You want your welding table to perform and look great, but rust often makes its presence. Rust will contaminate everything it touches, the workpiece, the tools, and your hands. So, how can you prevent your welding table from rusting?
To prevent a welding table from rusting, you must keep away any form of water. Without water, rust cannot form. You can do this by avoiding direct water exposure, keeping the air’s moisture at low levels, and creating a protective water-repellent coating on the table.
After reading this article, you will know how to prevent and remove rust, and how to apply protective coatings, among other useful information to keep your table rust-free.
Rust is a combination of iron and oxygen in the presence of water. Aside from the horrible appearance and contamination issues, if rust remains on the table it will create pits and dig deeper with time.
Prevention is the best way to avoid rust issues, considering that if your table rusts once, it would be easier to rust again.
You should keep all forms of water away from the table. For example, cleaning tools and equipment on the table, placing your water or coffee, etc. Water exposure also includes your sweat after prolonged work in a hot environment.
You should wipe the water dry and blow air to vaporize the residue.
While liquid water is relatively easy to keep off the table, the air will always contain moisture.
If you live in a place with high humidity, it would be hard to keep the table rust-free. You should lower the workshop’s humidity and prevent condensation. Condensation (Wikipedia) is when the air’s moisture forms droplets on cold metal.
Controlling the moisture level in your workshop will not only protect your equipment from rust but your health too:
Another source of rust is muriatic (hydrochloric) acid vapors. Muriatic acid contains chorine that drastically accelerates the rusting process.
If you use or store muriatic acid indoors, the vapors can rust not only your table but all steel surfaces, even if you have a large workshop.
We call this flash rust, and it’s common with most acids. You should use and store strong acids outside to protect your health first and prevent rust on your equipment.
Flash rustAnother substance that accelerates rust is salt. If you clean or repair equipment that is contaminated with any form of salt on the table, any flakes or dust left on it can make it rust faster.
Pits and crevices on your table top should be filled since they can trap moisture. You can remove the damaged area with a carbide burr and weld them. Then use a flap disc to remove excessive metal to be flush with the surface.
You should also keep your table clean. Dust, shavings, workpieces, and tools can accelerate rust formation in the trapped areas.
If your welding table is permanently outside, it’s very hard to prevent rust. You need to cover it against rain and morning condensation, but also clean and maintain it more often.
If you have a rusted table, there are many ways to fix it. Rust that formed recently is superficial and quite easy to remove, but you need power tools or chemical ways to remove thick rust.
All mechanical methods create a plume of dust in the air, you should avoid breathing. You can position yourself so that the air pushes it away and wear a dust mask.
First, let’s see the mechanical ways to remove rust from a welding table:
Removing rust with chemicals requires less effort and removes it from hard-to-reach areas. However, chemicals produce vapors that are hard to capture. You can read this Weldpundit article on welding respirators, filters, and gas cartridges for more information.
Let’s see what chemicals you can use to dissolve or convert rust:
If you live in an area with high humidity or you won’t use your table for a long time, you should apply a protective coating to prevent rust from reappearing.
When your table is clean and dry, you can apply a rust inhibitor, to create a protective layer against moisture and rust. Popular ways are, WD-40, wax products, and phosphoric acid.
However, all protective layers lose their effectiveness from abrasion or if they come into contact with the welding heat.
The following chemical treatments create vapors that irritate the respiratory system, the eyes, and often, the skin. For this, you should apply them in a well-ventilated area with synthetic gloves and a face shield to protect your eyes.
Perhaps the most popular way is the WD-40 product because it’s easy to find and apply. This product is versatile because it repels moisture, lubricates the metal, and dissolves rust residues.
If this layer isn’t removed by abrasion or high heat, it can protect metals for up to one year outdoors, but not under direct contact with water, and two years indoors.
To use it, get a ready-to-use WP-40 aerosol bottle and spray it on the table. Then use a clean rag to spread it everywhere. Ensure, you only leave a thin layer behind. But, there is a better way.
Instead of using an aerosol bottle, you can buy the chemical in stock and an empty bottle with a pump and trigger. You fill the bottle, use the pump to create pressure, and press the trigger to spray the chemical. This is an economical and healthier way.
After removing rust with mechanical ways, you can use WD-40 to remove residues.
Another way to make a rust-free table top is to cover it with paste wax. There are many products that combine natural wax and other substances to make the layer more durable. The SC Johnson product is a popular example.
These waxes create a layer with strong waterproof resistance that lasts for a long time, with excellent anti-rust results. However, waxes don’t remove rust, so you need to apply them on perfectly clean surfaces.
After removing the rust using a mechanical or chemical way, use acetone or alcohol to clean the table and let it dry before applying the wax.
Another trick to try is to slightly preheat the table up to 140 °F (60 °C) with a flame torch before you apply the wax. This will make the wax spread easier and also makes the surface completely dry, which helps adhesion.
Always move the torch all over the table and never pause. Measure the temperature with a welding temperature stick or an infrared (IR) digital thermometer.
Another way to protect a welding table is by applying a solution with phosphoric acid on clean metal. This acid reacts with iron to form a black iron phosphate that offers excellent rust resistance.
This layer is perfectly safe to touch and lasts many months if not removed by abrasion or welding heat. Phosphoric acid can also remove residues.
You can apply 10-20% acid diluted in water with a painting brush or a spray bottle, leave it for a few minutes and wipe it with a clean rag. You always add the acid to the water, never the opposite.
Phosphoric acid is considered weak, but you should always wear synthetic gloves and a face shield.
Can You Paint a Welding Table?Paint is a classical way to prevent rust, but is it a good idea for a welding table?
You should not paint a welding table because paint is a fire hazard. Paint can catch fire under the welding heat, but also generate harmful gasses. Furthermore, paint is an electrical insulator and will prevent closing the circuit to start the arc.
Most types of paint are flammable, and the high temperatures of welding can start a fire. That’s the main reason you will never see a painted commercial welding table.
Even if you use heat-resistant paint, it cannot handle welding heat. If it doesn’t start a flame, it will break down and flake.
Paints are chemically complex and when they burn they generate gasses that are extremely harmful to breathe.
For the same reasons, you cannot use zinc sprays, powder coatings, etc on a welding table.
Finally, paint easily resists the low voltage current and makes it impractical to connect the working (ground) clamp on it. You can only connect the clamp to clean metal.
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