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6.2 Spot-welding with the tongs
Caution:
Electromagnetic fields!
Wear protective goggles and gloves!
Electrodes heat up!
Flying sparks!
– Switch on unit with mains switch (66).
– Connect unit to the compressed air supply.
Ensure sufficient compressed air pressure, operating
pressure is 8 bar! If necessary, adjust pressure with the
filter pressure reducer (65). Insufficient compressed air
will lead to excessive splatter and the weld spot may
burn out.
When the spot-welding tongs have been connected, the unit
will switch automatically to the “tongs” symbol.
In the case of uncoded tongs, select the “tong spot-welding”
function with the program key AB, set sheet thickness with
key EF; if necessary fine-adjust with key GH, e. g. galvanized
sheets +, stainless steel sheets –.
During welding procedures, keep hold of button of the tongs
until welding process is automatically cut-off.
Sequence of the welding program (see diagram on LHS):
A – Pre-pressing 0.75 sec
C – Welding with automatic timer-setting 0.03 to 0.45 sec
E – Re-pressing 0.5 sec.
Releasing key (28) prematurely will interrupt the
functions “Pre-pressing” and “Welding”. Continued
pressure on key (28) can extend the function “Re-press”.
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