Spot welding may be the process of joining to metals by keeping the two metal surfaces in contact from the heat obtained from resistance to electric current. This really is a type of what we also call resistance welding. The two metals to be welded is held together in stress by electrodes via which electric current is passed. The name derives in the fact that a huge burst of electricity can be transferred to the weld spot for a extremely short duration of time thus welded the area but not heating up the rest of the metal entire body or surface.





The 3 points important here may be the Resistance in between the electrodes, the amplitude from the current and the duration of the current. Just as we regulate gas flow in a gas welding, we regulate these three points based about the type of metal to become welded to provide a proper and controlled heat. Various types of metal have different temperature at which they can be molded or welded perfectly. As well much heat may leave a hole and as well much less heat will not result in a great welding.











Spot welding works best on thin sheets of metal, what we call sheet metal, because of which it has a wide industrial application within the automobile industries. You must have observed it on discovery and other science channels. Those robots that you see within the automobile factory are mostly automated area welders. The robot welders spot weld the sheet metals that form the structure of the Car. Spot welding is also used in dentistry for area welding molar bands. Another use of this really is in the small battery industry where area welding is utilized for welding metal straps.





The Spot Welding Machines mainly consist of the holding tools and electrodes and an array of electrical equipments to pass and control electricity, such as a energy supply, an power storage unit, a switch and a welding transformer. The energy storage elements like a capacitor bank is used for passing a sudden huge burst of power, and the change is used to dump the stored energy to the transformer, which actions down the voltage and steps up the current. As electrical energy is passed via the weld spot and temperature rises the electrodes and the metal are conducting heat away. The goal would be to apply sufficient power so that a portion of the material inside the spot melts without causing the entire area to melt.











The voltage need for welding depends on the resistance from the metal to become welded and the sheet thickness. And because the resistance of a metal changes when it melts, the voltage that is passed to the metal require to become monitored in real-time and the voltage need to become adjusted accordingly in order to get a steady weld. Nowadays, such features are inbuilt in most of the spot welding machines





Another observation during a area welding operation is the magnetic field induced through the large electric current. These magnetic area interact with each other to create a large force area too, which drives the melted metal to move very fast. This is the observable difference between spot welding and other type of welding since we don't Usually provide sudden bursts of energy in the other Welding Apparatus . Another type of welding that uses very high frequency electric current is another type of plastic welding called also the High Frequency Plastic Welding for mostly producing forge welds.





Also, molten metal can be sparked out from the weld area and welder should maintain caution from burn hazards.