Hot upset riveting is a permanent forming and fastening process that uses precision heat and pressure to form hardened workpieces. This process achieves maximum hole-fill, creating a robust joint. Depending on the part requirements, the result can be a fixed or movable joint assembly.
Similar to electro-forging, hot upset riveting combines electrical current with pressure to form a boss or rivet to a desired diameter and shape. Under pressure applied by a power head, the workpiece becomes malleable due to current that flows to the joint and finished head. As the material cools, it contracts. Hot upset riveting uses the resistive heat and pressure to form the workpiece and not heat the base material, preventing the two from bonding.