Smarter Cast Iron Welding | Discover Muggy Weld Solutions

Cast iron is strong, wear-resistant, and inexpensive. Because it's an extremely versatile material, this metal is used in literally thousands of industrial products. Therefore, cast iron welding is an essential process that welders and craftsmen in the industry must learn. Despite the brittle and temperamental qualities of cast iron, welding steel to cast iron is not impossible to do, provided that you have the right materials on hand and use proper cast iron welding procedures.

Cast iron can be difficult to work on because most nickel rods used by welders are harder than the base metal. The hard spot created by nickel cast iron welding rods increases the base metal's tendency to crack, much like how a window with a rock cooled in the center is more likely to shatter into pieces. Muggy Weld cast iron electrodes possess a different metallurgical makeup—they are softer, highly machinable, and have unique properties that allow the weld to stretch and elongate up to 300 percent more than other rods. This helps prevents the base metal and weld from cracking in the cast iron welding process--without preheating or special cooling.

Who We Are

Muggy Weld proudly provides high-quality alloys and electrodes for welding aluminum, steel, pot metal, cast iron, and various other metals. Our superior rod and flux combinations are expertly composed and work in sync. The end result is ideal for organizations looking to save money and time.

Browse Our Videos

The cast iron welding process can be complex, but we have included helpful videos to educate you on how to properly complete all the steps. At Muggy Weld, we are not just a company that wants to sell you our products—we want you to become informed about the cast iron welding process and feel comfortable with it.

Learn everything you need to know about the best ways to weld cast iron below.

	77 Non-Cracking Cast Iron Welding Rod	72 Burnt Cast Iron Welding Rod	75 Nickel Iron Electrode for Malleable, Ductile, and Nodular Cast Irons	SSF-6 High Strength 56% Silver Solder

Sizes Available (in.)	5/32in, 1/8in, 3/32in	5/32in, 1/8in, 3/32in	3/32in, 1/8in, 5/32in	1/16in
Sizes Available (mm)	3.96mm, 3.17mm, 2.38mm	3.96mm, 3.17mm, 2.38mm	2.38mm, 3.17mm, 3.96mm	1.58mm
Arc - TIG - Braze	Arc - TIG	Arc - TIG	Arc - TIG	Braze
Works on engine blocks?	Yes	No	No	Yes
Works on large cast iron holes?	Yes	Yes	Yes	No
Joins cast iron to steel?	Yes	Yes	Yes	No
Joins cast iron to metals other than steel?	No	No	No	Yes
Works on exhaust manifolds, woodstoves, or other burnt cast iron?	Good	Great	No	Good
Works on thin cast iron?	Yes	Yes	Yes	Yes, even very thin
Color match?	Good	Good	Good	No
All position?	Yes	Yes	Yes	Yes
Machineable?	Yes	No	Yes	Yes
Paintable?	Yes	Yes	Yes	Yes
Works over existing welds?	Fair-- better on unwelded surface	Fair	Over nickel, yes	Great
Crack resistant?	Yes	No	No	Yes
Depth to bevel cracks	3/4 through	3/4 through	3/4 through	1/2 through

Cast Iron Welding Videos

How to Weld a Cast Iron Marine Engine

How to Weld a Cast Iron Vise with 77 Cast Iron Welding Rods

Muggy Weld Customer Reviews/Testimonials

Cast Iron Tractor Steering Arm Welding with 75 Electrode

Welding Cast Iron--Visual Test of Muggy Weld

TIG Welding Cast Iron with 77 electrode

Stick Welding Cast Iron with Muggy Weld 72 and 77 Rods

Before & After Photos of Muggy Weld Repairs

Premium Welding Rods and Fluxes for Brazing, Soldering and Welding

Welding a Cast Iron Diesel Marine Blower

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Brazing a Cast Iron Exhaust Manifold with SSF-6

How to Weld a Cast Iron Engine Block

How to Weld a Cast Iron Exhaust Manifold

Weld a Cast Iron Engine Block

Crack-Free Cast Iron Welding with 77 Electrode

How to Weld a Case Backhoe Cast Iron Front Axle with 77 Electrode

Cast Iron Welding a Stover Pump Base

Easy Cast Iron Engine Block Welding

Weld a Boat Cast Iron Exhaust Manifold

Craftsman Mounting Bracket Welded with 77 Cast Iron Electrode

How to Repair a Cast Iron Carburetor with Silver Solder

Silver Soldering a Cast Iron Flange to Aluminized Steel Tubing for RX 7

Cast Iron Exhaust Manifold Brazing with Silver Solder

How to Weld Dirty Cast Iron Parts with 72 Electrode