Welding

Welding is the joining together of materials (typically metals or thermoplastics), usually by a fusion process.
Most commonly, workpieces are welded by melting both of them and adding more molten metal or plastic to form a pool that cools to form a strong joint. The energy to form the joint between metal workpieces most often comes from a flame (e.g. oxy-acetylene) or an electric arc, but welding by laser beam, electron beam and friction processes is well established. Energy for fusion welding of thermoplastics typically comes from direct contact with a heated tool or a hot gas.

Welding differs from soldering and brazing in that enough heat is applied to melt the materials to be joined. Soldering uses solder, a lower-melting-point material.

Types of welding

• Arc Welding; see Manual metal arc welding
• Cold welding
• Electron beam welding
• Explosive welding
• Forge welding
• Friction welding
• Friction-stir welding (FSW)
• Fusion welding
• Gas welding
• Induction welding
• Laser welding
• Manual metal arc welding, or 'stick' welding
• Metal Inert/Active Gas welding (MIG/MAG)
• Plasma welding
• Plastic welding
• Spot welding
• Stud welding
• Submerged arc welding
• Thermite
• Tungsten inert gas welding (TIG)
• Ultrasonic welding

External link

• Welding robot (http://www.ironshop.com/press_060101.htm).

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