Næxon

A grill mounted on a welding rig is about as blue-collar as outdoor cooking gets. You finish the morning’s work, fire up the grill at lunch, and suddenly half the crew finds a reason to walk past your truck.

The classic version uses the unmistakable shape of an old oxygen cylinder. It is narrow enough for a rig bed, heavy enough to take abuse, and has the industrial look that fits naturally beside a welding machine and toolboxes.

This guide covers the concept of turning a retired oxygen cylinder into a compact truck-mounted charcoal grill, including the grill layout, grate, lid, airflow, mounting system, and finishing details.

Before Anything Else: The Cylinder Must Be Professionally Decommissioned

This is the most important part of the entire project.

Do not assume an oxygen cylinder is safe to cut simply because the gauge reads zero, the valve has been removed, or somebody says it is empty. A compressed-gas cylinder is a pressure vessel, and cutting, grinding, drilling, or welding one can create serious hazards.

For this project, start only with an actual retired oxygen cylinder that has already been professionally decommissioned and confirmed suitable for hot work.

Do not attempt to make a questionable cylinder safe yourself.

Once you have a properly decommissioned cylinder, the fabrication concept becomes much more straightforward.

The Basic Design

The simplest design keeps the recognizable oxygen-cylinder profile while turning the center section into the cooking chamber.

The upper portion becomes a hinged lid. A removable steel cooking grate runs lengthwise through the cylinder, with the charcoal or heat source underneath it.

Small adjustable air openings provide combustion airflow, while the original rounded shoulder and neck can remain part of the finished appearance.

The result is essentially a miniature horizontal barrel grill shaped like an oxygen bottle.

What You’ll Need

The exact materials depend on the size of the cylinder and how you intend to mount the grill, but the basic fabrication normally requires a professionally decommissioned oxygen cylinder, appropriately rated steel cooking grate or untreated expanded metal, heavy steel hinges, a heat-isolated handle, positive lid latch, steel angle or flat bar for grate supports, steel plate or structural material for the mounting cradle, appropriate fasteners, and high-temperature exterior coating.

Avoid galvanized material in the heated cooking chamber.

Step 1: Plan the Grill Before Fabricating It

Before modifying the decommissioned cylinder, decide exactly where the grill will sit on the truck.

Measure the available space around the welding machine, toolboxes, headache rack and other equipment. Make sure the lid will have enough room to open fully.

The grill should be positioned well away from compressed-gas cylinders, fuel containers, fill points and other combustible or heat-sensitive equipment.

This is also when you determine which direction the lid should open.

Step 2: Lay Out the Cooking Chamber

The goal isn’t to remove half of the cylinder.

Leaving substantial material around the ends and lower portion helps preserve the cylinder’s rigidity and gives the finished grill its distinctive bottle shape.

The cooking opening normally runs lengthwise along the upper portion of the cylindrical body.

Think of the basic arrangement as:

Lid

Cooking grate

Heat/charcoal zone

Lower airflow area

Keeping the cooking grate removable makes cleaning and maintenance considerably easier.

Step 3: Build the Hinged Lid

The removed upper section becomes the lid.

Smooth and finish all fabricated edges so there are no sharp surfaces around an area people will constantly be reaching into.

Heavy-duty hinges along the rear edge support the lid.

A lid stop is also useful so the lid cannot swing too far backward and overload the hinges.

Finally, install a handle designed so that somebody doesn’t grab a piece of steel that has become nearly as hot as the grill itself.

Step 4: Install the Cooking-Grate Supports

Install steel supports inside the cylinder so the cooking grate sits securely and level.

The grate should remain removable.

That makes it much easier to remove ash, clean grease, inspect the interior and replace the grate later.

The cooking surface should also sit far enough above the charcoal area to provide reasonable heat distribution rather than placing the food directly against the fire.

Step 5: Give the Fire Airflow

A charcoal grill needs air.

The basic principle is to introduce fresh air relatively low in the cooking chamber while allowing hot gases to move through and escape higher in the grill.

Adjustable vents give you considerably more control than permanently open holes.

More oxygen generally produces a hotter, faster-burning fire. Restricting the intake slows combustion.

This simple airflow control turns the cylinder from a steel box holding charcoal into a much more usable grill.

Step 6: Add a Charcoal Tray

A removable charcoal tray is worth building.

Instead of allowing charcoal and ash to sit directly against the bottom of the cylinder, the tray provides a dedicated fire area and simplifies cleanup.

Leave space underneath for airflow and ash.

After cooking, you can remove the grate and tray rather than trying to shovel everything out of a narrow cylindrical chamber.

