Resistance Welding (Leaving Cert Engineering): Flashcards
📚Flashcards
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Practise the cards
15 cards from this deck
Principle of resistance welding
Principle of resistance welding
Heat builds when current meets resistance in material
Heat generation formula in resistance welding
Heat generation formula in resistance welding
What resistance spot welding creates
What resistance spot welding creates
Individual weld points between metal sheets
Material used for spot welding electrodes
Material used for spot welding electrodes
Copper
Why copper used for electrodes
Why copper used for electrodes
Excellent conductivity & heat dissipation properties
Speed of spot welding process
Speed of spot welding process
Fractions of a second
Consumables needed for spot welding
Consumables needed for spot welding
None - no flux, filler rods, or shielding gases
Cleanliness benefit of spot welding
Cleanliness benefit of spot welding
Minimal sparks or fumes produced
Primary industry using spot welding extensively
Primary industry using spot welding extensively
Automotive industry
Type of materials spot welding excels at
Type of materials spot welding excels at
Thin gauge materials
How seam welding differs from spot welding
How seam welding differs from spot welding
Creates continuous welds instead of individual spots
Electrode type used in seam welding
Electrode type used in seam welding
Rotating wheel electrodes
Applications suited to seam welding
Applications suited to seam welding
Leak-tight joints like fuel tanks & containers
Why standard mains electricity (230V AC) unsuitable for resistance welding
Why standard mains electricity (230V AC) unsuitable for resistance welding
Creates safety hazards & low current limits heat generation
Equipment to convert mains power for welding
Equipment to convert mains power for welding
Step-down transformers and rectifiers