Tungsten Carbide and Hard Metal?
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- Category: Tungsten Information
- Published on Wednesday, 16 January 2013 12:00
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Background
Tungsten Carbide is often referred to as a Hard Metal due to it’s very high hardness in relation to other metals.
Typically a Tungsten Carbide Hard Metal can have a hardness value of 1600 HV, whereas mild steel would be in the region of 160 HV a factor of 10 lower.
Although called a hard metal, Tungsten Carbide is actually a composite material with hard particles of Tungsten Carbide embedded in a softer matrix of metallic Cobalt .
What is the Chemical Formula for Tungsten Carbide?
The chemical formula for Tungsten Carbide is WC.
What is the History of Hard Metals or Tungsten Carbide?
Tungsten Carbide was originally developed in Germany in the 1920’s as there was a requirement for die materials that were able to stand up to the high wear encountered in the drawing of tungsten filaments for light bulbs
How is Hard Metal or Tungsten Carbide Made?
Tungsten Carbide Hard Metals are primarily produced using a Powder Metallurgy process, whereby the powdered forms of tungsten carbide and cobalt are mixed using ball mills, a binder material is added to hold the powders together during the next stage of the process which is compaction or pressing.
During the compaction processes, hydraulic presses or isostatic presses are used to compact the powders into a shape which approximates the design of the finished product.
Whilst in this condition, the powder compact can be easily machined using conventional metal working tools. This process is often referred to as “Green Machining”. Care has to be taken with the removal of the fine powder particles as they can pose a health hazard so effective extraction methods are required.
Following “Green Machining” the powder compact is then ready to be Sintered. Typically this is done in a vacuum furnace at temperatures between 1300 and 1600°C.
The sintering process causes the tungsten carbide and cobalt matrix to fuse together to produce a dense “Hard Metal”.
After sintering the material is so hard that it can only be machined by diamond grinding, a specialised form of micro machining that is relatively expensive as it is not possible to remove large amounts of materials by this process.
Applications of Tungsten Carbide and Hard Metals
Tungsten Carbides have a wide range of application in many industry sectors such as metal machining, wear parts for mining and oil industries, metal forming tools, cutting tips for saw blades and have now expanded to include consumer items such as wedding rings, plus the ball that is in many ball point pens.
Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Larson Jewelers Introduces Artcarved Rings Line
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- Category: Tungsten Information
- Published on Wednesday, 16 January 2013 11:30
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Larson Jewelers is proud to announce they are now an authorized dealer of the ArtCarved line of bridal jewelry and wedding bands, a division of Frederick Goldman, Inc. ArtCarved is one of the oldest designers of wedding bands in the US. Since 1850, they have been designing and manufacturing beautifully crafted wedding bands.
Artcarved Rings is one of those classic American companies that have been around for over 150 years because of their dedication to good old fashioned values of hard work and innovation. In fact, they were the first jewelry designer to start making wedding bands that were seamless, meaning you could not see where the two ends of a ring were joined together. This means not only is the ring more aesthetically pleasing to look at, it is also much more comfortable to wear. They also helped make it popular for both men and women to wear a wedding band. Before World War II, wedding bands were primarily worn by the bride only.
Artcarved has a long reputation for quality, and today their rings can be found all over the country in the largest chain jewelers. They are very selective about which jewelers they work with. They put principles before profits. This can be seen by the fact that they recently reduced the number of authorized dealers. Most designers would love to have their products in as many showrooms as possible, not ArtCarved. They want to make sure they have the best retailers representing their products, not the most retailers carrying their products.
Their rings also comes with a manufacturer’s lifetime warranty that covers size exchanges for life, as well as replacement in case of accidental damage, for a nominal fee. For a limited time, use coupon code WINTER15 to get an extra 15% off all ArtCarved branded rings at Larson Jewelers.
About LarsonJewelers
LarsonJewelers provides the largest selection of tungsten rings in the world. They also have large selections of palladium rings, ceramic rings, and cobalt chrome rings.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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XL Video Supplies Mumford & Sons Tour
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- Category: Tungsten Information
- Published on Wednesday, 16 January 2013 10:00
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UK - The latest UK arena leg of the successful Mumford & Sons Tour of Two Halves world tour featured 2,547 of XL Video's latest FX-200 product, together with three Pixled F11 LED screens, HD cameras / PPU and crew.
