The main frame of the machine is of heavy rigidly re-inforced &
robust welded steel construction. It combines a compact streamlined
appearance with maximum resistance to mechanical deflection. The
welding transformer is enclosed in the main frame and is easily
accessible, for inspection.
STANDARD THROAT DEPTHS (mm) :
280, 460 & 600 (other throat available on request)
Normal Working Height :
WELDING TRANSFORMER :
Transformer of a special type, water cooled, having core of high
grade electrical steel, primary and secondary coils of solid
electrolytic copper of ample section, heavy duty class ‘F’
insulated, impregnated and tropicalised suitable for withstanding
continuous temperature of 140º C.
CURRENT CONTROL :
Transformer primary coils provided with taps brought out to tap
change links for adjustment for welding current in a 6 step from 50
to 100%. Tap change links are enclosed behind machine door and are
easily accessible for variation of welding heat.
COOLING SYSTEM :
Transformer, secondary connections, arms and electrode wheels are
water cooled. Internet water cooling piping with flow adjusting
values for each circuit and discharge to an open drain pot for
visual observation of flow are provided in the machine.
Circular disc type top and bottom welding Electrodes.
ELECTRODE CONTROL SYSTEM :
Upper electrode is actuated by hand lever to provide electrode
ELECTRONIC CONTROLS :
Seam welders are provided with solid-state electronic controls
housed in a well-designed sheet steel cabinet. The standard design
of the cabinet is suitable for mounting it on the sidewall of the
machine; floor mounting shall also be provided a request. The
control knobs and panel are elegantly arranged, provided maximum
convenience to the operator. The front panel is protected from
misuse by providing a transparent guard door. All internal wiring is
easily accessible for servicing. The circuit design is versatile
enough for almost all type of requirements and consists of the
WELD INITIATION :
- A squeeze time control to select the delay between initiation
of the foot switch and the start of the weld. Timing is
adjustable from 2-25 cycles, continuous
- Synchronous (digital) timing control of 1-9 cycles “ON”
and 0-9 cycles “OFF” both in steps of one
- Heat control circuit based on phase shifted firing of
thyristors which enable continuous adjustment of current between
10% to 100% of then value available from welding transformer.
- High power switches device consisting of 2 Thyristors
connected in inverse parallel mounted on water-cooled heatsinks.
The sizes of the thyristors are chosen to watch the KVA of the
transformer and the devices are of ample capacity to withstand
momentary overloads. Protection devices for high voltage surges
and a thermoswitch (for inhibiting the operation if the
temperature of the thyristor pad rises above a preset limit) are
- Hold time to provide a delay between stoppage of weld and
separation of electrode wheels. Range of adjustment is 1-9.
By means of operators foot switch connected to a low voltage safe
MOTOR DRIVE SYSTEM :
Machine can be supplied with either A.C. or D.C. motor drive system
as per customers choice.
- D.C. Motor driven system consists of an infinitely variable
speed, reversible D.C. Motor, variac, rectifier & protective
fuses system with reduction gear unit to provide stepless speed
- A.C. Motor driven system consists 3-phase induction motor
speed as constant.
: Machine shall be supplied with A.C. MOTOR DRIVE
SYSTEM AS STANDARD UNLESS SPECIFIED otherwise by the customer.
SERVICE REQUIREMENTS :
Customer to provide the following service facilities :-
POWER SUPPLY :
COMPRESSED AIR :
- 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
- For Motor : 415 V, 3 phase, 50 cycles or 230 V, single
phase, 50 cycles or 230 V, single phase, 50 cycles for D.C.
motor drive, depending on the drive system selected supply cable
1.5 sq. MM 4 core, TPIC switch fuse unit 500 V, 15 Amps, with
fuses of 5 Amps for D.C. motor Drive system.
Supply of air recommended flow volume at minimum pressure of 5.6
kg/cm2 (80 psi) by the customer.
TECHNICAL SPECIFICATIONS :