Tungsten Powder Price

Tungsten Worm Weights 1

Details: Category: Tungsten Information; Published on Wednesday, 24 September 2014 08:58; Written by Sherry; Hits: 498

Tungsten worm weights, also called tungsten barrel weights in some countries, are known as "Diamond Series" because of they are drilled, beveled and diamond polished to avoid damaging the line.

Tungsten worm weights are feature for cone or bullet shape, which designed to easily slip through weeds and appreciated by bass anglers. The weights have a hole through their center to hold the fishing line. Rigged directly in front of soft-plastic baits such as worms or craws, worm weights can be fixed in place or allowed to slide along the line.

Tungsten worm weights are equipped with nylon inserts to keep your line in top working order and not nicked by the weight edge as is common with other weights.

tungsten-Worm-weights

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Tungsten Rods for Electrode

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 15:31; Written by jwy; Hits: 494

Tungsten rod for electrode shared the same properties of tungsten, tungsten rod is frequently used as electrodes in high-energy electrical equipment (such as targets in X-ray tubes and spark gaps in Tesla Coils) where other metals would vaporize or melt. The thin filaments in light bulbs are made of fine Tungsten wire. Our solid Tungsten rod are 1/8" in diameter, and 3" to 3.5" long.

Selecting the right tungsten is crucial to a successful TIG weld. You have to insure the correct tungsten is used for the type of metal you are welding, the type of technology used in your welder such as transformer or inverter, and the thickness of the metal you will need to weld. This leaves you with a variety sizes ranging from 1/16 to 1/8” and the types of tungsten’s such as the Pure Tungsten (TP), 2% Thoriated Tungsten (TT2), 2% Ceriated Tungsten (TC2), and 2% Lanthanated Tungsten (TL2). Fortunately, LONGEVITY offers high quality tungsten electrodes and explains which tungsten is required for the right application. Pure Tungsten (TP) – (green tipped) - Pure tungsten readily forms a ball on the end. It is designed for use with transformer-based power sources for AC welding of aluminum. Unfortunately, LONGEVITY does not carry transformer based technology considering the size and weight of TRANSFORMER welders. Therefore, this tungsten is rarely sold buy our sales staff.

Tungsten inert gas (TIG) welding, also known as gas tungsten arc welding (GTAW), is an arc welding process that uses a tungsten electrode to transmit the electric arc to the work piece. Unlike other arc welding methods, the tungsten electrode does not provide material to the weld, so a separate filler rod is needed for that purpose. Some tungsten electrodes are made with a small amount of thorium, which is a radioactive material and improves the welding qualities of the electrode.

Welding with tungsten: Tungsten has the highest melting point of all metals, so the electrode material does not melt when exposed to the high temperatures of the arc. Tungsten can be used to weld metals and specific alloys designed to have a high melting point. Even though the tungsten electrode doesn't melt during the welding process, the electrode can wear or chip over time. The electrode can be reshaped to a conical or rounded shape using a grinder.

Electrodes that contain thorium: Thoriated tungsten electrodes are made from tungsten combined with 1 to 2 percent thorium in the form of thorium dioxide. Thoriated tungsten electrodes result in improved welding properties over pure tungsten electrodes. By using thoriated tungsten electrodes, welders find it easier to start the arc and maintain the arc, reduce weld contamination, carry a higher level of current, and achieve a longer electrode life through reduction in wear.

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Grain Growth in Tungsten Rod

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 15:03; Written by jwy; Hits: 528

Samples were deformed at elevated temperatures in compression and then annealed. The microstructure was examined by optical metallography, scanning electron microscopy, and electron backscattering diffraction patterns (EBSP) in the scanning electron microscope. The results showed that when the samples were deformed at a high crosshead speed at 1200, 1400, and 1600°C, the microstructure consisted of grains that had developed a high aspect ratio in the regions of the sample that had received the most deformation. When these samples were annealed, a more equiaxed structure was produced. Samples deformed at 1800°C developed very fine recrystallized grains during the mechanical testing. These remained during the anneal. When the crosshead speed was reduced, these fine grains could be observed even after testing at 1200°C. EBSP revealed little, if any, crystallographic texture in the recrystallized grain structure. These results are compared with previous work on tungsten rod to develop a more complete description of this process.

