Sep 06, 20 for arc welding, you need to have an arc welding hood. Mar 21, 2018 during the arc welding process, live electrical circuits are used to create a pool of molten metal. Cop manual electric arc welding draft for consultation feb 200 2 1 1. Metal inert gas welding or mig welding is based on the electric arc welding process, where completion of an electric circuit between positive and negative poles creates an electric arc, which. The following operations require full face protection by using either a welding helmet or a hand shield. 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. Introduction the electric arc welder remains one of our most useful and. Even after the welding job is done, tiny pieces of slag can ping off the weld. Apart from welding aluminum, the tig welding process requires dc electric power. Welders can be stationary, electric powered or portable, dieselgas powered. Welding safety safety toolbox talks meeting topics.
Electric shock is the most serious hazard posed by welding and can result in serious injuries and fatalities, either through a direct shock or from a fall from height. The arc welding and cutting process uses electric current and two welding leads. Introduction the electric arc welder remains one of our most useful and timesaving pieces of shop equipment. Welding is safe when precautions are taken, but as in most industries, exposure to certain hazards occur and correct usage and procedures must be followed. When welders overlook these safety precautions, they can encounter such dangers as electric shock, fire and explosion, arc radiation and overexposure to fumes and gases. Arc welding can be a hazardous activity, even for the most experienced worker. Arc welding is a safe occupation when proper precautions are taken. Health and safety in welding welding poses a range of hazards to your health. Shielded metalarc welding the shielded metalarc welding process, referred to as metallicarc welding, arc welding, or stick welding, is extensively used in welding ferrous and nonferrous metals. There are many ways in which welding can damage your health. Some hazards are common to both electric arc and oxygenfuel gas welding. Ground equipment and place it on an independent circuit with the correctsized fuse or circuit breaker. Work in a well ventilated area extraction fans should be used when welding inside a workshop. Gas metal arc welding gmaw, also known as metal inert gas mig.
The consequences of failing to adhere to the correct safety procedures or in failing to. Almost every farm, ranch, and vocational agriculture shop is equipped with one or more welders which are used for fabrication, repair, andor educational programs. During all electric welding processes, operators must use safety goggles and a hand shield or helmet equipped with a suitable filter glass to protect against the intense ultraviolet and infrared rays. Code of practice safety and health at work for manual electric arc welding 1 1. Electric shock hazard page 8 installation use maintenance 3. Carbon arc welding and gas welding requires a minimum shade of 14 and 4 respectively. In the welding process, a filler metal, and the work piece are heated to form the weld using an electric arc or combustion gas. For gas cutting, welding, or brazing, the intensity of the light is much less than from arc welding, cutting or gouging processes.
Mig welding safety and technique 2010 gmaw safetycare. Safety practices in welding introduction arc welding is a safe occupation when sufficient measures are taken to protect the welder from potential hazards. Similarly, electric shock originating from the electrical supply system can be prevented. Electric arc radiation can burn eyes and skin the same way as strong sunlight. Depending on the heat requirement, wall thickness, etc. Welding operators face an array of hazards, including electric shock, fumes and gases, fire and more. Flux cored arc welding fcaw gas metal arc welding gmaw, also known as. Two metals are joined by generating an electric arc between a covered metal electrode and the base metals. 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. The welding arc creates extreme temperatures, and may pose a significant fire and explosions hazard if safe practices are not followed. Gas tungsten arc welding gtaw or tungsten inert gas tig welding. If you will be working in a confined space, many special osha regulations and jobsite requirements.
Chapter 41 welding and cutting 41 welding and cutting welding is a method of joining metal parts together by heating them until they melt and pressing them together. The arc energy is provided by a power supply unit that furnishes direct or alternating current. Therefore, when welding, you are at risk of experiencing an electric shock. Regarding safe welding practices, the principal hazards are associated with electric. Good safety glasses should have side shields in order for them to offer full protection to both the front and. Welding hazards and safety precautions high speed training. The welding process and some types of equipment can create a lot of noise, so its.
Health, safety and accident prevention arc welding twi. Arc welders use a powerful electric arc to make and repair plain, coated, or treated metal items. Standard machines for arc welding service shall be designed and constructed to carry their rated load with rated temperature rises where the temperature of the cooling air does not exceed 40 deg. One welding lead is connected to the electric power supply while the other lead is attached to the work surface. Welders can be stationary, electric powered or portable, diesel gas powered. But, if safety measures are ignored, welders face an array of hazards which can be potentially dangerous, including electric shock, fumes and gases, fire and explosions and more. Arc welding is a safe occupation when sufficient measures are taken to protect the welder from potential hazards. A person may get an electric shock hazard if incidentally the hands or other part of the body create a bridge between the welding supply e. Touching live electrical parts can cause fatal shocks or severe burns.
Lying on the floor to weld the underside of workpiece. Shielded metal arc welding is the process of joining two metal pieces using a flux covered electrode which is melted in an electric arc and becomes a fused part of the pieces being welded. Safety is a critical consideration for any welding project. This article gives guidelines on health and safety considerations when arc. The wrong and right ways to carry out arc welding processes are shown schematically in the figure at the end of this page. Proper maintenance of electrical equipment and extension cords will insulate the welder from electrical sources.
It also describes the steps and measures to be taken in protecting workers from the hazards arising from the work, and. Arc rays and spatter can injure eyes and burn skin. When these measures are overlooked or ignored, however, welders can encounter such dangers as electric. Welding hazards pose an unusual combination of safety and health risks. Safety and health at work for manual electric arc welding.
