Welcome visitor you can login or create an account.

Currency: US Dollar

MuggyWeld LLC

0 item(s) - $0.00

Your shopping cart is empty!

Welding Cast Iron



These pics come from a new aerospace test facility that they are constructing at the University of Notre Dame. The SSF-6 is working great.


welding stainless steel

I am attempting to make all of these fittings air tight as they are used for pressure measurements. We can¹t have any leaks. I had very little warpage of my base metal and I think this is really going to work out very well.


silver solder high strength metal repair

Thank you,


David Hipskind
Turbomachinery Technician
The University of Notre Dame
Institute for Flow Physics and Control (FLOWPAC)
The Hessert Laboratory for Aerospace Research


Stay Connected


Please observe proper AWS safety guidelines

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, welding cast iron is an essential process that welders and craftsmen in the industry must learn. Despite the brittle and temperamental qualities of cast iron, welding it is not impossible to do, provided that you have the right materials on hand. 


Cast iron is difficult to work on because most nickel rods used by welders are harder compared to the base metal. Welding cast iron increases the base metal's tendency to crack, just like how a window with a rock cooled in the center is more likely to shatter into pieces. However, our 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 process.  


  77 Electrode 72 Electrode SSF-6 Silver Solder
Sizes available 5/32", 3/32", 1/8" 5/32", 3/32", 1/8" 1/16"
Arc - TIG - Braze Arc - TIG Arc - TIG Braze
Works on engine blocks Yes No Yes
Works on large cast iron holes Yes Yes No
Joins cast iron to steel Yes Yes Yes
Joins cast iron to metals other than steel No No Yes
Works on exhaust manifolds, woodstoves, or other burnt cast iron Good Great Good
Works on thin cast iron Yes Yes Yes, even very thin
Color match? Fair Fair Fair
All position? Yes Yes Yes
Machineable? Yes No Yes
Paintable? Yes Yes Yes
Works over existing welds? Fair-- better on unwelded surface Fair Great
Depth to bevel cracks 3/4 through 3/4 through 1/2 way through
Crack resistant? Yes No No


Make welding cast iron a breeze with high quality products from us here at Muggy Weld. For more information on cast iron repair, and to watch instructional videos, click the links below

Cast Iron Welding Videos

How to Weld Dirty Cast Iron Parts

How to Weld Dirty Cast Iron PartsNew!

Muggy Weld 72 Electrode is used to weld a burnt cast iron manifold

Cast Iron Carburetor Repair with Silver Solder

Cast Iron Carburetor Repair with Silver Solder

SSF-6 Silver Solder is used to repair a cast iron body carburetor.

Monkey Metal Repair Tips

Cast Iron Welding Tips 

Below is a customer testimonial for http://www.MuggyWeld.com 77 arc welding electrode.

How to Weld a Boat Cast Iron Exhaust Manifold

How to Weld a Boat Cast Iron Exhaust Manifold 

A Cast Iron Mercruiser Exhaust Manifold is repaired with 77 Electrode

Easy Cast Iron Engine Block Welding

Easy Cast Iron Engine Block Welding 

Welding a Yanmar cast iron engine block with MuggyWeld 77

Cast Iron Welding a Stover Pump Base

Muggy Weld customer Herman Ginger Herman, a self-described "novice" welder, welds a cast iron Stover Pump Base with 77 arc rods and a Miller AC/DC 225 amp welder.

1986 580 E Case Backhoe Repair

Muggy Weld customer Richard Nicholas Jr. repairs the front axle on a 1986 580 E Case backhoe, using 77 cast iron electrode and an AC arc welder . The king pin bearings were gone, and the pins had worn into the axle.

Crack Free Cast Iron Welding 

Whether you're working with gray cast iron, malleable cast iron, or nodular cast iron, Muggy Weld 77 electrode can make the repair--simply, quickly, and without pre-heating or special cooling procedures.

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

Josh Colson from Auburn Muffler and Auto Repair in Auburn, Washington, is using SSF-6 Silver Solder by MuggyWeld.com, to braze a cast iron flange to aluminized steel tubing for better air flow.

Cast Iron Welding: How to Weld a Cast Iron Engine Block

1989 Continental Diesel Cast Iron Engine Block with a sizable hole punched through from a rod was welded with MuggyWeld 77 Cast Iron electrodes. Our customer used TIG welding for this motor, but many of these engines have been repaired using arc or stick, even with an old buzzbox.

Welding a Jeep Wrangler Engine Block with 77 Cast Iron Electrode

Muggy Weld customer Mike Timm welded his 2004 Jeep Wrangler engine block, which had a piston skirt blow a hole in the side of the motor.

Cast Iron Welding: Cummins Diesel Cast Iron Exhaust Manifold Repair

Second repair on Cummins exhaust manifold. Mike used a 130 amp mini welder to make the repair, to demonstrate a worst case scenario for using our electrodes.

Cast Iron Welding: Cast Iron Exhaust Manifold Repair

A cast iron exhaust manifold is brazed with SSF-6 Silver Solder. We cleaned a 3 to 4 inch cut, then silver soldered the cut with an oxyacetylene torch.

Cast Iron Welding: Cast Iron Fireplace Stand Repair

This fireplace stand had a broken-off leg, so we wire wheeled the paint off and used our 77 electrode with a 130 amp mini welder to make the repair.

Cast Iron Welding: Cast Iron Diesel Marine Blower is Repaired with 77 Electrode

This blower has a large cut into the cast iron. We used a grinding wheel to bevel halfway through, and made the repair with our 77 cast iron rod and a 130 mini amp welder. After making the repair we used a grinding wheel to smooth the surface, and the part was as good as new.