Spot Welding Electrodes -
Their Functions
(i) To conduct the welding current to the workpieces.
(ii) To transmit to the workpieces in the weld area the amount of force needed to produce a satisfactory weld.
(iii) To dissipate the heat from the weld zone and thus prevent surface fusion of the work.
Requirements of Spot Welding Electrodes
A spot welding electrode must
(i) Be a good conductor of electricity
(ii) Be a good conductor of heat
(iii) Have good mechanical strength and hardness at high temperatures.
(iv)Have a minimum tendency to combine with the metal being welded.
