Resistance Spot Welding (Leaving Cert Engineering): Flashcards
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Practise the cards
14 cards from this deck
How heat is generated in resistance welding
How heat is generated in resistance welding
Electrical current encounters resistance in materials
Formula for heat in resistance welding
Formula for heat in resistance welding
(power = current squared × resistance)
What resistance spot welding creates
What resistance spot welding creates
Individual weld points between overlapping metal sheets
Material used for spot welding electrodes
Material used for spot welding electrodes
Copper
Why copper is used for welding electrodes
Why copper is used for welding electrodes
Excellent electrical conductivity & heat dissipation
Consumables needed for resistance spot welding
Consumables needed for resistance spot welding
None (no flux, filler rods, or shielding gases)
Type of emissions from spot welding process
Type of emissions from spot welding process
Minimal sparks or fumes
Main industrial user of resistance spot welding
Main industrial user of resistance spot welding
Automotive industry
Material thickness suited for spot welding
Material thickness suited for spot welding
Thin gauge materials
Type of weld created by seam welding
Type of weld created by seam welding
Continuous welds (instead of individual spots)
Electrode type used in seam welding
Electrode type used in seam welding
Rotating wheel electrodes
Application suited for seam welding
Application suited for seam welding
Leak-tight joints (fuel tanks, containers)
Why 230V AC mains is unsuitable for spot welding
Why 230V AC mains is unsuitable for spot welding
High voltage (safety hazard) & insufficient current for heating
Typical electrical requirements for resistance welding
Typical electrical requirements for resistance welding
High currents (thousands of amperes), low voltage (<10V)