Fans of shish kebab and pilaf know: the real taste of the dish is revealed only when cooked over wood or coals. But you don’t always have a ready-made grill or oven at hand, especially at the dacha or on a camping trip. Hearth for a cauldron made from car rims - a budget and functional solution that can be assembled in 2-3 hours from scrap materials. This design can withstand high temperatures, provides uniform heating and looks stylish in the recreation area.

In this article - step by step instructions with drawings, a list of tools and life hacks from the masters. We will look at which discs are best suited, how to avoid mistakes when welding and how to protect the metal from corrosion. And also - 3 design options (from simple to multifunctional) and operating tips so that your fireplace lasts for more than one season.

⚠️ Important: Working with an angle grinder and a welding machine requires compliance with safety precautions. If you don't have experience, leave the welding to a professional - mistakes during assembly can lead to a fire or carbon monoxide poisoning.

1. What disks are suitable for a fireplace under a cauldron?

Not every car wheel is suitable for the oven. Main selection criteria:

  • 🔧 Material: only steel wheels (cast aluminum melts at high temperatures). Labeling usually starts with 5.5J, 6J etc.
  • 📏 Size: optimal diameter - R15–R17. Discs R13–R14 too small for a standard cauldron (diameter 30–40 cm), and R18+ difficult to weld without professional equipment.
  • 🔄 Condition: Avoid discs with severe corrosion or deformation. Cracks and deep dents weaken the metal and can separate when heated.
  • 🚗 Origin: It’s better to take wheels from passenger cars (VAZ, Toyota, Ford). Truck rims are too heavy and require a powerful welding machine.

Where can I get the discs? Options:

  • 🛒 Buy used ones at a disassembly site (cost - from 300 to 1000 ₽ per piece).
  • 🔧 Ask at car services - often unnecessary discs accumulate there after replacement.
  • 📢 Post an ad in local groups: many give them away for free.

Advice: For a fireplace, 2–3 disks are enough (depending on the design). If you plan to make a stove with a blower, take 4–5 pieces.

📊 How many disks are you willing to spend on the hearth?
1–2
3–4
5 or more
I haven't decided yet

2. Tools and materials: complete checklist

Before starting work, prepare everything you need. What you definitely can’t do without:

Grinder (angle grinder) with cutting and grinding wheel

Welding machine (inverter with power from 160 A)

Electrodes with a diameter of 3–4 mm (for example, ANO-21 or MP-3)

Hammer and chisel for smoothing edges

Tape measure, marker, level

Protective mask, gloves and overalls

Wire brush for cleaning seams

Primer for metal and heat-resistant paint (withstands up to 600–800°C)

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Additionally you may need:

  • 🔩 Fastening: bolts M8–M10 with nuts (if you do not weld some elements).
  • 🔥 Refractory brick or fireclay clay for lining (optional, increases service life).
  • 🛠️ Vise or clamps for fixing discs during welding.

Attention: Do not use discs with rubber or plastic residue (for example, from hubcaps). When heated, they release toxic substances!

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Before welding, clean the discs from rust and dirt with a grinder and a grinding wheel. This will improve the quality of the seam and protect against corrosion.

3. Drawings and diagrams: 3 design options

The choice of design depends on your needs:

  1. Simple hearth of 2 discs - for a small cauldron (up to 30 cm). Suitable for hiking.
  2. Fireplace with ash pit — improves traction, wood burns more evenly.
  3. Multifunction oven — with a shelf for coals and a removable lid (can be used as a smokehouse).

Example drawing for option No. 2 (with blower):

element Dimensions (cm) Number of disks Notes
Base (bottom disk) Diameter 40–45 1 Cut out the center, leaving a rim 10–12 cm wide
Housing (middle disk) Height 20–25 1 The center is not cut out, welded to the base
Blower (hole) 10×15 — Cut out in the lower part of the body with a grinder
Cover (top disc) Diameter 40–45 1 Welded hinge for opening
Legs Length 15–20 — Made from reinforcement or disc scraps

📌 Download drawings in PDF format: (in development).

How to calculate the height of the fireplace?

The height depends on the diameter of the cauldron:

- Kazan 30–36 cm → hearth height 25–30 cm.

- Kazan 40–50 cm → height 35–45 cm.

A fireplace that is too low will produce smoke, and a fireplace that is too high will not heat well.

4. Step-by-step instructions: how to cook a hearth in 3 hours

Let's look at the assembly using the example of a fireplace with an ash pit (option No. 2).

Step 1: Prepare Disks

1. Remove any remaining rubber, dirt and rust from the rims with a grinder.

2. B lower disk (base) cut out the center, leaving a rim 10–12 cm wide. Clean the edges.

3. B middle disk (case) cut a hole for the blower measuring 10x15 cm. Place it 5 cm above the base.

Step 2: Welding the body

1. Place the middle disk on the base and weld it in 3-4 points.

2. Weld the seam around the entire perimeter. Make sure there are no penetrations!

3. For strength, weld transverse ribs from scrap metal inside the body (optional).

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Use interrupted seam (every 2–3 cm) if you are welding thin metal. This will prevent the discs from becoming deformed.

