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Heating & Riveting: Umbrella-Head Rivets for Ultra-Strong Joints
​The hot riveting process leverages thermal expansion and mechanical pressure to create an inseparable bond capable of withstanding immense shear forces.
​1. Induction Heating and Metal Plasticity
The rivet is heated until it reaches a glowing state (typically bright orange). In this stage, the steel's crystalline structure becomes plastic, allowing the material to deform easily under pressure without developing micro-cracks. As the hot rivet is inserted, the radiant heat slightly expands the hole, preparing for a molecular-level fit.
​2. Umbrella-Head Forming Technique
Using a hydraulic hammer or a specialized riveting machine, the tail of the rivet is compressed to form the distinctive "Umbrella-Head" shape. The umbrella design features a diameter significantly wider than the shank, distributing the load over a larger surface area. This not only secures the plates but also prevents material tearing at the connection point under high stress.
​3. Cooling Contraction: The Ultimate Clamping Force
The true secret of an "ultra-strong joint" lies in the cooling phase. As the temperature drops, the rivet begins to contract longitudinally. Since both ends (the pre-formed head and the newly created umbrella head) are locked against the surfaces, this contraction generates a massive clamping force, squeezing the metal plates together with absolute structural integrity. #Metalworking #worker