Rod Size | Amps | Amazon | Shopify |
---|---|---|---|
3/32" | 50-80 | [see price on Amazon] | [see price on Shopify] |
1/8" | 80-120 | [see price on Amazon] | [see price on Shopify] |
5/32" | 110-140 | [see price on Amazon] | [see price on Shopify] |
3/16" | 130-170 | [see price on Amazon] | [see price on Shopify] |
To weld cast iron to mild steel, begin by thoroughly cleaning both surfaces to remove any oil, rust, or paint. Preheat the cast iron to approximately 400–600°F to minimize the risk of cracking caused by thermal shock. Use a nickel-based electrode, preferably an ENiFe-CI (Nickel 55) rod, which offers good ductility and compatibility with both metals. If only minor machining is needed, this is the most balanced option. Perform short, controlled welds to limit heat input, and after each weld pass, lightly peen the weld bead with a hammer to relieve internal stresses. Once welding is complete, allow the piece to cool slowly by wrapping it in an insulating blanket or burying it in dry sand to prevent rapid cooling, which can lead to cracks. This procedure helps ensure a stronger, more stable joint between cast iron and mild steel.
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