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Non-Arc Welding Processes

Introduction. Non-Arc Welding Processes. Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials Resistance welding Oxy-Fuel Welding Friction welding (&Solid State) Laser and electron beam welding

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Non-Arc Welding Processes

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  1. Introduction Non-Arc Welding Processes • Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials • Resistance welding • Oxy-Fuel Welding • Friction welding (&Solid State) • Laser and electron beam welding • Brazing and soldering • Plastics joining • Adhesive bonding

  2. H H H H C=C H H -C-C- H H ··· ··· Welding of Plastics Joining Plastics • Polymer - a single building block (mer) is repeated to form a long chain molecule • Thermoplastic polymers soften when heated, harden when cooled • 2-liter bottles • Thermosetting polymers don’t soften when heated • Car tires, caulking compound (Poly)ethylene add H2O2

  3. Hot Plate, Hot Gas, Infrared • Advantages • Provide strong joints • Reliable • Used on difficult to join plastics • Limitations • Slow • Limited temperature range 0.1.1.2.5.T23.95.12

  4. Welding of Plastics Hot Plate, Infrared Welding Hot plate welding

  5. Welding of Plastics Hot Gas Welding • Thermoplastics (hotmelts) • Adhesive is heated until it softens, then hardens on cooling • Hot gas softens filler and base material • Filler is pulled or fed into the joint

  6. Vibration • Advantages • Speed • Used on many materials • Limitations • Size • Requires fixturing • Equipment costly 0.1.1.2.5.T24.95.12

  7. Ultrasonic • Advantages • Fast • Can spot or seam weld • Limitations • Equipment complex, many variables • Only use on small parts • Cannot weld all plastics 0.1.1.2.5.T25.95.12

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