Straight answers to the questions people ask most when choosing and using equipment for sharpening TIG tungsten electrodes.
Why does the shape of the tungsten tip matter?
The tip shape controls how the arc behaves. A sharper point gives a narrower, more focused arc that suits thin material and low current, and is easy to start. A blunter tip, or one with a small flat on the end, handles higher current without the tip melting and gives a more stable arc with deeper penetration.
A poorly ground or irregular tip makes the arc wander, flicker or start badly. Grinding the tip properly and consistently is one of the easiest ways to improve TIG weld quality.
Why use a dedicated tungsten grinder instead of a bench grinder?
A dedicated grinder holds the tungsten at a fixed, repeatable angle, so every tip comes out the same, and it grinds with a wheel used only for tungsten. This avoids contaminating the tip with other metals, which would affect the arc. Many also catch the dust.
A general bench grinder is harder to control, the angle varies, and a wheel that has ground steel will pass particles onto the tungsten. If you do use a bench grinder, use a wheel kept only for tungsten.
What angle and shape should I grind?
It depends on your current, the material, the tungsten type and the machine. In general, a longer, sharper taper gives a narrower, more focused arc for thin work and low current, while a shorter, blunter taper tends to cope better with higher current and gives deeper penetration. For DC work a small flat at the tip is often used.
For AC welding, including aluminium, the tip is often blunter or lightly rounded, but this varies with the tungsten type. Follow the guidance from your machine and tungsten makers, then adjust by trial welds.
In which direction should I grind the tungsten?
Grinding lengthways is generally recommended, so the grinding marks run along the tungsten towards the tip rather than around it. Marks running along the length usually help the arc run straight from the tip, while marks around the electrode can make the arc wander or spread.
A dedicated grinder with a holder usually takes care of this by holding the tungsten at a fixed position. If you grind by hand, hold the tungsten steady and keep the marks pointing towards the tip. Check your tungsten maker's guidance as well.
What is a wet grinding system and how does it differ from dry?
In a wet system, a liquid is used at the grinding wheel to keep the work cool and to trap the fine tungsten dust, so less dust is released into the air. Dry systems usually have an extraction or filter instead.
Some grinders supply a liquid for wet cutting and grinding. Follow the maker's instructions for the correct liquid and its disposal. Whichever system you use, treat the dust with care and keep to the maker's guidance.
Is tungsten dust dangerous?
Grinding dust should be controlled whatever the tungsten type. Thoriated tungsten is mildly radioactive, and the main concern is breathing in or swallowing the dust, so many workshops use other types. The dust of any type is an irritant that you should not breathe in, and the sparks and fragments are an eye hazard.
Grind with dust extraction or a system that captures it, wear eye protection, avoid blowing dust away, and wash your hands afterwards. Follow the HSE guidance, the maker's instructions and your own risk assessment, including for disposal of the dust.