Tungsten Electrode 2% Thoriated Red 3/32"x7": You are on the page for 10 pcs of Tungsten Electrodes WT20 3/32" x 7" 2.0% Thoriated, which are Tungsten Electrodes painted in RED for Tig welding. America Alloy(AA) 10pcs GTAW / TIG Welding Tungsten Electrodes 2% Thoriated EWTh-2 / WT20 Tungsten Electrode(red) 3/32" X 7" / 2.4 X 175mm America Alloy(AA) 10pcs GTAW / TIG Welding Tungsten Electrodes 2% Thoriated EWTh-2 / WT20 Tungsten Electrode(red) 3/32" X 7" / 2.4 X 175mm A ten (10pcs) pack of premium AWS EWTh-2(or ISO WT20) 2% thoriated tungsten electrodes with size in 3/32" X 7" / 2.4 X 175mm in ground finish Outstanding resistance from weld pool contamination, stable ARC and easy starting capabilities Generally used for Direct Current(DC) straight polarity (Electrode Negative) applications Conforms to American Welding Society standard A5.12M/A5.12:2009,ISO6848 and EN26848 Introduction Name Tungsten Symbol W Atomic Number 74 Atomic Weight 183.84 Density 19.25 g/cm3 Melting Point 3422 °C, /6,192 °F Boiling Point 5555 °C Tungsten is an ideal material for Plasma Arc Welding (PAW) and Tungsten Inert Gas / Gas Tungsten Arc Welding (TIG / GTAW) welding electrodes. Tungsten or wolfram (hence the chemical symbol W) is a very dense gray metal. In fact, its name comes from the term “heavy rock” in Nordic languages. It has several physical characteristics that make it very desirable in industrial applications. Tungsten has the highest melting point (3,422 °C, 6,192 °F) of any pure metal and has the second highest melting point of all elements. It also has the highest tensile strength and lowest thermal expansion of any pure metal. Tungsten is also a good electrical conductor. Tungsten electrodes come in clean or ground finishes. Great for heat conduction, ground electrodes have a polished surface and are ground to a uniform size. Electrodes are available from 3” to 24” in length with diameters running from .02” to .25”. Choosing Tungsten Electrodes When choosing a tungsten electrode’s composition, diameter, and tip shape, you should consider: • The amperage range needed • The shape and thickness of the welded metal • The type of welded metal • The type of welding power source including wave type and output frequencies • Whether you plan to use AC or DC current Tungsten Electrodes Alloys Advantages While pure tungsten is a good material for electrodes, tungsten rare-earth alloys perform even better. Benefits include: • Better current capacity, including low-current performance • Improved point maintenance rather than balling, producing a narrower arc cone with less wandering • Longer service life Classifications Both the International Organization for Standardization (ISO) and the American Welding Society (AWS) have standardized tungsten electrodes in ISO 6848 and AWS A5.12 respectively. The electrodes are classified and color coded by the type and quantity of alloying elements added to the tungsten (see table). The color appears as a dab of paint on the end of the electrode. The most common types in the U.S. are: • 1.5% lanthanated tungsten • 2% ceriated tungsten • 2% thoriated tungsten • Pure tungsten • Rare-earth hybrid tungsten No matter what alloy you choose, the most important factor is electrode quality. Quality manufacturers test their electrodes for chemical content, density, grain size, length, diameter, straightness, and roughness. Types of Tungsten Electrodes WY(Blue) Yttrium-Oxide Tungsten Electrodes Electrodes with yttrium oxide added (WY) provide similar benefits to cerium oxide. 2% yttrium-oxide tungsten electrodes are color coded blue (ISO only). Yttrium is sometimes used in proprietary “rare earth” blends. WZ(White) Zirconium-Oxide Tungsten Electrodes Electrodes with zirconium oxide (zirconia) added (WZ or EWZr) improve arc stability, starting, and current capacity. They are a top choice for AC welding because they combine the stable arc and balled end typical of pure tungsten with the current capacity and starting characteristics of thoriated tungsten. These electrodes are used radiographic-quality applications with minimum tungsten contamination. .3% zirconiumoxide tungsten electrodes are color coded brown (ASW and ISO), and .8% is color coded white (ISO only). WP (GREEN) - Pure Tungsten Electrodes Electrodes made with pure tungsten (WP or EWP) are general purpose budget models (the WP stands for wolfram pure and the E stands for electrode). Pure tungsten is harder to start and maintain a stable arc.It also suffers from high burn-off resulting in a shortened service life. Pure tungsten electrodes are color coded green (both ASW and ISO). These electrodes form a balled tip when heated and have good arc stability for AC balanced-wave welding. WC (GREY) - Cerium-Oxide Tungsten Electrodes Cerium oxide (or ceria) as an alloying element improves arc stability and ease of starting while decreasing burn-off. Electrodes with cerium oxide (ceria) added (WC or EWCe) offer improved arc stability and starting while reducing burn off when compared to pure tungsten electrodes. A 2% cerium oxide alloy is considered a universal moderate-current tungsten electrode. Cerium Oxide Tungsten electrodes are especially good for low-amperage applications, DC orbital tube, pipe, thin sheets, and small parts. WL (2.0% SKY-BLUE, 1.5% GOLD, 1% BLACK) - Lanthanum-Oxide Tungsten Electrodes Electrodes with lanthanum oxide (lanthana) added (WL or EWLa) provide similar benefits to cerium oxide, namely improved arc stability and starting while reducing burn off when compared to pure tungsten electrodes. Lanthanated tungsten electrodes with a pointed end work well for DC negative electrode and AC square-wave power sources. Electrodes with ball-shaped ends work well with AC sine wave power sources. 1% lanthanum-oxide tungsten electrodes are color coded black (ASW and ISO), and 1.5% are color coded gold (ASW and ISO). WT ( 2.0% RED, 1% Yellow, 3% Violet, 4% Orange) - Thorium oxide (or thorax) alloy electrodes Thorium oxide (or thorax) alloy electrodes offer excellent arc performance and starting, making them popular general purpose electrodes. However, it is somewhat radioactive, making inhalation of thorium vapors and dust a health risk, and disposal an environmental risk. EWG(AWS classification EWG, Grey) Rare-Earth Hybrid Tungsten Electrodes Rare earth hybrid tungsten electrode contains unspecified additives of rare-earth oxides or hybrid combinations of different oxides, but manufacturers are required to identify each additive and its percentage on the package. Depending on the additives, desired results can include a stable arc in both AC and DC processes, greater longevity than thoriated tungsten, the ability to use a smaller-diameter electrode for the same job, use of a higher current for a similar-sized electrode, and less tungsten spitting. WC Cerium-Oxide Tungsten Electrodes Electrodes with cerium oxide (ceria) added (WC or EWCe) offer improved arc stability and starting while reducing burn off when compared to pure tungsten electrodes. A 2% cerium oxide alloy is considered a universal moderate-current tungsten electrode. Cerium Oxide Tungsten electrodes are especially good for low-amperage applications, DC orbital tube, pipe, thin sheets, and small parts. Like thoriated tungsten, these electrodes are good for DC welding on carbon steel, stainless steel, nickel, and titanium. In fact, welders often have difficulty discerning any performance difference between ceriated and thoriated tungsten electrodes. Unlike thoriated ones, ceriated tungsten electrodes are not recommended for higher amperages because the oxide will migrate to the tip of the electrode causing arc quality issues. 2% cerium-oxide tungsten electrodes are color coded orange (ASW) or gray (ISO). Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eBay Marketing, eBay listing Apps, eBay Apps, eBay Application Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eBay Marketing, eBay listing Apps, eBay Apps, eBay Application
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