About Welding

Welding is the most abundantly accepted physical process used to join materials, mostly metals or thermoplastics, with the help of the phenomenon coalescence. It is usually brought about by adding a filler material to the molten work pieces to get a pool of hot molten material. This is then cooled to obtain a very strong joint.

High pressures, accompanied with high temperatures are used to produce the weld. Welding is different from soldering and brazing, as they use lower melting point materials as fillers between the work pieces, rather than melting the work pieces themselves.

Welding can be brought about by many different energy sources such as a gas flame, a laser, an electric arc, an electron beam, ultrasound, friction, etc. There are various welding machines and welding equipments that are used for different types of welding. They employ different techniques and are used in different fields for different purposes.

• - Arc Welding Machine – This machine basically uses a welding power supply to generate an electric arc between the base material and an electrode to melt and fuse the work piece at the welding point. They apply intense heat to the metals at the point of joining, causing them to intermix. They can be operated on both AC and DC current and both consumable an d non-consumable electrodes. Arc Welding Machines are further classified into different types such as Carbon Arc Welding Machine, Gas Metal Arc Welding Machine, Gas Tungsten Arc Welder, Shielded Metal Arc Welder, Flux Cored Arc Welding Machine, Orbital / Tube Arc Welding Machine, Plasma Arc Welding Machine, Stud Arc Welding Machine, Submerged Arc Welding Machine, etc.
• - Resistance Welding Machine – Resistance Welding is a thermo elastic process and these machines use both electric current as well as mechanical pressure to generate a weld connecting the metal pieces. This process makes use of the resistance of the work pieces in addition to that of the electrodes to generate heat at the interface between them. Different types of Resistance Welding Machines are Spot Welding Machine, Inverter Welder, Projection Welding Machine, Seam Welding Machine, Flash Welding Machine, Upset Welding Machine, Percussion Welding Machine, High Frequency Resistance Welder, etc.
  
• - Fusion Welding machines – Fusion Welding is a process that makes use of fusion or a filler material to complete the weld. These machines employ this process to get the weld done. Different types of Fusion Welding Machines are Electron Beam Welding Machine, Hot Plate Welding Machine, Plastic Welding Machine, Laser Welding Machine, etc.
  
• - Solid-State Welding Machine – These machines produce fusion of the work pieces to be welded at temperatures much lower than their melting point without adding any filler material. The commonly uses Solid-State Welding Machine are Cold Welding Machine, Diffusion Welding Machine, Explosion Welding Machine, Forge Welding Machine, etc.
  
• - Induction Welding Machine – This machine is used to bring about Induction Welding which is a process that employs electromagnetic induction to generate heat and make the weld. This machine is very useful for the welding of plastics and other thermoplastic materials.