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Resistance welding spot welding

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Resistance welding spot welding

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  1. Resistive Spot Welding is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current

  2. Spot Welding • Welding cycle: • Electrodes contact the metal (pressure is applied) Known as squeeze time • Current is passed between electrodes the temperature increases at the contact point the metals melt- the electrodes squeeze the material- • Weld time: • Current is shut –down pressure increased- hold time pressure is released- off time weld nugget is formed

  3. Parts Of The Machine

  4. Working Principle H = I2RT I – Current R – Resistance of the conductor T – Time of current flow

  5. Quick and Easy • No need of Flux and Filler metals • Multiple sheets joined together at the same time • No dangerous open flames • Saves production cost • Dimensional Accuracy ADVANTAGES

  6. LIMITATIONS • Difficulty for maintenance or repair • Generally have higher cost than most arc welding equipment • Low tensile and fatigue strength • The full strength of the sheet cannot prevail across a spot welded joint

  7. APPLICATIONS Automobile industry Dental Prosthesis Batteries Nuts and Bolts

  8. Spot welding in Aircraft

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