Welding, brazing, and soldering are all methods of joining two pieces of metal together. Each method has its own advantages and disadvantages, so it's important to choose the right one for your project.
Welding is the most permanent way to join two pieces of metal. A welding machine uses heat and pressure to fuse the metals together. This makes a very strong joint that can withstand a lot of stress. However, welding is also the most expensive and difficult method to learn.
Brazing is similar to welding, but instead of using heat and pressure to fuse the metals together, a filler metal is used. The filler metal melts at a lower temperature than the base metals, so it can be used to join them without damaging them. Brazing is often used when welding isn't possible or practical, such as when joining dissimilar metals or delicate materials.
Soldering is another way to join two pieces of metal together using a filler metal. However, unlike brazing, soldering only creates a temporary bond between the metals. The filler metal used in soldering melts at an even lower temperature than the filler metal used in brazing, so it's ideal for joining delicate materials or electronics components. Soldered joints are not as strong as welded or brazed joints, but they can be easily undone if necessary