Make sure that the welding system is calibrated to be within 90 Newtons (20 lbs) of target. The force is determined by the air pressure provided into the weld gun air cylinder. A conversion factor is required to convert the air pressure in PSI or MPa into force in pouds or kilo newtons.

Some robot welding applications have robot controllers controlling the weld force. Others setups have the welding control having control of the welding force.