pistehitsaus

Pistehitsaus, also known as resistance spot welding, is a fusion welding process where heat is generated by the electrical resistance of the workpiece. It is commonly used to join sheet metal parts. The process involves passing a large electrical current through the workpieces, which are held together under pressure by a pair of copper electrodes. The resistance to the current flow at the interface between the sheets causes localized heating, melting the metal and forming a nugget. As the current is switched off and the electrodes continue to apply pressure, the molten metal cools and solidifies, creating a strong weld.

Pistehitsaus is characterized by its speed and efficiency, making it suitable for high-volume production environments. The equipment required is relatively simple, typically consisting of a transformer, electrodes, and a clamping mechanism. The process is highly repeatable, and the resulting welds are generally of good quality. However, it is primarily limited to joining overlapping sheet metal components and can be difficult to apply to thicker materials or materials with poor electrical conductivity. The visual appearance of a spot weld is a small, circular indentation on both sides of the joined material. Applications for pistehitsaus are widespread, including automotive manufacturing, aerospace, and appliance production.