Apr 26, 20 ivy techs school of advanced manufacturing and industrial technology. Accidental contact of electrode to metal objects can cause sparks, explosion, overheating, or fire. Arc welding safety safe welding practices shall always be used. The adobe flash plugin is needed to view this content. The principle of tig welding tig welding is an electric arc welding process in which the fusion energy is produced by an electric arc burning between the workpiece and the tungsten electrode. 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 electrode and the work are part of an electric circuit. An electric current, in the form of either alternating current or direct current from a. This process generates the heat through an application of electric current. Arc welding machine instruction manual pdf download. This subject is very complicated and only these precautions related to arc welding will be discussed in this brochure.
To minimize distortion caused by heat of welding 2. If inch speed is too fast, the wire will tend to stick on starting. Shielded metal arc welding smaw, or manual metal arc welding was first invented in russia in 1888. The output circuit of an arc welder is controlled at a safe voltage but this safe voltage can also kill if given ideal conditions. Equipment to perform gas metal arc welding, the basic necessary equipment is a welding gun a wire feed unit a welding power supply an electrode wire a shielding gas supply. We manufacture a full line of products for welding schools, light to heavy duty metal fabricators, maintenance shops, home use and more. Connects to 1 phase 230v 5060hz readably available power point onboard. General industry electrical hazards including arc flash.
Gas metal arc welding an overview sciencedirect topics. Wire welding is considered as a semiautomatic process, using a wire electrode thats conveniently fed through a welding gun. The arc welding is a fusion welding process in which the heat required to fuse the metal is obtained from an electric arc between the base metal and an electrode. Manual gas tungsten arc welding is often considered the most difficult of all the welding processes commonly used in industry. 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.
Ppt heat treatment and the effect of welding week 2 weld. Manual metal arc welding introduction the terms commonly used when referring to manual metal arc welding are m. Arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. Stick welding requires you to have more skill because. Welding power source cables electrode holder earth clamp.
Industrial worker at the factory welding closeup powerpoint. Welders can be stationary, electric powered or portable, dieselgas powered. With disconnected ln8 or ln9 wire feeders, set the inch speed for the slow rate. The electrode is either a rod that simply carries current between the tip and the work, or a rod or wire that melts and. Disconnect both battery cables before welding on a vehicle place work clamp as close to the weld as possible techniques for basic weld joints arc length arc length normally one electrode diameter, when ac welding with a balled end electrode when dc welding with a pointed electrode, arc length may be much less than electrode diameter figure. This bulletin is written with the arc welding operator in mind, containing both mandatory safety practices and those based on shop experience. Welding sparks can cause fires and explosions sparks and spatter from the welding arc can spray up to 35 feet from your work flammable materials should be removed from the welding area or shielded from sparks and spatter have a fire extinguisher ready inspect area for fires 30 minutes after welding.
Arc welders use a powerful electric arc to make and repair plain, coated, or treated metal items. Shield metal arc welding smaw also known as manual metal arc welding mmaw page 3 of 21. Mig metal inert gas mag metal active gas co2 carbon dioxide a low voltage 18. Process mode manual, semiautomatic, machine and auto one of the four process modes should be checked in this section based on the following definitions. Stick welding also known as shielded metal arc welding or manual metal arc welding is one of the most popular welding processes. Ground equipment and place it on an independent circuit with the correctsized fuse or circuit breaker.
Ppt manual metal arc welding powerpoint presentation free to. Taking onsite welding of line pipes, for example, the flash butt welding method requires only about 3 minutes to weld two pipes 750 mm in diameter and 19 mm in wall thickness, whereas the ordinary automatic arc welding process takes 90 to 120 minutes to do the same4. Nov 18, 20 arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. This circuit begins with the electric power source and includes the welding cables, an electrode holder, a workpiece connection, the workpiece. Dec 31, 2017 in arc welding, the intense heat needed to melt metal is produced by an electric arc with the help of a welding power supply. 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 between the electrode and the metals to be joined. Depending on the type shielding gas, this process is of also known as co.
Shielded metal arc welding stick welding, manual metal arc. An ivyvilos production featuring welding instructor, brian barnes. According to dsen 24063 this welding process has number 141. Ppt welding safety powerpoint presentation free to. Shielded metal arc welding smaw also known as manual metal arc welding mma or mmaw, flux shielded arc welding or stick welding is a process where the arc is struck between the metal rod electrode flux coated and the work piece, both the rod and work piece surface melt to form a weld pool. Welding health and safety ss832 march 2015 page 4 gas metal arc welding gmaw or mig metal inert gas welding is an arc welding process wherein coalescence is produced by heating with an arc between a continuous filler metal electrode typically a steel alloy wire and the work. Manual metal arc welding mma or mmaw, also known as shielded metal arc welding smaw, flux shielded arc welding or stick welding, is a process where the arc is struck between an electrode flux coated metal rod and the work piece. Both the rod and the surface of the work piece melt to create a weld. Advantages and disadvantages of arc welding wasatch steel. Grantee materials by topic occupational safety and. Manual metal arc welding mma, smaw or stick welding twi.
By its nature, welding produces fumes and noise, gives off radiation, involves electricity or gases, and has the potential for burns, shock, fire, and explosions. It involved a bare metal rod with no flux coating to give a. The flying sparks, hot workpiece, and hot equipment can cause fires and burns. This process is slow but when done right it produces the highest quality weld. 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. The arc is struck between the electrode and the metal.
Safety training for workers in chemical, refinery, and. Explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection. Advantages and disadvantages of arc welding at wasatch steel, some of our most popular purchases are steel welding products. Presentations and quizzes explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection.
