Spot Welding Services
 | Resistance spot welding is a capability at Vista Industrial Products, Inc. Spot welding passes an electric current through the metal being welded. Resistance to the electrical flow heats the metal to welding temperature. The process is used to weld together two or more overlapping pieces. It is well-suited to automatic welding. Spot welding is commonly used to join brackets, cabinets, and other sheet metal assemblies. Spot Welding works by holding sheets of metal together with two copper alloy electrodes. The sheet metal used is generally about .020 to .12 in thickness. Thicker stock is more difficult to spot weld since the current has more surrounding metal to flow to. While the two copper electrodes hold the sheets together, a large electric current flows through the electrodes and melts the metal into a “spot”, and welds the two pieces together. |
The advantage of using spot welding is that it is quick since such a large amount of current is produced in a short time, and that it is very easy to control to produce reliable welds without the entire sheet being affected. The amount of current delivered to the spot is determined by the amplitude and duration of the current, along with the resistance between the copper electrodes. Based on the sheet metal’s material type, thickness, and the type of electrodes used, will help determine the right amount of current to utilize to create a spot weld. If there is not enough current applied to the sheet metal, then a poor weld will be produced since the metal will not melt. If there is too much current applied to the sheet metal, then the sheet metal will melt all the way through, creating a hole.
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