Welding, brazing and soldering are different techniques used to join multiple pieces of metal. It is also a useful practice to fill a gap between two metal parts for the strong joint. Here is an overview of the different techniques:
Welding
The welding method is most effective when the two metals joined are similar. For instance, it is not possible to weld steel to a piece of copper. Welding relies on a very high temperature to melt the parts. This type of joining process is very reliable and the joint can be just as strong as the two original pieces that have been combined together. In some situations it is possible to use a filler metal to improve on the all-round strength. But, it is essential to complete this work using the correct amount of heat. Using too much heat can lead to a weak weld and a change in the metal's properties. There are multiple welding methods, including stir friction, laser, electron beam, arc and metal inert gas. The welding process is also commonly used to cut through large metal structures simply by using heat to melt through.
Brazing
Brazing is a process of joining two metals using alloy filler. The two parts are joined by heating and melting the filler. Any filler used must have a lower melting point compared to the main metal pieces. This is a practical method for joining different types of metals, such as nickel, gold, copper, silver and aluminum. Also, the brazing process relies on flux to make it easier to join the parts. This is a type of lubricant that makes it easier for the filler to flow and fill the appropriate join. A further benefit is its ability to clean the part surfaces that are being bonded together. Brazing is not quite as strong as welding, but is still a very reliable choice for joining two different types of metals.
Soldering
Soldering is similar to blazing, but operates at a much lower temperature range. This method relatives on soldiers or fillers that are intended to melt at 450 ° C or below. There are plenty of metals that are easily soldered, including iron, brass, copper, silver and gold. Once the filler reaches the desired temperature to melt, it will quickly solidify to bond the metal parts. This type of joint does not have the strength of welding or brazing. The original solder was lead-based, but because of environmental concerns there are now safer alternatives.