Stick/MMA: Stick is arguably the best and most popular process when it comes to crack repair of common cast irons, especially where users have limited equipment and/or experience. Cast iron rods/electrodes are readily available in small qtys (or 'handy packs') which is ideal for one-off jobs.
If it is cast iron you can drill a small hole at each end of the the crack to relive the stress and stop the cracks migration. Then you can clean it throughly and repair the crack with Thermo Steel putty. It is very similar to JB weld but designed for high temp (1700 degrees +) applications.
Larger cracks in aluminum heads typically require TIG (Tungsten Inert Gas) welding. Larger cracks in cast iron heads can often be repaired by furnace welding or flame spray welding.
A cold weld compound, or metal epoxy putty, can be used to repair pipes, radiators and car parts such as exhaust pipes or crankcases. This type of metal adhesive is heat-resistant and can be used to bond stainless steel, aluminium, cast iron, PVC and zinc.
Yes, cracks in cast iron can be repaired by welding, brazing, or applying epoxy putty.
Pinhole leaks, cracks, and even some larger holes in cast iron can be patched using epoxy or a combination of epoxy and waterproof repair tape, depending on the severity of the damage.
Cast iron is difficult, but not impossible, to weld. In most cases, welding on cast iron involves repairs to castings, not joining casting to other members. The repairs may be made in the foundry where the castings are produced, or may be made to repair casting defects that are discovered after the part is machined.
The more you use a rusted pan, the more iron you'll consume in your food. It's best to avoid cooking with a rusty cast iron pan. If it's reached the point of corrosion or deep rust, throw it away rather than risk your and your family's health.
Keep It Seasoned
Seasoning cast iron is an easy process which makes it different from other pans. You season it once and it's good for decades.
Avoid acidic foods and super high heat
Your cast iron can withstand heat - a lot of heat. A cast-iron skillet can withstand heats of up to 1500°F, which is much hotter than your oven could ever be. The seasoning will only burn off at about 800°F, so don't worry that you will damage your pan by cooking with high heat.
JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials.
Please note that it is NOT safe to use a cracked stove! Even minor cracks increase the risk of electrocution. You may be able to replace the glass-ceramic surface for minor cracks, but larger cracks will require a whole new cooktop.
CrackSeal Sealant is moisture-curing pipe sealant which seals cracks and splits in cast iron waste, drain and soil pipes where water is not leaking through. It can also be used on other materials where pressure is off, including steel and concrete lined pipework.
Shielded, high performance sewer repair couplings connect similar and dissimilar pipe materials and sizes in Clay, Cast Iron, Oversize Cast Iron, Extended Cast Iron, Schedule 40 Plastic, Thinwall Plastic, Ductile Iron, Asbestos Cement or Concrete pipe.
All categories of cast iron except white iron are considered as weldable, although the welding can be significantly more difficult compared with carbon steel welding. However, it can be difficult to tell the difference between these different types of cast iron without detailed metallurgical analysis.
If cast iron is left in the sink to soak, put in the dishwasher, or allowed to air dry, it will rust. It can also happen when you store your cookware in moisture-prone environments, such as a cabinet near a dishwasher, an open cabinet in a humid location, or stored outside.
This is because cast iron has a high percentage of carbon and contains microscopic graphite flakes that can develop into cracks under certain circumstances. Typical causes of damage to cast iron are: Thermal Stress – severe overheating or sudden changes in temperature.
Whether it's clay or cast iron, wood stove repair is entirely possible. Right now it's a safety hazard, but with some relatively quick fixes, you can have that wood stove all fired up again to heat your home.
You may be able to grind it to a bevel carefully and weld it with a high nickel alloy filler, specifically for cast iron with a slow preheat (300-350 degrees F) and slow post heat. Depending on the quality of the iron, and how clean you can get the metal it may weld up fine.
Technical and trade information. Braze welding has advantages over oxy welding in that the consumable melts at a lower temperature than the cast iron. This allows lower preheat (320-400°C). As with other forms of welding the surface must be properly cleaned so that carbon doesn't contaminate the weld deposit.
I have actually used JB Weld (the standard stuff) on a cast-iron sewer pipe repair, and it worked very well. The trick is to heat the repair a bit after applying the JB Weld; the heat will make it flow right into the crack. Looks good too.