![]() Plasma Arc Welding (PAW) is similar to TIG welding in which an arc, shielded by an inert gas, creates the necessary heat to melt the metals involved. ![]() Water is often used to cool the torch and cables. commonly argon, helium, or carbon dioxide) also flows around the arc to minimize atmospheric interactions. A separate filler rod is fed into the molten base metal, if needed. An electric arc between a tungsten electrode and the base metal is created. Gas Tungsten Arc Welding (GTAW) is commonly known as "TIG" welding. As arcing occurs, the electrode instantly melts and a shielding gas, such as argon, carbon dioxide, or helium, is supplied through the torch tip. wire) from a spool is used to supply filler metal directly from the torch tip to the weld. Gas Metal Arc Welding (GMAW) is commonly known as "MIG" welding. The electrode is consumed as it moves down the length of the weld joint and the "slag" must cool and later be chipped away. The flux coating quickly forms a protective "slag" during welding, which produces a gas shield that decreases exposure to oxygen. A flux-covered electrode is used to form a gas shield around the molten weld pool. Shielded Metal Arc Welding (SMAW) is commonly known as "stick" welding. A protective shield of gas, vapor, or slag is used to cover the arc and molten pool to prevent or minimize contact or molten metal with air. Oxides and nitrides form, which destroy the strength of the weld. Metals at high temperatures can react chemically with elements in the air (oxygen and nitrogen). This heat melts both the base metal and the electrode, producing a pool of molten metal. The arc produces a temperature of about 6,500 deg. ![]() The work cable connects to the work piece and the electrode cable creates an arc across the gap when the energized circuit and the electrode tip touches the workpiece and is withdrawn (yet still in close contact). Power sources for arc welding can be either alternating (AC) or direct (DC) current. The electrode can either be a rod, with the purpose of simply carrying the current between the tip and the work, or it may be a specially prepared rod or wire that not only conducts current, but also melts and supplies filler metal to the joint. The arc is formed between the actual work piece and an electrode (stick or wire) that is manually or mechanically guided along the joint. In arc welding, the intense heat needed to melt metal is produced by an electric arc. ![]() For more information on the safe use, handling, and transport of compressed gas cylinders, click here. These gases are commonly supplied in compressed gas cylinders, which can pose additional handling and transport hazards. Gases commonly used are oxygen and either acetylene, hydrogen, propane, or propylene. This process sometimes includes the use of pressure and a filler material. ![]() This method unites metals by heating - the heat source being a flame produced by the combustion of a fuel gas, such as acetylene, methylacetylene (MAPP gas), or hydrogen. Gas welding, or oxy/fuel welding as it is commonly referred to, is slower and easier to control than arc welding. Cutting processes include oxygen and fuel gas and electrical arc gouging. Unlike welding processes which join two pieces of metal, cutting processes involve separating or severing a piece of metal through intense heat generated to melt the metal. Common welding processes using an electrical arc include Shielded Metal Arc Welding, Gas Metal Arc Welding, and Gas Tungsten Arc Welding. Molten metal is generated through an intense heat source, such as oxygen and fuel gas or an electrical arc. Welding involves joining two or more pieces of metal together to form a single piece. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |