What Is Welding?

The processes and technology of this manufacturing cornerstone explained Welding is a process in which metals and thermoplastics are joined together to produce an object or structure. These materials are commonly joined by the melting of a filler material, such as steel, at their boundary points, fusing them together. There are three main techniques: gas welding, arc welding and laser welding. Gas, or oxy-fuel, welding, is the most common type and also the oldest. This process works through the combustion of acetylene in an oxygen stream, with the gas funnelled to a point of focus (ie the welding stick – this can be a handheld or stationary robotic applicator), where it is ignited to produce a high-temperature fl ame. Gas welding produces a welding f l ame of 3,100°C (5,612°F) and, as such, is typically used to weld high-alloy steels. However, the f l ame produced in a gas-based system is typically less concentrated than other methods, leading to greater weld distortion. Arc welding differs to gas welding signifi cantly. This technique involves melting the work materials through an electrical arc. This is generated by attaching a grounding wire to the welding material and then placing another electrode lead against it, itself attached to an AC/DC power supply. When the electrode lead is drawn away from the materials it generates an electrical arc (an ongoing plasma discharge caused by the electrical breakdown of gas), which through its expelled heat, fuses the materials. Unlike gas welding, arc welding produces a more concentrated weld point. Finally, laser welding – which is one of the newest forms of welding – uses a high-energy beam to meld materials. As the laser has a high- energy density, this technique can achieve a deep penetration and incredibly focused weld, with little surrounding distortion. Due to this, laser welding is commonly used in large industrial applications, where speed and finesse are of great importance.

how is welding done,at what temperature is is welding done at,what is welding matterial

Welding at process