Structural cast-iron repair with Dillon
Ordinary high-pressure gas welding is extremely difficult on cast iron — turbulent flame, hard to control heat and melt. Dillon's 0.5 bar torch with its soft concentrated flame is what makes structural cast-iron repair practically workable.
Why both MIG and ordinary gas welding are hard
MIG puts in too much heat too fast — the cast iron cools unevenly, the joint cracks and becomes hard and brittle. Ordinary oxy-acetylene at high pressure is nearly as difficult: turbulent flame, poor heat control, and uneven melt that still cracks. Cast iron needs gradual heating and controlled cooling — something that demands full control of the flame.
Dillon's soft 0.5 bar flame — why it works
Dillon's mixing chamber produces a soft, concentrated 0.5 bar flame without turbulence. You get full control of heat input: preheat the casting gradually, use matching grey-iron rod and cast-iron flux, let the melt flow out gently, and let the structure cool slowly. The result is a homogeneous joint that behaves like the parent material.
What you need to weld cast iron
Cast iron flux
Protects the melt from oxidation and lets the cast-iron rod flow out.
Buy cast iron fluxCast iron rod
Grey-iron rod that matches the parent material's structure — gives homogeneous results.
Buy cast iron rodWire + flux pack
Complete pack with cast-iron rod and flux — everything you need to get started.
Buy packSee the repair in the workshop
Tips for best results
Preheat the casting
Warm up the cast iron gradually before you start welding. This reduces stresses and prevents new cracks.
Always use cast-iron flux
Flux protects the melt and gives a clean, tight joint. Without flux the joint oxidizes and won't hold.
Let it cool slowly
Cover the casting with insulation or sand after welding. Slow cooling prevents cracking.
You need a Dillon torch
If you already have an ordinary high-pressure gas welder, it won't work for structural cast-iron repair — you need Dillon's soft 0.5 bar flame. Standard Kit or Pro Kit includes torch, tips and accessories. You just need cylinders, regulators and hose. If you already have Dillon, just buy flux and rod above.