LYCOS RETRIEVER 
Welding: Gas Tungsten Arc Welding
built 622 days ago
During the middle of the century, many new welding methods were invented. 1930 saw the release of stud welding, which soon became popular in shipbuilding and construction. Submerged arc welding was invented the same year, and continues to be popular today. Gas tungsten arc welding, after decades of development, was finally perfected in 1941, and gas metal arc welding followed in 1948, allowing for fast welding of non-ferrous materials but requiring expensive shielding gases. Shielded metal arc welding was developed during the 1950s, using a flux coated consumable electrode, and it quickly became the most popular metal arc welding process. In 1957, the flux-cored arc welding process debuted, in which the self-shielded wire electrode could be used with automatic equipment, resulting in greatly increased welding speeds, and that same year, plasma arc welding was invented.
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You will be introduced to the gas tungsten arc welding process that is most commonly referred to as TIG welding. You will learn how to set up and adjust TIG welding equipment required for welding mild steel and aluminum. The course covers the types of electrodes, shielding gases and electrical current types used in TIG welding. You will develop practical skills in welding mild steel, stainless steel and aluminum in the flat position.
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The type of current used in arc welding ... plays an important role in welding. Consumable electrode processes such as shielded metal arc welding and gas metal arc welding generally use direct current, but the electrode can be charged either positively or negatively. In welding, the positively charged anode will have a greater heat concentration, and as a result, changing the polarity of the electrode has an impact on weld properties. If the electrode is positively charged, the base metal will be hotter, increasing weld penetration and welding speed. Alternatively, a negatively charged electrode results in more shallow welds.[12] Nonconsumable electrode processes, such as gas tungsten arc welding, can use either type of direct current, as well as alternating current. However, with direct current, because the electrode only creates the arc and does not provide filler material, a positively charged electrode causes shallow welds, while a negatively charged electrode makes deeper welds.[13] Alternating current rapidly moves between these two, resulting in medium-penetration welds.
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Gas tungsten arc welding, known as heliarc, is practiced on aluminum and steel. Students practice gas metal arc welding (wire feed welding), and flux cored arc welding on light and heavy metals. One of the most modern techniques, it is being used more and more in manufacturing and the construction industry.
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Gas Tungsten Arc Welding