Advantages and disadvantages of arc welding at wasatch steel, some of our most popular purchases are steel welding products. Arc welding machine instruction manual pdf download. The electrode and the work are part of an electric circuit. Process mode manual, semiautomatic, machine and auto one of the four process modes should be checked in this section based on the following definitions.
The heat of the arc melts the parent metal and the electrode which mix together to form, on cooling, a continuous solid mass. Stick welding requires you to have more skill because. 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. This circuit begins with the electric power source and includes the welding cables, an electrode holder, a workpiece connection, the workpiece. General industry electrical hazards including arc flash. Ppt heat treatment and the effect of welding week 2 weld. Printouts can be made of each lesson if teachers want to hand hard copies to the students in the class. Advantages and disadvantages of arc welding wasatch steel. Submerged arc welding is an arc welding process in which the arc is concealed by a blanket of granular and fusible flux 166, 37. 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. Wire welding is considered as a semiautomatic process, using a wire electrode thats conveniently fed through a welding gun. 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.
Welding on closed containers, such as tanks, drums, or pipes, can cause them to blow up. If inch speed is too fast, the wire will tend to stick on starting. 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. Ppt welding safety powerpoint presentation free to. 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. Gas metal arc welding an overview sciencedirect topics.
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. 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. Connects to 1 phase 230v 5060hz readably available power point onboard. 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. The arc moves along the joint line and as it does so, excess flux is recycled via a hopper.
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 electrode is either a rod that simply carries current between the tip and the work, or a rod or wire that melts and. Electrode must be fed downward at a constant rate to keep the right arc length. This process is slow but when done right it produces the highest quality weld. Be sure the insulating shields on the electrode holder are in place and in good condition. To minimize distortion caused by heat of welding 2. Arc welding is one method for joining metals, and it is indispensable for the. This process generates the heat through an application of electric current. How to stick welding complete guide tips and safety measures. Gas tungsten arc welding gtaw or tungsten inert gas tig welding.
Gasshielded arc welding of aluminium gasshielded welding can be divided into the tungsten gasshielded welding and the. Manual metal arc welding introduction the terms commonly used when referring to manual metal arc welding are m. Covered electrodes for manual metal arc welding of high strength steel. Arc welding safety safe welding practices shall always be used. What separates tig welding from most other welding processes is the way the arc is created and how the.
The arc is formed between the actual work and an electrode stick or wire that is manually or mechanically guided along the joint. Accidental contact of electrode to metal objects can cause sparks, explosion, overheating, or fire. Ppt heat treatment and the effect of welding week 2 weld decay powerpoint presentation free to download id. An ivyvilos production featuring welding instructor, brian barnes. 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.
Tig welding is also a slang term commonly used for gas tungsten arc welding or gtaw. We manufacture a full line of products for welding schools, light to heavy duty metal fabricators, maintenance shops, home use and more. 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. Grantee materials by topic occupational safety and. Tig welding is a manual welding process that requires the welder to use two hands to weld. Apr 26, 20 ivy techs school of advanced manufacturing and industrial technology. 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. The heat from the torch allows for the melting and mixing of the base metal and filler metal to form a solid weld. This produces a thermal efficiency as high as 60% compared with 25% for manual metal arc.
This theme is perfect for presentation on ironwork, spark, skill, etc. Welders can be stationary, electric powered or portable, dieselgas powered. Depending on the type shielding gas, this process is of also known as co. 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. The welding society defines carbon arc welding as an. Be sure youre standing on a dry floor and that your hands are dry when you operate the welding unit.
It is also referred to as mag welding manual metal arc welding. Manual arc welding trade of plumbing phase 2 module 3 unit 5 weld defects and their causescontinued undercut weld defects and their causes. Explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection. Welding processes are fairly simple to understand, and basic techniques can be learned quickly. Shielded metal arc welding ppt download slideplayer. Industrial worker at the factory welding closeup powerpoint. 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.
