An ancient technique used since the Bronze Age, welding is the most efficient and economical way to join metals. Welding is essentially a fabrication process and probably the only way by which two or more metal pieces can be bonded together by heating them to their melting points, by using or not making use of pressure and with or without using a filler metal. The process of welding metallurgically joins two metals to produce one single piece. The joint produced by welding is a permanent joint and is much stronger than any other method of joining metals.
The Welding Process
Welding can be done in several ways and there are different types of welds. While some welding processes produce plenty of heat and sparks, other kinds of welding do not even need extra heat. Welding can be carried out anywhere, be it indoors, outdoors or even underwater. Welding is used in several industries such as construction, oil, automotive, mining, etc.
Kinds of Welding Processes
There are many welding processes, which can be categorised depending on the energy source used and the state of the metal at the point where it is being welded. Some of the various welding methods are – arc welding, spot welding, metal inert gas welding (MIG), gas metal arc welding, gas welding, etc.
The joint produced by the process of welding must be able to withstand all kinds of pressure and forces that it encounters during its life, which means that the joint design is determined by the magnitude and type of load that is expected to act on the weld. Some of the joints that are used for welding are T-joint, edge joint, butt joint and lap joint.
Process of Welding
The type of welding process mainly depends on the type of material and the kind of joint to be made. Welding processes can be categorised into – pressure welding and fusion welding.
This welding process is when the welded joints are produced when external pressure is applied at temperatures that are above the melting point, in which case the welding is known as fusion welding or the temperature is below the melting point, which is known as solid state welding.
Pressure welding is usually used on metals that are very ductile or the metals whose malleability increase with the increase in temperature. Some common types of pressure welding processes are – explosive welding, cold pressure welding, percussion welding, ultrasonic welding, friction welding, inertial welding and induction welding.
In this process of welding, the edge of the base metals is heated above their melting point to produce a joint. In this process, there is no external pressure needed and a metal filler may be used at times. The quality of the weld can be enhanced by using an inert gas and sometimes the gas is not required.
Today, the process of welding has evolved significantly and the process itself has become more sophisticated and advanced. The decision of the welding process to be used really depends on the industry where the welding is being done and the material to be welded. Using the proper welding method can indeed increase the efficiency and productivity of your fabrication business.