Pressure Or Welding Force
The pressure exerted by the tongs and the electrode tips on the
workpiece has a great effect on the amount of weld current that flows
through the joint. The greater the pressure, the higher the welding
current value will be, within the capacity of the resistance spot welding
machine.
Setting pressure is relatively easy. Normally, samples of material to be
welded are placed between the electrode tips and checked for adequate
pressure to make the weld. If more or less pressure is required, the
operating manual for the resistance spot welding machine will give
explicit directions for making the correct setting. As part of the equipment
set-up, the tong and electrode tip travel should be adjusted to the
minimum required amount to prevent “hammering” the electrode tips and
tip holders.