Cast iron used in many household and industrial structures. Cast iron is brittle by nature and can be prone to cracks and breaks. Large changes in temperature, thermal gradients and physical shocks such as drops can cause cracks. Cast iron can be repaired using welding techniques, but this is difficult and can cause further damage. Speaker, a technique that uses less heat than welding, often used to repair cracks in cast iron pieces.
Instructions
Choose a filler rod. A filler rod is selected based on the application of the cast iron. Filler rods used for brazing cast iron is often made of nickel or brass. Some assemblers use a filler rod containing flux, while others prefer to use a separate flux during the brazing process.
Prepare the surface cracks. Cracks in the cast iron should be cleaned and prepared before brazing to eliminate impurities and oxide surfaces. Cracks should be ground using a grinder to form a U-shaped cross section. This allows the brazing material to completely flow into the gap and avoid stress concentration.
After grinding, brush the ground using a stainless steel brush. This step will remove any remaining particles from the grinding process.
Heat a cast iron parts. If a brazing torch is used in the cold, cracking and warping further can happen, so that the heat source such as a gas grill, stove or oven weeds can be used to slowly heat the cast iron.
Place a piece of cast iron to the surface of the work and reinforce if necessary. Some parts may require greater heating during brazing process, especially if large cracks and brazing process will take some time. Use an external heater to maintain the temperature of the piece.
Use a brazing torch to heat the surface of the cracks until they turn bright red. Touch the filler rod into the crack surface: the surface temperature must be hot enough to cause the filler rod material to flow into the gap. Use the torch to maintain the local temperature while walking down the crack.
Put the sand into the container repaired and completely covered with sand section. After brazing, the repaired cast iron should be cooled very slowly. If the part is left in the cold, can be cracked. Let the inside of the sand for at least one day, longer if a large part.
Choose a filler rod. A filler rod is selected based on the application of the cast iron. Filler rods used for brazing cast iron is often made of nickel or brass. Some assemblers use a filler rod containing flux, while others prefer to use a separate flux during the brazing process.
Prepare the surface cracks. Cracks in the cast iron should be cleaned and prepared before brazing to eliminate impurities and oxide surfaces. Cracks should be ground using a grinder to form a U-shaped cross section. This allows the brazing material to completely flow into the gap and avoid stress concentration.
After grinding, brush the ground using a stainless steel brush. This step will remove any remaining particles from the grinding process.
Heat a cast iron parts. If a brazing torch is used in the cold, cracking and warping further can happen, so that the heat source such as a gas grill, stove or oven weeds can be used to slowly heat the cast iron.
Place a piece of cast iron to the surface of the work and reinforce if necessary. Some parts may require greater heating during brazing process, especially if large cracks and brazing process will take some time. Use an external heater to maintain the temperature of the piece.
Use a brazing torch to heat the surface of the cracks until they turn bright red. Touch the filler rod into the crack surface: the surface temperature must be hot enough to cause the filler rod material to flow into the gap. Use the torch to maintain the local temperature while walking down the crack.
Put the sand into the container repaired and completely covered with sand section. After brazing, the repaired cast iron should be cooled very slowly. If the part is left in the cold, can be cracked. Let the inside of the sand for at least one day, longer if a large part.
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