The versatile FX-200s were specified by lighting and visuals designer Ed Warren from Next Level Lights.
The small opaque plastic balls encase LED clusters and can be fitted together and configured to suit any design.
The band have been touring for the last three years with various different arrangements of tungsten lightsources over and around the stage as an integral part of the lighting rig.
Earlier in this tour, Warren introduced LED festoon lighting, going from the stage and reaching right out into the audience ... and he wanted to take this up another level and add another dynamic and adaptable lightsource to the mix - enter the FX-200.
He had seen the product in action at various festivals over the summer and thought it ideal for the next evolution of his design. "I wanted something far more than just a standard light bulb or lightsource, and something that could produce high-impact low-res effects like the stars at night or burning embers."
Apart from that, he needed to be able to get a good tungsten to match and complement the rest of the lighting aesthetics.
The FX-200s were mounted on small different length steels and hung on two independent trusses. Their layout and where they were positioned onstage was critical to the rest of the lighting rig, and when in position they brought two distinctive additional curved visual layers to the stage.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Weaving Showcases Sabre Tine Drill
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- Category: Tungsten Information
- Published on Wednesday, 16 January 2013 11:10
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Plenty of fields across the UK are still saturated, so lots of farmers are choosing tine drills as the best way to get seed into the ground. Weaving Machinery’s interestingly-named Sabre Tine Drill should appeal to those struggling with the ground conditions.
The angle of the three rows of tines is adjustable, as is the position of the seed pipes. But the main feature of the new drill is the new tungsten-pointed tine, which is narrow to minimise soil disturbance. Two rows of levelling tines should tidy up any loose soil at the back.
The same 1.5t hopper is shared with the firm’s standard tine drill and an RDS auto-calibrating metering system allows seed rates to be changed on the move.
Weaving reckons the main appeal of the Sabre drill is the low horsepower requirement. It can be used either on ploughed ground on directly into stubble, with working widths extending from a 3m rigid version up to the widest 8m variant.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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Tungsten Inert Gas Welding Techniques
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- Category: Tungsten Information
- Published on Tuesday, 15 January 2013 18:25
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Tungsten inert gas (TIG) welding is an arc welding process that uses a tungsten electrode within the welding gun. The difference between metal inert gas (MIG) welding and TIG welding is that the electrode does not contribute material to the weld. A separate welding rod is used to add material to the weld if it is needed. Argon is generally used as a shielding gas for TIG welding operations. TIG welding is most often used to weld stainless steel, aluminum, and other non-ferrous metals.
Basic TIG Welding Technique
To create a TIG weld, the welder holds the electrode at a 10 degree angle from vertical, with the electrode pointed in the direction of the weld. This is called the "push" method, and the process "pushes" the metal along the weld. This position also maintains optimal coverage of the shielding gas, resulting in a clean, consistent weld. The welder must maintain a short distance between the electrode and the work piece while preventing physical contact. TIG welding is considered more difficult than MIG welding or gas welding processes. The welder moves the electrode around in a small circle until a pool of metal is formed, and then he begins a cyclic process of moving the electrode forward and adding filler material as needed. The process continues until the end of the weld is reached, and the welder pulls the electrode away from the work piece, allowing it to cool.
Hot Wire Technique
The hot wire technique includes pre-heating the filler wire to increase the rate of melt of the filler material, resulting in more material being deposited into the weld. The energy from the arc is used solely to heat the work piece, rather than requiring a diversion of some of the energy to melt the filler wire. This method is used for thick welds where a significant amount of filler material is added.
Pulsed Current Technique
Pulsed current TIG welding is used on thin pieces such as sheet metal where excess heat can cause burn through or warping. The power supply cycles through two levels of voltage. The higher level of voltage causes the material to melt, and is then allowed to cool during the period of lower voltage. This process can be automatically programmed for specific weld rates to maintain lower heat levels in the work piece.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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