Tweco 281 Thermal Arc Fabricator - Manual (Page 19)

FABRICATOR 281
April 10, 2006 2-3
2.07 User Responsibility
This equipment will perform as per the information
contained herein when installed, operated, maintained and
repaired in accordance with the instructions provided. This
equipment must be checked periodically. Defective
equipment (including welding leads) should not be used.
Parts that are broken, missing, plainly worn, distorted or
contaminated, should be replaced immediately. Should
such repairs or replacements become necessary, it is
recommended that such repairs be carried out by
appropriately qualified persons approved by Thermal Arc
Advice in this regard can be obtained by contacting
Thermal Arc.
This equipment or any of its parts should not be altered
from standard specification without prior written approval
of Thermal Arc. The purchaser of this equipment shall
have the sole responsibility for any malfunction which
results from improper use or unauthorized modification
from standard specification, faulty maintenance, damage
or improper repair by anyone other than appropriately
qualified persons approved by Thermal Arc.
2.09 Specifications
Gun Catalog Number 43340P
Gun Type TWECO Weldskill 300 Amp
Gun Cable Length 15 ft (4.5m)
MIG Gun Specifications
Table 2-2: MIG Gun Specifications
Control Circuit Supply
Wire Motor Supply
Wire Diameter
.023"
(0.6mm)
.030"
(0.8mm)
.035"
(0.9mm)
.045"
(1.2mm)
1/16"
(1.6mm)
Mild Steel: Y Y Y Y
Stainless Steel: Y Y Y Y
Aluminum: Y Y Y Y
Flux Cored: Y Y Y Y
Wire Spool Size Capacity
80 to 800 ipm
(2 to 20 m/min)
44 lb, 33 lb, 10 lb, 8" and 12" wire spool sizes.
Wire Drive Specifications
Wire Speed Range
30VA @ 24VAC
216VA @ 36VAC
Table 2-3: Wire Drive Specifications
2.08 Duty Cycle
The rated duty cycle of a welding Power Supply is the
operating time it may be used at its rated output current
without exceeding the temperature limits of the insulation
of the component parts. To explain the ten minute duty
cycle period the following example is used. Suppose a
welding Power Supply is designed to operate at 50% duty
cycle, 250 amperes at 28 volts. This means that it has
been designed and built to provide the rated amperage
(250A) at the rated load voltage (28V), for 5.0 minutes
out of every 10 minute period (50% of 10 minutes is 5.0
minutes). During the other 5.0 minutes of the 10 minute
period the Power Supply must idle and be allowed to cool.
The thermal cutout will operate if the duty cycle is
exceeded.