Resistance welding is a welding technique used to join metals. It involves electric current being passed between two electrodes, creating heat at a defined spot, which results in bonding the materials together. Resistance welding, also known as spot welding, has become the welding method of choice for many metallic materials.
Resistance welding can be used for a variety of different metals, including steel, aluminum and bronze. Resistance welding is fast, efficient and strong. It does not require the use of expensive and dangerous welders and welding supplies, making it a great option for DIY projects.
Generally, resistance welding is done by placing two pieces of metal to be joined between two electrodes and applying pressure and an electric current. The electricity flows through the metal, and applies heat to the area where the metals touch. This creates a bond similar to that created in brazing, but is much stronger.
There are several different types of resistance welding techniques. Spot welding is the pinnacle of this welding process. Here, the current is applied to heat only a very small area, if done correctly, this limits the heat exposure thoughout the joint, ensuring that the material is not damaged. Top welding is also a common type of resistance welding. It uses a single electrode at the top of the joint, The roller seam welding technique is another variation of resistance welding. Here a roll electrode processes across the workpiece, applying heat throughout the seam.
Resistance welding procedures typically require the use of specialized equipment, like a welder or select plates. Some other common pieces of equipment which are needed for resistance welding are an electric rectifier, spot timer and electrodes. The welder transfers the electricity from the rectifier to the connection. The spot timer helps to regulate the current and the electrodes create the bond for the material.
While resistance welding can be completed with a wide range of materials, some of the most common materials used for resistance welding include stainless steel, aluminum, brass and copper. To ensure the success of resistance welding, all materials must be treated the same. They should have the same surface finish, cleanliness, and plating.
When used correctly, resistance welding can be an extremely reliable and efficient form of welding. It can create fast and strong bonds, and does not require a lot of expensive materials. However, it is important to remember that the results are only as good as the welding procedure itself, so should be done carefully and professionally.