Manual arc welding trade of plumbing phase 2 module 3 unit 5 weld defects and their causescontinued undercut weld defects and their causes. Submerged arc welding is an arc welding process in which the arc is concealed by a blanket of granular and fusible flux 166, 37. Depending on medium on the quality of weld productivity welding economics types of welding processes arc welding process manual metal arc welding mmawsmaw. Arc welding processes uses an electrical power supply to create and maintain an electric arc between an electrode and. Shielded metal arc welding employs the heat of the arc to melt the base metal and the tip of a consumable covered electrode. Welding occurs in several locations, from outdoors settings on rural farms and construction sites to inside locations, such as factories and job shops. Electrode must be fed downward at a constant rate to keep the right arc length. We offer tools and products for all varieties of welding formats, plus the expertise and knowhow to help you get started on your latest welding project. Manual metal arc mma welding is the most flexible and one of the most widely used arc welding processes. How to stick welding complete guide tips and safety measures. Powerpoint ppt presentation free to view welding jigs and fixtures purpose 1. Welding on closed containers, such as tanks, drums, or pipes, can cause them to blow up. Manual arc welding trade of plumbing phase 2 module 3 unit 5 weld defects and their causes.
Be sure youre standing on a dry floor and that your hands are dry when you operate the welding unit. This produces a thermal efficiency as high as 60% compared with 25% for manual metal arc. 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. The fusing of two or more pieces of metal together by using the heat produced from an electric arc welding machine. The carbon arc welding caw process is the oldest of all the arc welding processes and is considered the beginning of arc welding. Welding processes and information about different types of welds. Manual metal arc welding was first invented in russia in 1888. The welding society defines carbon arc welding as an. The heat from the torch allows for the melting and mixing of the base metal and filler metal to form a solid weld. Ppt arc welding powerpoint presentation free to download.
It is also referred to as mag welding manual metal arc welding. Oxyacetylene welding by matt scott introduction oaw is a welding process that heats the base metal with a controlled mixture of acetylene and oxygen gas. The arc is formed between the actual work and an electrode stick or wire that is manually or mechanically guided along the joint. Welding hazards pose an unusual combination of safety and health risks. Tig welding is the international standardised designation for this welding method. Gas metal arc welding gmaw, also called metal inert gas mig welding, is an arc welding process in which the heat for melting the metal is generated by an electric arc between a consumable electrode and the metal fig. Covered electrodes for manual metal arc welding of high strength steel. Manual metal arc welding mma, smaw or stick welding. Printouts can be made of each lesson if teachers want to hand hard copies to the students in the class. The heat of the arc melts the parent metal and the electrode which mix together to form, on cooling, a continuous solid mass.
Shielded metal arc welding ppt download slideplayer. Gas tungsten arc welding gtaw or tungsten inert gas tig welding. Because the welder must maintain a short arc length, great care and skill are required to prevent contact between the electrode and the workpiece. When arc welding in a confined area, such as a boiler, tank, or the hold of a ship, bear in mind that all the hazards associated with normal arc welding are amplified, so the precautions mentioned here are even more important. Some hazards are common to both electric arc and oxygenfuel gas welding. Arc welding is a process that fuses metal by heating it to a melting temperature with an electric arc created between an electrode and the metals being joined. Ppt heat treatment and the effect of welding week 2 weld decay powerpoint presentation free to download id. The electrode is a solid wire, fed continuously through the arc into the weld pool, which ultimately becomes the filler metal at the weld. The molten electrode metal fills the weld gap and joins the work pieces. Gasshielded arc welding of aluminium gasshielded welding can be divided into the tungsten gasshielded welding and the.
Dec 31, 2017 stick welding which is also known as shielded metal arc welding smaw uses an electrode with fixed dimensions along with a power source for joining different kinds of metals. Tig welding is also a slang term commonly used for gas tungsten arc welding or gtaw. It involved a bare metal rod with no flux coating to give a protective gas shield. This theme is perfect for presentation on ironwork, spark, skill, etc. In arc welding, the intense heat needed to melt metal is produced by an electric arc with the help of a welding power supply. Stick welding is a manual arc welding process in which a covered metal stick electrode is used as the filler metal for making the weld.
Rev date 09302014 printed copies of this document are uncontrolled. Welding is a common process for joining metals using a large variety of applications. The following lesson plans are based around the lesson slides in the smaw powerpoint presentations and should be used in conjunction with the units of study. Tig welding is the most difficult of the processes to learn, and is the most versatile when it comes to different metals. Heat for saw is generated by an arc between a bare, solid metal or cored consumablewire or strip electrode and the workpiece. 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. Presented byphani sridhar application of welding in various industries application of welding in various industries definition of welding welding process is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of pressure alone and with. The electrode is then removed, breaking the arc between the electrode and the metal. Shielded metal arc welding smaw manual arc welding heat for welding generated by electric arc established between fluxcovered consumable metal rod. The arc moves along the joint line and as it does so, excess flux is recycled via a hopper.
This is the most popular welding process capable to produce a great variety of welds. Be sure the insulating shields on the electrode holder are in place and in good condition. The electric arc is produced when two conductors are touches together and then separated by a small gap of 2 to 4 mm, such that the current continues to flow, through the air. What separates tig welding from most other welding processes is the way the arc is created and how the. Manual metal arc welding what type of power source is required by the mma process to ensure relatively constant heat. Tig welding is a manual welding process that requires the welder to use two hands to weld. Jun 08, 2018 stick welding also known as shielded metal arc welding or manual metal arc welding is one of the most popular welding processes.
409 605 1632 972 505 45 67 1602 802 1317 1078 1441 1041 667 402 1268 1170 878 424 713 579 1181 1315 372 584 507 152 403 1007 890 1313 1443 537 1100 1438