How To Braze Weld Cast Iron. After brazing use a wire brush to clean the brazed surface to remove any oxidation or residue. Braze welding is a common method for joining cast iron parts due to the minimal impact on the base metal itself.
Stick welding is the alternative method for welding cast iron where the electrode with flux is used. Brazing isnt really welding as it doesnt fuse the metal as a weld does. The cleaning action can be enhanced by superposing a direct current into the bath and by changing polarity a few times.
Using a grinder the crack surface should be ground out to.
Its a good option to minimize the extreme heating and cooling of the electric welding processes and its easier to maintain the temperatures of the components with it. Once the iron is nice and bright scrape the brazing rod against the surface. After brazing use a wire brush to clean the brazed surface to remove any oxidation or residue. Open the pours around the area to be repaired drill and grind out a U shape in the metal so it is no longer a hairline crack.