77 Cast Iron Welding Rod for Crack Resistant Weld

77 is a premium cast iron welding rod that produces machinable welds which are high strength, crack resistant, and porosity free when applied to a wide variety of cast irons.  The special tri-metal core wire has a high current carrying capacity and the specially designed coating converts the impurities of the base metal into slag instead of being trapped in the deposit. The high deposition rate creates an extremely narrow heat affected zone– a feature suitable for all weldable cast irons requiring post weld machining.

77 cast iron welding electrodes are softer than nickel rods and have unique properties that allow the cast iron welds to stretch and elongate up to 300 percent more than other rods. This helps prevent the base metal and weld from cracking in the process.

Key Features:

• Developed specifically for maintenance applications
• Welds all types of cast iron, thick or thin
• Good color match to cast iron
• Crack-resistant formula eliminates the need for pre-heating or special cooling
• Works in all positions, including overhead
• Coating is electrically conductive, eliminating core-wire overheating
• High deposition rate, fluidity, and even heat conduction create fully machinable welds
• Special formulation compensates for shrinkage as the base metal cools, eliminating the contraction that can cause cracking
• Ideal for heavy machinery, trucking, bus lines, automotive, marine, and RVs
• Repair cast iron exhaust manifolds, engine blocks, transmission housings, cylinder heads, industrial machines and more

 

Kit Includes:

1/2 lb

• 3/32″ diameter:  14 rods 12 inch length
• 1/8″ diameter:  7 rods, 14 inch length
• 5/32″ diameter:  4 rods, 14 inch length

1 lb

• 3/32″ diameter:  28 rods 12 inch length
• 1/8″ diameter:  14 rods, 14 inch length
• 5/32″ diameter:  9 rods, 14 inch length

5 lb

• 3/32″ diameter:  168 rods 12 inch length
• 1/8″ diameter:  84 rods, 14 inch length
• 5/32″ diameter:  54 rods, 14 inch length

Instructions for Use:

1. Prepare the Surface: Before you begin welding, drill holes at each end of the crack to help prevent the crack from propagating further.
2. Align the Parts: If necessary, align the parts and tack weld them in place to secure them during the welding process.
3. Guide the Electrode at a Steep Angle: For best results, guide the electrode at a steep angle, keeping the arc length as short as possible. This ensures a stable arc and prevents excess heat from building up.
4. Use Short Staggered Passes: Use short, staggered passes to minimize heat input and ensure a smooth, even weld. This will help reduce the risk of cracking and distortion in the base material.

For burnt or heat-affected cast iron, use https://www.muggyweld.com/product/72-electrode/