Welding, soldering and brazing are metal joining processes. Each type of joining process has its own significance. The type of joining process to be applied for joining two parts depends on many factors. The tabular comparison tells us the differences between the join…

Different types of welded joints bring two parts together for joining. Five types of welded joints are butt joint, corner joint, lap joint, T-joint, and edge joint. 1. Butt joint: In Butt welded type, the parts lie in the same plane and are joined at their edges. …

Several welding processes are available; however, their application is dictated by the mechanical properties , type of welded joints , the quality required in the service condition, cost, and availability of the machine and operator’s skill.   The discussion below give…

Electrogas welding (EGW) is a vertically positioned arc welding process, is used for welding the edges of sections vertically and in one pass, with the pieces placed edge to edge (butt joint). It is classified as a machine-welding process because its operation require…

The process of welding and cutting metals involves the application of high heat energy to the objects being welded or cut. This high amount of heat energy for the welding process is obtained from the use of inflammable gases (such as acetylene, hydrogen, etc.) or elec…

Thermit welding  is the joining process in which the heat required for the melting and joining of components is obtained due to the exothermic chemical reaction.  When ignition powder is initiated using the matchbox, the heat generated due to the burning of the ignitin…

Gas Metal Arc Welding (GMAW) is also known as metal inert gas (MIG) welding. In this process, the weld area is shielded by an inert atmosphere of argon, helium, carbon dioxide, or other gas mixtures. A wire-feed drive motor automatically feeds the consumable bare wire…

The operator beginning his career in operating arc welding machines must go through and become familiar with these general safety recommendations to avoid accidents and injuries. Safety recommendations while working with arc welding processes such as flux-cored arc w…

Plasma Arc Welding (PAW) is an arc welding process; an entire plasma arc is produced and directed toward the weld area. The arc is stable and reaches temperatures as high as 33,000°C. A plasma is a scorching ionized gas composed of nearly the same number of electrons …

Gas Tungsten Arc Welding (GTAW), also known as TIG (Tungsten Inert Gas) welding , the filler metal is supplied from a filler wire as shown in the figure below. The tungsten electrode is not used during this welding operation; a constant and stable arc gap is maintaine…

The flux-cored arc welding process (FCAW) shown in the image below is similar to Gas Metal-arc Welding , except that the electrode is tubular in shape and filled with flux. Cored electrodes produce a more stable arc, improve weld contour, and improve the mechanical pr…

In Submerged-arc Welding (SAW ), the welding arc is shielded by a granular flux of lime, silica, manganese oxide, calcium fluoride, and other compounds. Gravity flow through a nozzle feeds The flux into the weld zone from a hopper. The thick layer of flux completely co…

Shielded Metal-arc Welding (SMAW) is the simplest and is used for many joining processes. More than 50% of industrial and maintenance welding is currently performed by this process. In this welding operation, an electric arc is generated by touching the tip of a coate…