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Official guidelines When Using Thoriated Tungsten Electrodes

Details: Category: Tungsten Information; Published on Tuesday, 07 May 2013 11:14; Hits: 2347

The International Institute of Welding Health and Safety Commission VIII states that there are no specific hazards regarding storage, handling or welding but dust extraction equipment should be used on the grindstone and respiratory protection should be worn by the operator during grinding. This is covered by the Health and Safety Executive Guidance note HS(6) 53 The selection, use and maintenance of respiratory protective equipment.

In the UK the use of thoriated tungsten electrodes is subject to the Ionising Radiations Regulations 1999. Exposure must be kept as low as is reasonably practicable, and the guidelines in the previous sections are designed to achieve this.

Local rules and adequate supervision are required. The employer must appoint a Radiation Protection Supervisor (RPS), who should be responsible for

Firs,the implementation and monitoring of all health and safety procedures for the storage, grinding, use and disposal of thoriated tungsten electrodes and all by-products.
Second, keeping records of the amount of thoriated tungsten in store, and the numbers of electrodes issued to each welder.
Third, giving instruction in the correct use and grinding procedures to the welders. These procedures should be in the form of written instructions, in addition to verbal presentations. The welders must know the name to the RPS.
Fourth, monitoring to check that the welders are carrying out the grinding procedures correctly, and that the dust extraction system is working effectively.

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Applications of Tungsten Alloy in Aircraft

Details: Category: Tungsten Information; Published on Tuesday, 07 May 2013 10:54; Hits: 2314

Probably the most well known application for tungsten alloy is the aerospace industry, where weights and counterweights are often required to be housed in restricted areas. With significant reductions in size possible, this in turn, leads to greater control of weight distribution. These components can increase the sensitivity of control mechanisms and keep the forces required to operate flight controls within acceptable limits.

Vibrations in the dynamic components of aircraft engines and propeller systems are highly undesirable. Vibration, caused by mass imbalance of externally rotating components, can be reduced or eliminated by using mass trim weights. Additionally, counterweights are incorporated into the pitch control systems of many propeller designs as a failsafe mechanism. During flight the propellers are kept at the correct angle by hydraulic pressure counterbalances to optimize performance. Tungsten alloy offer designers several advantages over conventional balance materials such as lead or steel. The higher density of the alloys permits smaller components to be used, reducing overall system weight. Unlike lead, which can exhibit creep at ambient temperatures, these alloys are stable and so may be used in mechanically stressed positions without the need for additional fabrication and encasement.

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Tungsten Carbide Reciprocating Saw Blades

Details: Category: Tungsten Information; Published on Tuesday, 07 May 2013 10:51; Hits: 2404

Tungsten carbide coats the edges of blades for reciprocating saws, such as jigsaws and demolition reciprocal saws.

The back-and-forth sawing motion of these types of saws is well-suited for abrasion, and their coating of tungsten carbide grit allows them to grind through metals, ceramics and masonry.

Applications include removing cast iron pipes and metal fasteners during demolition or cutting access holes through stone and tile during remodeling.

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Grinding When You Use Thoriated Tungsten Electrodes

Details: Category: Tungsten Information; Published on Tuesday, 07 May 2013 10:53; Hits: 2467

Grinding creates the greatest hazard as the exposed tungsten/thoria area is greatly increased and fine particles of potentially radioactive dust are released into the atmosphere.

It is recommended that a dedicated grindstone with local dust extraction is used, and a simple filter mask is worn unless the number of electrodes used is very small (less than about 20 per year). If the grinding wheel is not fitted with a protective viewing screen, eye protection should be worn. The air extract from the grindstone should be arranged so that the particles are deposited into a substantial disposable bag.

A safe method of collecting and handling the dust from the collection unit must be used to minimise release to the atmosphere (for example, it could be placed in a sealed paper/plastic bag.)

The area round the grinding wheels should be cleaned daily with a vacuum cleaner to remove dust particles. If a high efficiency vacuum cleaner is not available, then the material should be damped down to minimise dust.

Workers should be encouraged to wash their hands before using the toilet facilities, and before taking work breaks, and for this reason the washing facilities should be close to the work areas.

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Drill Bit Tools

Details: Category: Tungsten Information; Published on Tuesday, 07 May 2013 10:29; Hits: 2308

Drill bits is a kind of solid tungsten carbide or tipped with it to provide the speed, accuracy and wear resistance required by machine shops and high-precision manufacturing applications.

Construction professionals and amateurs buy similar bits that attach to hand power drills, drill presses and hobbyist rotary tools. Precision drill bit and grinding tools with tungsten carbide tips might be used for milling or sculpting metal as well as decorative carving of stone and precious gemstones.

As materials scientist Dale Wittmer stated in a Southern Illinois University publication, "Tungsten carbide tools have been the standard for over 50 years in the mining industry."

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