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Spot welding technology principle (below)
Spot welding is a type of resistance welding which is used to join metals by applying pressure and electrical current through electrodes to the parts being welded. It is an efficient, economical and widely used welding technique.
The spot welding process involves two copper alloy electrodes which are pressed against the parts that are being joined. When the spot welding machine is activated, current flows through the electrodes pressurized against the metals being joined, which causes localised heating and builds up weld strength. The size of the spot weld depends on the size of the electrodes, welding current and the welding time.
Spot welding can be used in many industrial applications, including: joining thin sheets of metal, securing rivet fixings and crimping components together. It is also used to assemble structural frames and components.
When spot welding, it is important that surfaces to be welded are clean and free from dirt and grease. The welds must be designed to ensure that the forces applied on the parts do not cause mechanical failure or distortion of the metals. The welds should be properly dimensioned and the welded areas should be checked for any cold material that has not been melted by the welding process.
Spot welding is highly efficient, with a high net welding rate and relatively low costs, making it an effective and economical welding method for high volume metal joining jobs. There is however, some limitations with spot welding, including; difficulty in welding metal parts which have galvanised or powder coating surfaces, as the surfaces must be cleaned in order to allow the electrical current to pass through the parts.
Spot welding is a versatile, fast and economical method of welding, which can be used in many industries. It can be used on thin sheets of metals, to build structural frames and components, to assemble riveting fixings and crimp components. Additionally, it is generally easier to manipulate, program and maintain than other welding techniques.
