Welding cast iron- need help

We also have several alternatives to the Eutectic and Certanium specialty products that are easier on the pocket book. The arc brazing electrode is called #521 and can be seen on our site if interested. The alloy that I believe you refer to would be something like our #1290 Cu/Ni often used to repair Inconel.

• U.S. Alloys/Weld Tech

Only thing we don't really know is the mass of the part. It can be 3/16" thick w/o mass and you could quite easily braze or arc weld it. If enough mass is involved that will act as a heat sink, I would put about 300°F into it and try not exceed that too much with the interpass temps. Peen between passes to relieve residual stresses if you use that method. Also use a "U" groove instead of a "V" when prepping cast iron. As Steve says, clean the top side of the area with your grinder so you'll get a good bead contour in the transition zone. If the part is large, bury it after welding in lime, sand, vermiculite, redi-mix powder, Kao wool etc. That will allow it to cool slowly and let the carbon form free graphites which will maintain the ductile grain structure in the part.