Step 3: Installing the blower and legs

1. Weld a damper from a cut piece of metal to the blower hole. Secure it to the loop.

2. Weld 3–4 legs from reinforcement or disc scraps. The optimal height is 15–20 cm for stability.

Step 4: Cover and Finishing

1. Weld a loop and a handle to the upper disk (lid).

2. Clean all seams with a wire brush.

3. Cover the fireplace with heat-resistant paint (for example, Kudo KU-6001 or Certa Plast).

⚠️ Attention: Do not use regular paint - it releases toxic substances when heated! Heat-resistant paint can withstand up to 600–800°C.

5. Top 5 beginner mistakes and how to avoid them

Even a simple design can fail if the nuances are not taken into account. We tell you what most often spoils the hearth:

  • 🔥 The metal is too thin. Discs from small cars (Daewoo Matiz, Oka) thinner than 3 mm - they burn out in 1–2 seasons. Take discs from VAZ 2107, Toyota Camry or SUVs.
  • 🔧 Poor welding of seams. If the seam is not sealed, ash will fly out through the cracks. Check the tightness by covering the seams with chalk: when heated, the chalk will darken in places of leaks.
  • 🌬️ Lack of ventilation. Without a blower or holes in the lower disk, the wood burns poorly, and smoke comes into your face. The minimum cross-section of the blower is 100 cm².
  • 💦 Using wet firewood. Damp wood produces little heat and forms condensation, which accelerates corrosion. Store firewood under a shed.
  • 🎨 Saving on paint. Regular enamel peels off after the first ignition. Heat-resistant paint costs from 500 ₽ per can, but extends the service life by 3-4 times.

Critical error: ignoring the gap between the cauldron and the edges of the fireplace. The optimal gap is 2–3 cm. If the cauldron sits too tightly, the heat goes up and does not heat the walls.

6. How to care for your fireplace: 7 rules for durability

The service life of a homemade hearth is from 3 to 10 years, depending on care. To prevent the metal from rusting and the seams from cracking:

  • 🧹 Clean after every use. Remove ash and soot with a wire brush. Do not use water - it is corrosive.
  • 🌧️ Storage. Cover the fireplace with a tarp or thick cloth. In wet weather, place it under a canopy.
  • 🔥 Warming up For the first 10–15 minutes, light the fireplace on a low flame so that the metal heats up evenly.
  • 🛠️ Repair. Inspect the seams every season. Fill cracks right away - they spread quickly.
  • 🧴 Lubrication. Lubricate the lid hinges with graphite grease 1–2 times a year.
  • 🔩 Fasteners Check the reliability of the legs and the blower flap.
  • 🌿 Firewood. Use birch, oak or fruit wood. Coniferous firewood produces a lot of soot.

💡 Lifehack: To prevent the hearth from rusting from the inside, wipe its walls after cleaning vegetable oil (in a thin layer). It creates a protective film.

7. Alternative ideas: what else can be made from disks

If there are extra disks left, do not rush to throw them away. From these we get:

  • 🔥 Barbecue grill. It is enough to weld the legs and a grid of reinforcement to the disk.
  • 🪑 Picnic table. Two disks (base and table top) + stand pipe. The countertop can be tiled.
  • 🚜 Smokehouse. Sealed hearth with lid and hooks for food.
  • 🌺 Flower garden. The disk is cut in half and filled with earth. Suitable for succulents.
  • 🛡️ Fence or gate. The discs are welded to the frame vertically - you get a stylish fence in the style steampunk.

📌 Inspiration: B our VK group (in development) - 50 photos of ideas from CDs with step-by-step instructions.

FAQ: Answers to frequently asked questions

Is it possible to use rims from trucks (eg KAMAZ or ZIL)?

You can, but keep in mind:

  • The metal thickness of cargo disks is 5–8 mm. For welding you need a machine with a power of 200 A or more.
  • The weight of the finished fireplace will be 20–30 kg (difficult to transport).
  • Suitable for large cauldrons (50+ cm) or a stationary stove in the country.
What kind of welding machine is needed for disks?

Minimum requirements:

  • Current: 140–160 A (for discs 3–4 mm thick).
  • Type: inverter (eg Resanta SAI-190 or Svarog ARC 200).
  • Electrodes: ANO-21 or MR-3 with a diameter of 3 mm.

For beginners, a semi-automatic machine with wire is suitable 0.8 mm — it’s easier for them to weld thin metal.

How to paint the hearth so that the paint does not peel off?

Use heat-resistant paints:

Brand Max. temperature Price (per 0.5 l) Features
Kudo KU-6001 650°C 600 ₽ Matte, dries quickly
Certa Plast 800°C 750 ₽ Glossy, oil resistant
Bosny 600°C 550 ₽ In a can, easy to apply

Before painting, degrease the metal with a solvent and heat the fireplace to 100–150°C.

Can the fireplace be used in a gazebo or under a canopy?

Yes, but with reservations:

  • The distance to the walls/ceiling is at least 1 m.
  • The floor under the fireplace must be non-flammable (concrete, tile, metal).
  • Ventilation is required - carbon monoxide is deadly!
  • Do not use in enclosed spaces (garage, shed).

💡 Advice: Buy carbon monoxide sensor (costs from 1000 ₽) and hang it in the gazebo.

How much firewood is needed to heat a 5 liter cauldron?

Approximate calculation:

  • For heating up to 100°C: 1–1.5 kg of dry firewood (birch, oak).
  • To maintain temperature: 0.5–0.7 kg/hour.
  • Warm-up time: 20–30 minutes.

📌 Coal takes longer to burn (40-50 minutes), but provides more uniform heating.