Current Welding Technique

• A spot welder works using an electrical current to form a bond between two metal sheets. The whole concept is based around the "spot" or centralized area where the weld is formed. An electrical current is fed through two electrodes and into a very small area on two pieces of metal. The pieces of metal are clamped together. When the current is applied in one particular "spot" it melts the metal and forces the two sheets to bond in that spot.
  
  

Parts of a Spot Welder

• A spot welder generally has just a few parts. These include the electrodes which are most commonly made of an alloy metal like copper or silver. These electrodes need to be clamped onto a sheet of metal to apply the current. This is done by handlers or tool holds which position the electrodes. These could be very long arms that are attached to a machine or robot which can move the electrodes around a surface. The other thing a spot welder has is a coolant. This is usually water or some other kind of mixture depending on the application. Since a spot welder generates a lot of energy it creates a lot of heat and therefore needs coolant.
  
  

How they Are Used

• Spot welders are used for bonding many products we use every day like sheet pans, galvanized garden buckets, shovels and other items. They generally are used for welding very thin sheets of metal which would not be able to withstand the heat from traditional gas welding. The benefit of a spot welder is speed and precision. When you spot weld two metal sheets together, heat is only applied to a very small area so the metal is not weakened or damaged.