How To Weld Cast Iron Pipe. Using the methods discussed above weld the studs in place and cover the entire surface of the break with weld deposit. Preheating or cold weld.
By performing these steps in the following order you will be able to produce an extremely durable cast iron weld. Cast irons are alloys of iron carbon and silicon may have over 2 carbon and 1-3 silicon and may include specific amounts of other elements to achieve definite characteristics. There are four steps involved in DIY cast iron welding.
This means that one or both of the surfaces to be welded are clad prior to welding.
Remove loose metal debris and rust from the pipe at the area of the hole using a steel putty knife. After welding the entire heat-affected zone cools very rapidly. During the welding of cast irons the iron immediately adjacent to the weld metal is heated to its fusion or melting point. Many times that of Gray Iron.