Step 7: Install the Handle and Transport Latch

A rig grill has one requirement that a backyard grill doesn’t:

It travels down the highway.

The lid therefore needs a positive mechanical latch.

Do not depend on gravity to hold it shut.

The latch should keep the lid closed through vibration, potholes, jobsite roads and normal highway travel.

The grate, charcoal tray and any other removable components should also be secured before the truck moves.

Step 8: Build a Dedicated Mounting Cradle

Don’t treat the grill itself as the truck mount.

Build a structural cradle underneath it.

Two supports can cradle the cylindrical body while a frame underneath distributes the load into the truck mounting points.

This also gives you a convenient location for mounting hardware without compromising the cooking chamber.

A good mount has to deal with more than the static weight of the grill. Every bump creates additional forces through the brackets and fasteners.

Step 9: Choose the Rig-Truck Mounting Position

There are several practical layouts.

A headache-rack mount keeps the grill relatively high and leaves more bed space available.

A toolbox-side mount works particularly well on service bodies and dedicated welding beds.

A flatbed-side mount makes the grill easy to reach while preserving most of the center bed.

A removable receiver-style cradle is another excellent approach because the entire grill can be taken off the truck when it isn’t needed.

Whatever configuration you choose, the structural mounting should be appropriate for the vehicle and verified by someone competent in vehicle fabrication.

Step 10: Add the Small Details

This is where a homemade rig grill becomes genuinely useful.

Consider adding a thermometer, removable grease cup, utensil hooks, folding preparation shelf and lid stop.

A small bottle opener isn’t exactly essential equipment.

But realistically, somebody is probably going to weld one onto it anyway.

Keep accessories compact and securely mounted. Anything attached to a truck eventually experiences vibration.

Step 11: Clean and Finish the Grill

Remove loose rust, scale, sharp edges, fabrication debris and contaminants.

Use coatings intended for the temperatures they will actually experience, and keep ordinary paints and unsuitable coatings away from food-contact and high-heat interior surfaces.

The rugged bare-steel appearance can look excellent, but bare steel requires maintenance to prevent corrosion.

Step 12: Perform the First Burn Away From the Truck

The first firing should happen with the grill off the vehicle.

Use that burn to check airflow, lid operation, grate stability, handle temperature, smoke leakage and overall heat behavior.

This is also the opportunity to discover that a bracket, handle or latch gets hotter than expected before the grill is sitting beside expensive welding equipment.

After the grill has cooled completely, inspect everything again.

Mounting It on the Welding Rig

Once the grill has passed its initial testing, install it in the planned location.

Check clearance with the tailgate, toolbox doors, welding leads and anything else that moves.

Then look at the installation from another perspective:

What happens when the truck hits a serious pothole?

The grill shouldn’t shift. The lid shouldn’t open. The grate shouldn’t bounce out. The mounting brackets shouldn’t flex excessively.

A truck-mounted grill should be treated like permanently transported equipment rather than something simply sitting on the bed.

Never Cook Beside Stored Oxygen or Fuel-Gas Cylinders

Just because the grill started life looking like an oxygen bottle doesn’t mean it belongs beside the cylinders currently being used for welding.

Maintain proper separation from compressed gases, fuel sources and combustible equipment, and follow the applicable jobsite and employer requirements.

Some industrial facilities prohibit open flames entirely, so a rig grill that works perfectly on one project may have to stay cold on another.

Never Drive With It Hot

This is another rule worth making non-negotiable.

Don’t finish lunch, close the lid and immediately head down the highway.

Extinguish the fire completely and allow the grill and its contents to cool before moving the truck. Secure loose components and verify that no hot ash or burning material remains.

Why the Oxygen-Cylinder Grill Became a Rig Classic

Part of the appeal is practical. The long cylindrical shape fits naturally along a welding bed without consuming the space of a conventional backyard grill.

But there’s another reason these things get attention.

They’re unmistakably homemade.

A professionally decommissioned cylinder, some steel, a welder and a little creativity can produce something that looks completely at home on a working rig.

Every one ends up slightly different.

Some are clean and professionally finished. Others look like they’ve survived ten shutdowns, three welding machines and half a million highway miles.

Both somehow look right.

The Finished Rig

The best version isn’t necessarily the biggest or most elaborate.

It has a solid cooking grate, controllable airflow, a lid that works properly, a positive transport latch, a strong structural cradle and a mounting position that doesn’t interfere with the rest of the truck.

Build around function first.

Then let it earn the scratches, smoke stains and jobsite stories naturally.

Because once the crew discovers there’s a working grill on your rig, there’s one final modification you may need:

A bigger cooking grate.