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Metalwork - Assembly - SolderingWhat is Soft Soldering ?Soft Soldering is a method of filling gaps or Permanently joining metals that will undergo only light stresses, at relatively low temperatures. The metals we are concerned about are Copper and Brass and the temperatures involved in Soft Soldering are generally below 400°C. A Filler metal, based on Tin, with a melting temperature lower than the metal pieces to be joined, is melted and allowed to flow into the joint, which on cooling hardens. Soldering is a bit like gluing but it differs in that there is a small bit alloying between the metals to be joined and the solder at the surfaces that come into contact with eachother. When Soldering is done well it also provides a water and gas seal at the joint. Other similar permantent joining methods are Brazing and Welding. Brazing involves higher temperatures than Soft Soldering and is used where a much stronger joint is required. Brass is used as the basis of the filler material. In Metalwork it is genarally used to join Steel. Brazing temperatures require the use of an Oxy-Acetylene Torch. (Brazing will be covered on another page at a later date.) Finally there is Welding. With Soft Soldering and Brazing there is no melting of the base metal. With Welding the base metal is melted and a filler metal may be used to add further strength to the joint. Welding is used where a high strength joint is required. (Welding is not on the Junior Cert. course). Soft Soldering has two main purposes are far as you are concerned at this stage. To join pieces of sheet metal or to join electrical components. We only deal with Soldering of sheet metal here on this page and electrical soldering will be dealt with at a later stage on another page. Health & SafetyAs with a lot of processes in the Metalwork room, Health and Safety is very important. Soldering requires the use of heat up to 400°C and so heat / fire resistant gloves are a must to prevent accidental burning. If possible it would also be good to wear overalls of some description to protect your clothes.
![]() ![]() ![]() ![]() Main ToolsThere are many different ways to solder, depending on what you are trying to join and how you like to go about it. Below are some of the main tools you will probably use. Soldering Irons
Soldering Stove
Gas TorchThe Gas Torch can also be used in Soldering, either as the heater of the Soldering Irons above or as the actual applier of heat to the parts to be soldered together.
Using the Gas Torch without the Soldering Irons takes a bit of skill to get the temperatures of the parts to be soldered right. Don't heat the joint first, rather heat away from the joint so that the part holds some of the heat. When soldering a Lap Joint, (more below), a Gas Torch comes in very handy as it is an easier method to get the heat to the solder than using Soldering Irons. Remember, when lighting a Gas Torch make sure it is pointing away from you or anyone else. Fire treated without respect can lead to you having a bad day. Eelectric Soldering Irons
They are very similar to the Soldering Irons used in electronics works but they are a lot larger and more powerful, usually in the 100s of Watts range. What tools you use when soldering will be determined by the work you are doing and your own style. Each has advantages over the other types depending on the situation and your skill. With practice, effort and thinking you should become quite good at using all types. Soldering ExercisesSimple Box |
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