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Specification
Type :
Air operated stationary press type Spot/Projection welders with
pneumatic cylinder mounted directly on the upper arm.
Construction :
Robust construction, streamlined appearance with maximum resistance
to deflection. Transformer enclosed in the main frame and pneumatic
accessories mounted on the side of the machine and upper and lower
arms mounted directly on to the body. Operating control station
mounted on the machine clearly visible and within easy reach of
the operator.
Welding Transformer :
Transformer conforms to IS:4804 Part-I and RWMA Standards, water
cooled, class 'F' insulation with thermoswitch protection for overloading.
Current Control :
Welding current adjustable from 50 to 100% by means of a tap switch.
Cooling System :
Transformer, Electrode holders, welding electrodes and thyristors
are water cooled.
Electrodes / Dies Toolings :
Machine can be provided with custom-designed spot welding electrodes
/ projection welding dies to suit the individual application, and
suitable jigs and fixtures for holding, guiding and indexing of
the work-piece as required at extra cost.
Electrode Control System :
The upper electrode actuated by a heavy duty 2-way cushioned pneumatic
cylinder controlled by an electrically operated 4-way solenoid valve.
Compressed air at 1.5 Kg/cm2 - 5.6 kg/cm2 (20 to 80 psi) acting
on the pneumatic cylinder provides electrode force.
Machine provided with air filter, air lubricator, air pressure regulating
valve, air pressure gauge.
Adjustment of Electrode Force :
By air pressure regulating valve provided on the machine.
Adjustment of Electrode Stroke :
By vertical adjustment of lower arm / platen.
Weld Initiation :
By means of operator's foot-switch connected to low voltage safe
initiating circuit.
Control :
Control model ME-201, C MOS integrated circuits based. Fully synchronous
weld parameter is incorporated with the machine. The timers, slope
control, heat control and control station are housed in a 19"
Euro chassis with plug-in cards mounted on the side of the machine.
The total box can be disconnected by removing a single plug.
Timers :
Squeeze, weld, hold and off time of 1-99 cycles +/- zero cycle in
steps of 1 cycle to provide accurate timings.
Heat Control :
The phase shift firing of thyristors enables smooth and continues
adjustment of welding current from 10 to 100%.
Slope Control :
Facility of "Soft Start" and gradually rise of current
during initial period of 1 to 9 cycles is provided and is adjustable
in steps of 1 cycle.
Power Thyristor Switch Assembly :
A pair of water cooled Power Thyristors of adequate rating with
thermoswitch and surge protection devices are housed inside the
frame of the machine.
Indicators :
LED indicators provided in the front panel displays the operation
sequence and also helps quick and easy location of faults.
Service Requirements
Power Supply :
415 V, single phase, 50 cycles, Machine suitable for connection
to 2 lines of 3 phase supply. Main supply cables 2-core type. Disconnect
switch fuses of recommended size to be provided by the customer.
Compressed Air :
Customer to provide air supply at recommended flow volume at a minimum
pressure of 5.6 kg/cm.sq. (80 p.s.i.).
Cooling Water :
Cooling water at minimum 2.1 kg/cm.sq. pressure and temperature
below 30oC at recommended flow rate to be provided by the customer.
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