Very important to note that these safety glasses for oxygen acetylene will not protect you from the uv radiation generated by arc welding. Welding safety procedures thompson rivers university. It also describes the steps and measures to be taken in protecting workers from the hazards arising from the work. When these measures are overlooked, welders can encounter such dangers as electric shock, overexposure to fumes and gases, arc radiation, and fire and explosion. Shock and exposure to the process requires precautions.
The wrong and right ways to carry out arc welding processes are shown. For galvanised metal, stainless steel and hardfacing alloys in fact anything other than mild steel at least a fume mask should be used, preferably an air fed helmet, in addition to ventilation. Electric shocks can result in explosions, fire and even death. When these measures are overlooked or ignored, however, welders can encounter such dangers as electric shock, overexposure to fumes and gases, arc radiation. Even though the output voltage of a manual electric arc welding. The welding arc is established by touching the base metal plate with the electrode and immediately withdrawing it a short distance. Welding and cutting safety test flashcards quizlet. These can be obvious straight away such as electric shock or exposure to cadmium fumes, or they may show up in the long term such as lung and breathing disorders. Jan 25, 2020 as a arc welding safety guideline, if nonhazardous metals are being welded, ventilation systems that move a minimum of 2000 cubic feet per minute of air per welder is sufficient. Electric shock hazard of manual electric arc welding work. Arc radiation air contamination electric shock fire and explosion safety standards compressed gases cleaning other welding hazards safety data sheets. Avoid welding in wet or damp areas, to prevent electrical shock. Apr 08, 2010 metal inert gas welding or mig welding is based on the electric arc welding process, where completion of an electric circuit between positive and negative poles creates an electric arc, which.
Welding equipment shall be chosen for safe application to the work to be done as specified in paragraph b of this section. What precautions should i take to prevent an electrical shock. Most of these welders are typically acdc, 240 volt transformer types using electricity as the energy source. It also describes the steps and measures to be taken in. Arc welding procedures, techniques, and welding safety. The welding process joins metals together using pressure, heat, flame or electric arc. At the instant the electrode touches the plate, a rush of current flows through the point of contact. A welding helmet or hand shield with filter plate and cover plate is mandatory for eye protection from the harmful rays of the arc. When others are in the vicinity of the arc cannot be seen the electric welding processes, the area must be screened so. For galvanised metal, stainless steel and hardfacing alloys in fact anything other than mild steel at least a fume mask should be used. Welding and cutting processes there are more than 80 processes used in welding and cutting. And the worst part is it may happen before or after the welding is done. Nema standards or the safety standards for arc welders as determined by the.
As the electrode is withdrawn, an electric arc is formed, melting a spot on the plate and at the end of the. Arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. Tig welding safety there are many threats associated with this welding like an electric shock, radiation, welding fumes, and so on, even if you do it on your portable tig welding machine. It has many applications for producing a vast assortment of metal products. Protect skin and eyes from uv light, and shield your welding area from the eyes of onlookers. 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. Nov 18, 20 arc welding it is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. The hazards associated with this process are highlighted.
Electric arcs emit both ultraviolet and infrared rays. Arc welding safety precautions afrox welding cutting safety. Follow electrical safety procedures to prevent electrical hazards. Arc welding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals when cool result in a binding of the metals.
Make sure that applicable hot work procedures are followed. Shielding gas like argon protects the weld bead and the metal being welded from ambient air. Rev date 09302014 printed copies of this document are uncontrolled. For arc welding, you need to have an arc welding hood. Five potential welding safety hazards to avoid lincoln electric. While the welding arc may reach temperatures of 10,000 degrees fahrenheit, the real danger is not from the arc itself, but rather the intense near the arc and the heat, sparks and spatter created by the arc. In order to prevent electrical shock, radiation exposure, and burns when. Arc welding is a safe occupation when sufficient safety precautions are in place to protect the welder from potential hazards. Regarding safe welding practices, the principal hazards are associated with electric shock. Arc welding is the most common type of welding process used in construction. It is a type of welding that uses a welding power supply to create an electric arc between a metal stick electrode and the base material to melt.
Resistance welding is a metaljoining process where welding heat is generated at the joint by the resistance to the flow of electric current. Do not watch the electric arc without proper eye protection helmet or face shield with a no. Electric shocks can result in explosions, fire and even. Whether youre responsible for a crews safety or are an independent fabricator, these tips will help you to keep yourself and others safe. Follow the electrical welding safety procedures to prevent electrical hazards.
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. During the arc welding process, live electrical circuits are used to create a pool of molten metal. Do not harm the welding cables, electrode holder, ground clamp, or welding machine in any way. If you work with or near a welding operation, the following general precautions should. It is a type of welding that uses a welding power supply to create an electric arc between a metal stick electrode and the base material to melt the metals at the point of contact. When working with arc welding equipment safety precautions involve planning for protection from the following. The arc welding process requires a live electrical circuit. Arc welding uses intense heat to melt metal, causing the molten. This article gives guidelines on health and safety considerations when arc welding to ensure safe practice and prevent accidents. Being a flux shielded process it is possible to arc weld in a strong breeze, so extraction can be added close to the welding area. Welding, cutting, and allied processes supersedes ansi z49. When welding hazardous materials or coatings, then an air respirator with a filter designed for that purpose should be used. Heat is produced by the arc, which in turn, melts the metal and mixes the molten deposits of the coated electrode. What will we do at the worksite to prevent injuries from arc welding and electrical hazards.
699 1192 1007 1239 941 1670 1246 490 1217 869 943 1018 818 819 285 1613 738 1080 874 1436 874 13 939 1640 1551 1313 788 1427 824 1333 1073 65 888 241 734 1004 899