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welding cast iron
Welding Cast Iron - What Is It
And How Does It Work
Welding cast iron, the process of joining two pieces of cast iron using a weld

Cast iron is formed by pouring molten iron into a cast of the finished item. Once the iron is solidified, the cast is removed and the iron retains the shape of the cast.

Because of this process of manufacture and the qualities of cast iron, welding cast iron is very difficult.

The main problem is that cast iron cannot stretch and withstand the contraction and hardening caused by welding cast iron with preheating below 1200°F.

Cast iron welding requires temperatures of at least 900°F for brazing and 1300°F for fusion welding.

Each part of the cast iron expands and contracts at different rates so a successful weld needs uniform and controlled heating across all areas and the skill to complete the weld thoroughly.

The full process involves the careful preparation of both surfaces before applying the heat and flux to fuse the surfaces together. A cooling down sequence prevents the cast iron from hardening and becoming brittle.

Fusion Welding

Fusion welding is a skill that can take years to master. It requires the actual melting and puddling of base metal as the filler material is added.

Fusion welding is used primarily on dense castings that can be machined after the welding is done.

Cylinder heads are excellent subjects for fusion welding.

When done well, welding cast iron, and the subsequent tidying up, will be invisible to the eye and will easily retain the strength of the original cast iron.

Welding cast iron can be used to repair cracks, breaks, pitting and general damage through use.

For more information, please follow the link below:

Welding Cast Iron

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