This is the most popular welding process capable to produce a great variety of welds. Shielded metal arc welding stick welding, manual metal arc. With disconnected ln8 or ln9 wire feeders, set the inch speed for the slow rate. Free industrial worker at the factory welding closeup powerpoint templates are industrial worker with white background that you can download to make powerpoint presentations. Shielded metal arc welding smaw manual arc welding heat for welding generated by electric arc established between fluxcovered consumable metal rod. In arc welding, the intense heat needed to melt metal is produced by an electric arc with the help of a welding power supply. Welding power source cables electrode holder earth clamp. It involves striking an arc between a covered metal electrode and a workpiece. The fusing of two or more pieces of metal together by using the heat produced from an electric arc welding machine. Nov 18, 20 arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. 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. Remaining fused slag layers can be easily removed after welding. Manual metal arc welding mma, smaw or stick welding twi.
The molten electrode metal fills the weld gap and joins the work pieces. 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. Presentations and quizzes explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection. 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. Manual metal arc mma welding is the most flexible and one of the most widely used arc welding processes. 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. 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. Powerpoint ppt presentation free to view welding jigs and fixtures purpose 1. 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.
Gmaw circuit diagram 1 welding torch 2 workpiece 3 power source 4 wire feed unit 5 electrode source 6 shielding gas supply 6. Arc welders use a powerful electric arc to make and repair plain, coated, or treated metal items. It involved a bare metal rod with no flux coating to give a. An electric current, in the form of either alternating current or direct current from a. As the arc is completely covered by the flux layer, heat loss is extremely low. Stick welding also known as shielded metal arc welding or manual metal arc welding is one of the most popular welding processes. Shielded metal arc welding employs the heat of the arc to melt the base metal and the tip of a consumable covered electrode.
The electrode is then removed, breaking the arc between the electrode and the metal. Safety training for workers in chemical, refinery, and. Shielded metal arc welding smaw, or manual metal arc welding was first invented in russia in 1888. 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.
Gmaw in the gmaw process, also known as to mig metal inert gas process, the welding heat is produced by an arc struck between a continuously fed metal wire electrode and the workpiece. Ppt manual metal arc welding powerpoint presentation free to. Ground equipment and place it on an independent circuit with the correctsized fuse or circuit breaker. Welding is a common process for joining metals using a large variety of applications.
This subject is very complicated and only these precautions related to arc welding will be discussed in this brochure. 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. 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. Because the welder must maintain a short arc length, great care and skill are required to prevent contact between the electrode and the workpiece. The electrode is a solid wire, fed continuously through the arc into the weld pool, which ultimately becomes the filler metal at the 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. Tig welding is the international standardised designation for this welding method. Both the rod and the surface of the work piece melt to create a weld. Arc welding processes uses an electrical power supply to create and maintain an electric arc between an electrode and. According to dsen 24063 this welding process has number 141.
Manual metal arc welding mma, smaw or stick welding. 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. Shield metal arc welding smaw also known as manual metal arc welding mmaw page 3 of 21. 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. 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. The carbon arc welding caw process is the oldest of all the arc welding processes and is considered the beginning of arc welding. Heat for saw is generated by an arc between a bare, solid metal or cored consumablewire or strip electrode and the workpiece. Tig welding is the most difficult of the processes to learn, and is the most versatile when it comes to different metals.
It involved a bare metal rod with no flux coating to give a protective gas shield. Rev date 09302014 printed copies of this document are uncontrolled. Manual gas tungsten arc welding is often considered the most difficult of all the welding processes commonly used in industry. Ppt arc welding powerpoint presentation free to download. Manual arc welding trade of plumbing phase 2 module 3 unit 5 weld defects and their causes. Some hazards are common to both electric arc and oxygenfuel gas welding. Manual metal arc welding what type of power source is required by the mma process to ensure relatively constant heat. Welding processes and information about different types of welds. This bulletin is written with the arc welding operator in mind, containing both mandatory safety practices and those based on shop experience. Arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. Manual metal arc welding was first invented in russia in 1888. Depending on medium on the quality of weld productivity welding economics types of welding processes arc welding process manual metal arc welding mmawsmaw. The flying sparks, hot workpiece, and hot equipment can cause fires and burns.
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