Brazing refers to the process of joining two or more metals by first melting and then flowing a filler metal into the joint. The most common method used is a brazing torch. Used mainly in specialized operations or for small products such as personal home use the brazing torch finds many useful applications.
History Of Torch Brazing
The brazing torch can be traced back to 1899 when John Harris invented the oxy-acetylene method of cutting. While he was busy researching the manufacture of synthetic rubies, John Harris accidentally cut the metal plate that was underneath the synthetic ruby
The inventor was quick to discover the usefulness that such a tool could have and so the first-ever fare cutting torch was born in the 100 years since then. It has been around the fame cutting torch, also known as the brazing torch, had revolutionized the way that we manufacture and work with metals.
Types Or Torch Brazing
Automatic torch brazing does not require any manual labor for the process. This is the most recent method of brazing, used mainly where high production volumes are required
The difference between machine torch brazing and automatic torch brazing is that in the latter there is no need for manual labor besides setting up and unloading the machine. Machine torch brazing is also used for medium-high volume, repetitive productions, and limits the need for manual labor.
Traditional manual torch brazing involves a handheld brazing torch mainly used in small production volumes. As opposed to the first two the drawbacks of this method are, of course, the high labor costs and slower output.
The process begins by making sure you have close-fitting parts, clean base metals, and an oxide-free surface. The key characteristic of the brazing process is the filler metal used to fill the joint. Fillers are usually made of a combination of at least 3 metals, chosen for their unique characteristics.
The key of these characteristics is having a lower melting point than the base metal so that it can be used to fill the joint without melting the base metal in the process. Common filler glides include Aluminum-silicon, as well as copper-silver, and brass.
The filler metal is heated above its melting point and with the protection of flux used to flow through the workpiece. This process is known as wetting. Once the filler alloy has flown between the joint, the piece is left to settle. The bond which is formed once cooled of very high quality and can last for many years.
What To Remember When Brazing
- Torch brazing uses extremely high temperatures to melt metals enough to cut through bone like butter) so be sure to use all recommended safety gear.
- Make sure you are using the correct brazing rod material for the metals used and that the torch used produces a high-intensity flame.
- Always remove the brazing torch from the fuel cylinder and ensure fuel is stored in an upright position once you have finished with the project.
- Brazing works best for strength, control, and flexibility. Make sure this fits what you are looking for on your current project
Finally, always research, or ask for help, where you are not sure. Ruining this process can destroy all the hard work you have already put into your project.