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This causes the electron flow to switch directions constantly, preventing the tungsten electrode from overheating while maintaining the heat in the base material. When used with alternating current, argon shielding results in high weld quality and good appearance. The ionized shielding gas flows toward the electrode, not the base material, and this can allow oxides to build on the surface of the weld. Russell Meredith of Northrop Aircraft perfected the process in Initially, the electrode overheated quickly and, despite tungsten's high melting temperature , particles of tungsten were transferred to the weld. In fact, no other welding process permits the welding of so many alloys in so many product configurations. GTAW in windy or drafty environments increases the amount of shielding gas necessary to protect the weld, increasing the cost and making the process unpopular outdoors. Retrieved from " https. The preferred polarity of the GTAW system depends largely on the type of metal being welded. Shielding gases with high helium contents are often used for higher penetration in thicker materials.

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Description: Direct current with a negatively charged electrode DCEN allows for high penetration. In addition, if the electrode is not well protected by the gas shield or the operator accidentally allows it to contact the molten metal, it can become dirty or contaminated. Tool steels should also be preheated to prevent cracking in the heat-affected zone. This spark is a conductive path for the welding current through the shielding gas and allows the arc to be initiated while the electrode and the workpiece are separated, typically about 1. To remedy the problem, a square wave power supply can be used, as can high-frequency to encourage arc stability. For GTAW of carbon and stainless steels, the selection of a filler material is important to prevent excessive porosity. Some power supplies enable operators to use an unbalanced alternating current wave by modifying the exact percentage of time that the current spends in each state of polarity, giving them more control over the amount of heat and cleaning action supplied by the power source. Namespaces Article Talk. Common applications include rebuilding seals in jet engines and building up saw blades, milling cutters , drill bits , and mower blades. Additionally, if the welding torch is too far from the workpiece the shielding gas becomes ineffective, causing porosity within the weld. GTAW in windy or drafty environments increases the amount of shielding gas necessary to protect the weld, increasing the cost and making the process unpopular outdoors.
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