Tungsten carbide cutting tools include twist drills, reamers, boring tools, milling inserts, ball mill, blade cutter, taper cutter, smooth plug rod and step drill.

Tungsten carbide can be used as a wide variety of cutting tools. cutting tool Carbide The amount of tungsten carbide tool occupies about one-third of the entire tungsten carbide production.


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The material of manufacturing the tool must have high temperature hardness and wear resistance, the necessary bending strength, impact toughness and chemical inertness, for good process, usually when the hardness is high, wear resistance is also high; high bending strength is with impact toughness. However, the higher the hardness is, the lower the flexural strength and impact toughness are. Tungsten carbide is a widely used tool material. Tungsten carbide indexable inserts are now coated with titanium carbide by chemical vapor deposition of titanium nitride, alumina hard layer or composite hard layer. Developing physical vapor deposition method can be used for carbide tool.


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Tungsten carbide rod is tungsten carbide cutting tools, which applies different coarse grinding parameters, cutting materials and non-metallic materials. Meanwhile, the tungsten carbide rod can also be applied to a conventional automatic, semi-automatic lathe, and so on. The main process is milling → formula according to the intended use →wet milling →mixing →smashing →drying → sifting → crush → drying → mixed sieved and then drying → mix → granulation suppress → forming → low pressure burning → forming → ??cylindrical grinding fine grinding → packaging →detection size →putting in storage.


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standard rods overview
solid rods
1 central coolant duct - broken link
2 straight coolant ducts
2 coolant ducts 30° helix
2 coolant ducts 40° helix
3 coolant ducts 30° helix
3 coolant ducts 40° helix
micro twisted coolant ducts 

Special Rods

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Welding procedure variables control the welding process and the quality of the welds produced. Joint configuration is determined by the design of the weldment, the metallurgical analysis, and by the process and procedure required by the weldment.

Welding variables are selected after the base metal, filler metal, and joint configuration have been selected. The fixed welding variables include the type of filler metal, electrode type and size, the type of current, and the type of shielding gas.

The adjustable variables control the shape of the weld by affecting things such as bead height, bead width, penetration, and weld integrity. The primary adjustable variables for GTAW are welding current, arc length, and travel speed.

Secondary variables also aid in controlling the welding process, but it is more difficult to calculate the extent of effect. The secondary variables include work and travel angle and the distance the electrode extends beyond the end of the cup.

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Dabbing

The dabber variation is used to precisely place weld metal on thin edges. The automatic process replicates the motions of manual welding by feeding a cold filler wire into the weld area and dabbing (or oscillating) it into the welding arc. It can be used in conjunction with pulsed current, and is used to weld a variety of alloys, including titanium, nickel, and tool steels. Common applications include rebuilding seals in jet engines and building up saw blades, milling cutters, drill bits, and mower blades.

Working the puddle

Another method of adding filler rod is instead of dabbing, to rest the filler rod next to the puddle, and melt it down with the TIG torch. This method is typically high deposition and in some cases, can have an advantage over dabbing. One case where it is superior over dabbing is on thin metal. You can move faster by working the puddle therefore it helps with burn through.

Vacuum welding

For industrial applications, superior results can be achieved by eliminating the effects of absorbed gasses at the weld. This can lead to reduced oxidation, reduced workpiece heat carried by convection and stronger materials due to dissolved or reacted gases such as oxygen, nitrogen and hydrogen.

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Joining tungsten to itself or to other metals should be undertaken with caution and an understanding of the limitations involved. Tungsten can be welded to itself. However, the resulting weldment is always recrystallized and hence brittle. Even the use of a W/Re filler rod does not eliminate the brittleness of the metal adjacent to the heat-affected zone. On the other hand, if a leak-tight high temperature joint is required, welding is the only solution.

For joints that do not have to be leak-tight but require good high temperature mechanical strength, the use of either tungsten or tantalum rivets has proven quite satisfactory. Tantalum rivets, while not as strong as tungsten rivets, are much easier to head. Tungsten rivets take more skill to head, but are the most satisfactory.

If tungsten parts which are not to be exposed to very high temperatures are to be joined, brazing is preferred to welding. As long as the braze material has a melting point below the recrystallization temperature of tungsten (under 2200 °F), embrittlement can be avoided. Copper or silver alloys containing small proportions of nickel or iron are suitable for these applications.

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Tungsten can be machined by turning, milling, or drilling. For thick-walled parts, slight preheating of the work to 400 °F is sometimes helpful; otherwise highly chlorinated oil such as trichloroethylene is used. Using a C-2 Type Carbide Tool, a suggested Geometry is:

• Side Angel: 10°
• End Cutting Edge Angle: 3° to 10°
• Back Rake: 0°
• Clearance: 3° to 5°
• Nose Radius: 1/32" to 1/16" Radius
• Cutting Speed: 100 to 200 RPM

The final shaping of tungsten parts is frequently done by grinding. Silicon carbide wheels with a hardness of J to L and a grain size of 100 to 120 have proven useful for most applications. Since tungsten is hard and brittle, surface checking can be a problem unless adequate cooling is used. An oil emulsion type coolant is recommended.

Inverters Add Key Benefits:

A quick review is in order. About 30 years ago, Miller Electric invented and patented the squarewave AC output and adjustable balance control function found in its line of Syncrowave® TIG welders. This technology made the transition through the zero amperage range faster than a regular sine wave, which improved arc starts and created a more stable arc. With balance control, the operator could change the duration of the AC half cycle, adjusting the electrode negative (EN) from 32 up to 68 percent.

Today, the next generation of this technology - AC TIG inverter - features three advanced squarewave technology capabilities.

First: The AC TIG inverter produces incredibly smooth, stable arcs because the squarewave is driven through the zero point thousands of times faster than a rectifier-based welder. Miller's Dynasty® inverters are so fast that its built-in, high frequency capabilities are used for arc starting only. They also offer Lift-Arc™ starting capabilities to eliminate the use of high frequency completely, even on AC.

Second: Inverter-based welders extend EN balance control. The Dynasty lets operators fine-tune duration times from 50 percent to 90 percent. Making the EN portion of cycle last longer achieves greater penetration; narrows the weld bead; increases travel speeds up to 20 percent; may permit using a smaller diameter tungsten to more precisely direct the heat or make a narrower weld bead; and, reduces the size of the etched zone for improved cosmetics.

Third: Inverter-based welders let operators adjust the welding output frequency, from 20 to 250 Hz in the case of the Dynasty. Conventional welders have a fixed output of 60 Hz. Lowering the frequency produces a broader arc cone, widening the weld bead profile, which is great for build-up work. Increasing frequency above 60 Hz produces a tight, focused arc cone. This pinpoint heat control drives more heat into the weldment for better penetration and a narrower weld bead, which helps when welding in corners, on root passes and fillet welds or anywhere precision welding is required.

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For as long as anyone can remember, the prevailing wisdom was that in order to get the best results, anyone who was TIG welding aluminum, magnesium or other alloys that required an AC arc had to use a pure tungsten electrode.

But not anymore. For the last five years the industry has made a dramatic shift toward inverter-based AC TIG welders that incorporate advanced squarewave technology to improve weld quality, increase travel speed and reduce operating costs.

However, in order to gain the maximum benefits from inverter technology, selecting the right tungsten now becomes an increasingly more critical issue. In the past, pure tungsten was the only choice for AC TIG welding. But that's no longer the case with the latest inverter technology. Today, industry experts recommend against pure tungsten in favor of the new "rare earth" tungstens. By adding elements such as cerium or lanthanum these electrodes outperform pure tungsten.

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