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Specifications
Standard Ratings:
50, 75, 100, 150, 250 and 300 KVA @ 50% duty cycle.
Type:
Air operated, stationary press type projection welding machine with
pneumatic cylinder mounted directly on the upper arm.
Construction:
Main frame of the machine is of heavy, rigidly reinforced welded
steel 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 the frame. Current is carried from the
upper transformer terminal to the upper platen tooling through a
'U' shaped laminated copper flexible link designed to provide rolling
action as the welding head reciprocates during operation. The welding
head is of antifriction type. The pneumatic controls mounted on
the side of the machine. The operating control station mounted on
the machine is clearly visible and within easy reach of the operator.
Standard Throat Depths:
300, 450, 750 mm.
Welding Transformer:
Transformer conforms to IS:4804 Part-I and RWMA Standards, water
cooled, class 'F' insulation with thermo switch protection for overloading.
Current Control:
Welding current adjustable from 50 to 100% by means of a tap change
links.
Cooling System:
Transformer, Bus Bars, Platens, Electrode and Thyristors are water
cooled, followed by discharge to an open drain-pot for visual observation
of flow.
Water Flow Switch (Optional at Extra Cost):
Water flow switches may be provided with the machine to ensure adequate
flow of the water for Transformer and Thyristor circuits while operating
the machine.
Platens:
Constructed from high quality copper alloy accurately machined,
having 'T' slots to international standards.
Dies Toolings:
Machine can be provided with custom-designed projection welding
dies to suit various sizes and shapes of work pieces, and suitable
jigs and fixtures for holding, guiding and indexing of the work
pieces, as required, at extra cost.
Electrode Control System:
Upper electrode actuated by a heavy duty 2-way cushioned pneumatic
cylinder controlled by an electrically operated solenoid valve.
Compressed air at 1.5 Kg/cm2 - 7.0 kg/cm2 (20 to 100 p.s.i.) acting
on the pneumatic cylinder provides electrode force. Machine provided
with air filter, air lubricator, air pressure regulating valve and
air pressure gauge.
High Lift Facility (Optional at Extra Cost):
"High Lift" (retractable upper electrode) facility shall be provided
by means of special cylinder. A hard/foot operated air valve causes
the upper electrode to lift to the top most position for easy introduction
of the job into the throat of the machine. The retraction as well
as the working stroke is adjustable within a range.
Dual Pressure System (Optional at Extra
Cost):
Dual pressure system shall be provided by means of 2 sets of regulating
and controlling devices and the necessary air circuits. Working
in conjunction with special control units, this facility would enable
application of a higher force on the job being welded at any point
during the weld cycle.
Air Reservoir (Optional at Extra Cost):
An air reservoir of suitable capacity shall be provided to minimise
pressure drop during welding.
Adjustment of Welding (Electrode) Force:
By adjusting the air pressure regulator provided on the machine.
Adjustment of Throat Gap:
By vertical adjustment of lower arm.
Weld Initiation:
By means of operator's foot switch / hand operated switch connected
to a low voltage safe initiating circuit.
Controls:
Appropriate Control will be incorporated with the machine as per
requirement.
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 with fuses of size recommended 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/cm2 (80 p.s.i.).
Cooling Water:
Cooling water at minimum 2.1 kg/cm2 pressure and temperature below
30oC at recommended flow rate to be provided by the customer.
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