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Specifications
Ratings KVA:
50, 75, 100 150, 200.
Construction:
Robust construction, streamlined appearance with maximum resistance
to deflection. Welding transformer enclosed in the main frame, pneumatic
control mounted on the machine.
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 change
links.
Cooling System:
Thyristors, Transformer, Secondary connections and electrode wheels
are water cooled.
Electrode Force:
Upper arm is actuated by heavy-duty 2-way pneumatic cylinder, controlled
by solenoid valve. Compressed air at 2.0 Kg/cm.sq. to 5.6 kg/cm.sq.
provides electrode force.
Air filter, lubricator, regulator, pressure gauge are provided
as standard accessories.
Electrode Drive:
Machines are provided with different drive system depending on the
application. Customer to specify the preferred system.
| 1) Direct Drive : |
Direct gear is given to any one of the wheels. |
| 2) Knurl Drive : |
One of the wheels or both are driven through a serrated hardened
wheel depending on the style of welding. Constant dressing of
weld wheel of maintain uniform profile, constant welding speed
irrespective of weld wheel diameter are some of the advantages
of knurl drive system. |
Narrow Track Seam Welding (Optional at
Additional Cost):
In order to weld coated sheets for application like fuel tank, machine
with narrow track welding (2.5 to 3 mm weld width) facility could
also be supplied. In narrow track seam welding, weld wheels are
of thickness 6 mm constantly coined for circular profile, which
results in narrow contact with very high-pressure density. Due to
this high-pressure density the coated material on the sheet metal
is squeezed out during the welding.
Motor Drive:
Machine will be supplied with drive system comprising AC squirrel
cage induction motor, DOL Starter, Reversing Switch, Mechanical
Speed Variator and Reduction GearBox as standard. Other types of
drives including DC drive on request.
Electronic Controls:
Fully solid state electronic controls suitable for mounting on the
side of the machine or independent floor mounting are supplied with
machine having the following facilities:
- A squeeze time control adjustable from 2-25 cycles to select
delay between initiation of the foot switch and the start of the
weld.
- Synchronous (digital) timing of 1-9 cycles 'ON' and 0-9 cycles
'OFF' both in steps of one cycle each for weld time.
- Phase shift heat control for firing the thyristors and to adjust
the welding current between 50 and 100% over and above the transformer
taps.
- High Power switching device consisting of 2 thyristors connected
in inverse parallel and mounted on a water cooled heat sinks.
Protective devices for high voltage surges and thermo-switches
are standard features.
- Hold time having a range of 2-25 cycles to provide a delay between
stoppage of weld and separation of weld wheels.
Microprocessor based Weld Control : (Optional
at Extra Cost)
Machine can be supplied with Microprocessor based control.
Service Requirements
Power Supply:
- For Transformer : 415 V, single phase, 50 cycles (suitable for
connection to 2 lines of 3 phase supply). Main supply cable for
transformer connection. Disconnect switch with fuses of recommended
rating.
- For Motor : 415 V, 3 phase, 50 cycle for A.C. Motor drive supply
cable 1.5 sq.mm. and 3 core, TPIC switch fuse unit 500 V, 15 Amps,
A.C. Motor Drive system.
Compressed Air:
Supply of air at recommended flow volume at a minimum pressure of
5.6 kg/cm.sq.
Cooling Water:
Clean water at minimum at 2.6 kg/cm.sq. pressure and temperature
below 30 degree centigrade at recommended flow rate.
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