Tungsten jigs. Part 2

Powder metallurgy method

Recently, stores have filled tungsten jigs obtained by pressing. This tungsten jig is made using powder metallurgy technologies. Tungsten powder with a certain number (1.5-3%) of additives is compressed with a force of 5-10 tons per cm and sintered at a temperature close to the melting point of tungsten; in this technology, an obvious advantage is the ability to produce large batches of identical jigs with minimal losses of the original tungsten powder. In the process of sintering (high-temperature heating), the jig shrinks. If, say, the workpiece of the jig was 6 mm in diameter, after sintering it acquires a diameter of 5 mm, while maintaining the original weight.

However, what was said above about powder metallurgy is, so to speak, an ideal option. That is, if the impurities in the tungsten powder are really about 3%, then the specific gravity of the finished product will approach 18-19 g / cm. In fact, manufacturers often try to simplify their lives and add much more low-melting light impurities to tungsten powder than they should, as a result of which the density of the material is significantly reduced. Pure tungsten is difficult to process on turning, drilling and milling machines, it is not soldered without electroplating and other coatings, although it is relatively easy to grind, therefore, jigs made of tungsten-containing alloys, which can already be easily processed, brazed, and drilled, often appear under the “tungsten” brand. Most often it is VZhN (tungsten-nickel-iron). But their specific gravity is already much less than that of tungsten, that is, they do not perform the function of replacing lead with tungsten. The minimum concentration of metals, leading to the possibility of soldering, reduces the density of the alloy to at least 16.8 g / cm.

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But even VZHN is not the worst. Various binding additives are used to give the alloy a certain shape; not only lead, copper, nickel, iron, but also light non-metallic additives. Pressed retail tungsten jigs are often made using glass, glue, or the like as a binder. Since they are very fragile, they are coated with a molten tin or a lot of substance to impart mechanical strength. The density of such jigs is 14 g / cm, which is not much higher than the density of lead analogues. In a “tungsten-glass” type construction, the use of glass with a specific gravity of 2.5 g / cm3 can lead to an average density of the jig even lower than that of lead. Such jigs can be called tungsten only with a very big stretch.

Trust but verify

But how can you be sure that tungsten is worth the money? Tossing in the palm of your hand won’t give a real picture. The most meticulous ones can remember physics and quite accurately calculate the density of the jig. Determine the weight of the bait on a pharmaceutical scale. Then we put the same scales in the bath and determine the weight of the jig in the water. At the same time, weights should not be in the water. We calculate the difference in weight. Now it remains to divide the weight of the jig in air by the difference. The resulting number is the density of a particular jig in g / cm. And if it is closer to the density of lead than to tungsten, it means that we paid the money for the jig in vain.

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You can carry out a “chemical analysis” by comparison. Let’s say we have a tungsten “drop”.
We put it on the pharmaceutical scales. Now we need to balance the scales with pure lead. Let’s take a pig jig with a similar shape to a tungsten jig, but the size, of course, is large. When the scales are balanced, you can use a measuring tool for comparison, or just your eye, if it picks up a difference of a tenth of a millimeter well. Put two jigs on the palm and carefully compare their sizes. Tungsten should be one and a half times less than lead. But if our eye does not catch a special difference in size, then the fish does not see this difference. That is, we were cheated in the store: either it is not pure tungsten, or the rules of fair manufacturing indicated above were violated.

Fishing experience

Fishermen, picking up jigs in shape, most often stop at pellets, droplets, “Ural”, ants, “devils”, oatmeal, plates. But the latter may fail: their “yaw” sometimes significantly increases the number of bites, and sometimes acts negatively. Athletes usually prefer jigs that look like droplets, oatmeal or pellets. In competitive practice, the use of multi-hook tackle is prohibited, but in amateur fishing, a devil jig, especially black or red, sometimes helps out great.

Of course, tungsten jigs help out a lot in the wilderness, on the last ice, when you have to run after active fish. Help out especially those who do not like to catch with double-muscular rigs. However, tungsten also has its drawbacks. For example, it is difficult for them to diversify the game of the jig. It is because of its large weight that tungsten plays only in the vertical plane. There are practically no horizontal movements of the jig. Tungsten has another drawback: it is precisely because of its high density that the fish quickly feels the unnaturally large weight of the jig, leaving the fisherman less time for a successful hooking. First of all, this concerns bream, for which even athletes make an exception, using lead “uralki”, “drops” and “ants”.

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In most cases, bream pays little attention to the size of the jig, focusing only on the nozzle. If you take tungsten and the same tin jig, the latter will be two and a half times larger. However, sucking tin with its mouth-vacuum cleaner, bream will recognize it later than tungsten, and there will be fewer empty bites. Therefore, when fishing with tungsten, the main thing is not to yawn with a hook.

About color. In cloudy weather and at a depth of more than 3-4 m or in muddy water, it is better to use white or shiny jigs. At shallow depths and on a clear day, red-copper and gray jigs work better. Green and gilded jigs have proven themselves quite well at medium depth. Although, nevertheless, the color, however, as well as the shape, should be selected in specific conditions, based on the experience, habits and preferences of the fish that is found in the selected reservoir.