Section 16 Terminolo
96
Terminology
Term Description
Constant current Closed loop control of weld current resulting in the weld current being regulated to a
programmed value.
CT See Current transformer.
Current transformer A coil of wire wound on a circular core. This is used to measure the current in a cable
passing through the circular core. iPAK2 can use a CT to measure primary current.
Cool time The time between weld pulses.
Downslope A linear decrease in current from the Main heat value to a final value.
Downslope time Time taken for the welding current to decrease from the Main heat value to a final
value.
End of sequence An output that switches on as the electrodes open on completion of a weld. The
output indicates the end of the weld sequence.
EOS See End of sequence.
HAV Hi-lift Air Valve. See also Retract.
Heat A measure of power put into a phase angle controlled (non- constant current) weld.
The Heat relates directly to the firing angle on the mains voltage waveform.
Expressed as a percentage.
Hold The time between the last application of current and the electrodes opening. This
interval allows the molten material created by the weld process to solidify.
Hold time The time period following the last weld pulse prior to the electrodes opening. This
period allows the molten material to solidify.
IP address Internet Protocol address. A unique address used by devices on an Ethernet network.
Initiation signal The signal that starts the weld sequence. See also Start signal
k
Kilo amp (1000 amps).
kVA Unit of power (1000 volt amps).
mA Milliamp (1/1000 amp).
mV Millivolt (1/1000 volt).
Off time In a Repeated weld sequence this is the time between sequences.
PH
See Phase angle control.
Post-heat The application of current to prevent the weld cooling too quickly.
Pre-heat The application of current prior to welding for the purpose of burning through plating
or surface contamination.
Presqueeze The time interval in a weld sequence for the electrodes to close onto the work piece.
Primary current The current in the primary winding of the weld transformer which is the current drawn
from the mains whilst welding.
Program select A group of inputs representing the binary value of the weld program to be used.
Proportional valve A device for regulating air-line pressure. Controlled by 0 to10 V dc signal.
Pulsations The number of times the Main heat interval is repeated during the sequence.
Successive applications of Main heat are separated by Cool2 time.
Retract The electrodes have two open positions: fully open to move the weld gun to and from
the work piece, and a working position for welding.
Retract air valve For use on a gun where the electrodes can be opened and closed in two stages. This
is an electrically operated valve for admitting air to the air cylinder that controls the
electrode movement.
2nd stage A signal required to allow the weld sequence to proceed.
Secondary current The current in the secondary winding of the weld transformer which is the weld
current.
Squeeze The time interval in a weld sequence for the electrodes to exert full welding force on
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