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14 cards from this deck
Electrical current encounters resistance in materials
P=I2RP = I^2RP=I2R (power = current squared × resistance)
Individual weld points between overlapping metal sheets
Copper
Excellent electrical conductivity & heat dissipation
None (no flux, filler rods, or shielding gases)
Minimal sparks or fumes
Automotive industry
Thin gauge materials
Continuous welds (instead of individual spots)
Rotating wheel electrodes
Leak-tight joints (fuel tanks, containers)
High voltage (safety hazard) & insufficient current for heating
High currents (thousands of amperes), low voltage (<10V)
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