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Soldering is the process of securing metal joints and electrical components to create stable joints. There are two methods of soldering items: soft and hard soldering. Soft soldering involves joining metal pieces using filler material called Eutectic Tin/Lead Alloy. It is ideal for joining delicate parts that get damaged at high temperatures.
This type of solder is used because it melts at a relatively low temperature, i.e., 250-650 degrees Fahrenheit. Hard soldering, however, uses a different alloy that melts at a high temperature and uses a torch that generates more heat than the ordinary propane torch.
As such, soft soldering is ideal for a range of metals, including brass, lead, copper, tin, cast iron, and aluminum. For this text, we look at how to solder cast iron parts.
Use the isopropyl solvent to clean the cast iron workpiece. If the component has oil or grease, use a rag to wipe it clean.
It is essential to clean the component before soldering to prevent the metal from forming an extra coat of oxide. You may also need to paint the metal piece using a thin layer of liquid flux to avoid oxidation and to improve the flow of the solder.
Be sure to wear safety glasses and heat-resistant gloves before you embark on the process. Then, heat the fluxed cast iron pieces using a propane torch until it gets heated up. Then scrub the component again and apply another layer of flux.
Place the cast-iron workpiece in the desired position and clamp the pieces together. Then, heat a small amount of solder at the tip and apply it to the seam running it between the metal pieces once it starts melting.
Light up the propane torch to heat the cast-iron piece directing the flame’s blue cone toward the metallic part. Be sure to move the iron around the area surrounding the seam until the solder has changed color and filled the seam. You should, however, avoid heating the solder directly. Then, allow the cast iron pieces to cool before unclamping them.
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