A general introduction to the welding process

Welding is a fabrication process used to join metal pieces or parts together by heating the surfaces to the point of melting

. Various energy sources can be used for the process, including gas flame, electric arc, laser, electron beam, friction and ultrasound. The process has been used from very older times for joining metals, but the techniques have been changing and advancing ever since. Different techniques used: Many different techniques have been used including arc, gas, resistance, laser beam, electron beam and lightning welding. Different techniques involving manual labor, to advanced automatic and semi-automatic methods are available. It can also be done in different environments like open air, closed room, under water and outer space. Wherever it is done, care is to be taken that proper precautionary conditions are followed. Proper helmets, gloves and jackets must be used. Arc welding-A boon to welders: It involves the use of electric current to join two metals. The electric current generates an arc of very high temperature which causes the metal to melt thereby facilitating welding. Different advancements have been made in the process making it even more reliable and easy. It is one of the most commonly used techniques because it is not much expensive and demands only less labor. Different types of arc welding include Shielded metal arc, Gas metal arc, Submerged arc, Flux-cored arc and Electroslag welding Aluminium welding: It is one of the difficult techniques because of the texture of aluminium. The metal surface must be clean and free of contaminations to ensure a pure joining. As the melting point of aluminium is very low, the welder must be fast and careful enough while being involved in the technique. Usually TIG welding process involving a tungsten electrode is most commonly used. Contaminations free welding: Metal inert gas or MIG welding, also known as gas metal arc welding is a semi-automatic or automatic process. This is a much quicker method when compared to the traditional techniques. Since an inert or semi-inert gas is used for shielding during the process, it produces a contamination free weld. Safety First-Welding Helmets: What comes to one's mind when he thinks of welding? Heat, gases, fire and bright light. So a person involved in it must be protected from all these. Helmets play a major role in this as it protects the persons head. It protects a person from heat, spark and ultraviolet light. The main vital organ which gets affected easily is the eyes. Chances of the cornea or the retina getting burnt off are high. The exposed skin also gets affected due to the emission of rays and gases. The helmet must be such that it covers the person's face, head and shoulder from burns. A standard helmet free of cracks and sutures must be selected as a damaged one does not serve the necessary purpose. Welding is being widely used in many different industries and if proper precautionary methods are being followed, a proper contaminations free weld can be made.

A general introduction to the welding process

By: Johnpeter

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