For many years there has been a great interest in understanding grain growth in aliminum-potassium-silicon (AKS) doped tungsten because of its importance in the lighting industry. The non-sag struture of long-life lamp filament is produced by s process secondary recrystallization (abnormal grain growth) in which the final grain shape is controlled by the rows of potassium bubbles present in the material. Also, during the processing of tungsten to make wire, it is often necessory to anneal. Grain growth in these rods occurs by a process in which a few grains grow and consume all others. The mechanism could be described as secondary recrystallization, but it has been suggested that the process is better described as strain annealing, since the few grains that grow nucleate in a matrix that is polygonized and thus is similar to the lightly deformed matrix in which the large grains grow during strain annealing.

One question that has not been addressed in whether or not there is a crystallographic component to this process. That is, do the few grains that grow in the rod and consume the others have a particular orientation relative to the sample orientation or the way that it was deformed. In this paper, we investigate this process through the use of backscattered Kikuchi patterns formed in the scanning electron microscope. Our results will show that there may be a slight crystallographic preference in the grains which initially begin to grow, but that when grain growth is complete the orientation of the grains is random. We also show that strain rate slow enough, small grains can form by dynamic recrystallization during deformation. Finally, we suggest that the formation of the new grains is controlled by the number of nucleation sites in the material and in some cases the resulting grain size may be smaller than the original grain size ans in other cases larger, Thus, trying to classify the process as recrystallization, grain growth, abnormal grain growth, or strain annealing may not be important; rather having a good understanding of the factors that control grain growth is what will allow engineers to develop material with the desired properties.

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High Purity Tungsten Rod Introduction

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 15:17; Written by jwy; Hits: 500

High purity tungsten rod can be used as heat conductor, additive, crankshaft and cylinder barrel of automobile, parts of heat-resistant steel and electrode. High purity tungsten rods are mainly used in guns, rockets, satellites, airplanes and ships.

Chemical components for different purity Tungsten Rods:

W (>%)	Chemical Content (<%)
99.999	Fe	Ca	Be	Sn	Al	Ni	Zn	Sb	Pt	K	Ta	Na
	0.1	0.05	0.005	0.005	0.05	0.01	0.05	0.05	0.03	0.005	0.1	0.05
	Cr	Pb	As	Mg	Ti	Bi	Mo	Cd	Cu	Ba	Co	Mn
	0.005	0.01	0.05	0.05	0.005	0.01	0.01	0.005	0.007	0.01	0.005	0.005
99.99	Fe	Ca	Be	Sn	Al	Ni	Zn	Sb	Pt	K	O	Na
	0.1	0.45	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.5	4	0.9
	Cr	Pb	As	Mg	Ti	Bi	Mo	Cd	Cu	Ba	Co	Mn
	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.1	0.1	0.1	0.1	0.1
99.95	Fe	Ca	P	Sn	Al	Ni	N	Sb	Si	O	Pb	As
	5	3	1	0.1	2	3	3	1	3	3	0.1	2
	Mg	C	Bi	Mo
	2	5	0.1	1

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Microstructure of Rolled and Annealed Tungsten Rod

Details: Category: Tungsten Information; Published on Tuesday, 23 September 2014 14:53; Written by jwy; Hits: 494

The effect of annealing on the microstructure of the rolled material is also considered. All samples were rolled on a Kocks mill. At low levels of deformation, the grain boundaries are primarily high-angle boundaries, and many grains are dislocation free. Both of these features probably result from dynamic recrystallization during rolling.

As deformation increases, the grains become more elongated, and more low-angle boundaries are found within the material. Also, the potassium gets drawn into narrower and longer tubes. When these rolled rods are annealed at temperatures between 1275 ‡C and 1950 ‡C, several changes occur in the microstructure. The material undergoes abnormal grain growth. The temperature at which this occurs depends on the length of the anneal, the amount of de-formation the rod has received, and the spatial location in the tungsten rod.

This spatial distribution most likely results from strain gradients that exist in the rolled tungsten rod. The abnormal grain growth is accompanied by a decrease in hardness. The potassium-containing tubes in the rod also break up into bubbles during annealing. The temperature at which this breakup occurs again depends on the length of the anneal and the amount of deformation.

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