasan bukan dengan listrik melainkan dengan gas. Teknik pengelasan ini disebut dengan teknik pengelasan karbit yaitu dengan menggunakan gas acetylena yang dibakar. Nama lain dari teknik las listrik dengan menggunakan mesin las listrik ini adalah teknik las busur listrik. Karena teknik las listrik dari mesin las listrik ini adalah dengan menggunakan nyala busur listrik yang diarahkan ke permukaan logam yang akan disambung. Berdasarkan penemuan benda-benda sejarah, dapat diketahui bahwa teknik penyambungan logam telah diketahuiu sejak jaman prasejarah, misalnya pembrasingan logam paduan emas tembaga dan pematrian paduan timbal-timah.
Fauzan Dengan kata lain, las adalah sambungan setempat dari beberapa batang logam dengan menggunakan energi panas. Dalam proses penyambungan ini adakalanya disertai dengan tekanan dan material tambahan filler material ,Teknik pengelasan secara sederhana telah diketemukan dalam rentang waktu antara sampai SM. Setelah energi listrik dipergunakan dengan mudah dan teknologi pengelasan maju dengan pesatnya. Pada tahap-tahap permulaan dari pengembangan teknologi las, biasanya pengelasan hanya digunakan pada sambungan-sambungan dari reparasi yang kurang penting.
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