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11
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and/or seek training on the subject.
Use of an anti-spatter spray Draper stock No.05709 will
help to achieve a cleaner finished weld. This welding
power source has a maximum material thickness
capability of 5mm.
8.7 THERMAL CUT-OUT
If welding for extended periods the thermal cut-out will
activate prohibiting use of the machine until sufficiently
cool.
ATTENTION: After completion of any welding task leave
the unit connected to the power supply for a sufficient
period to allow the cooling fan to continue working.
8.9 DEFINITION:
DUTY CYCLE:
Duty Cycle is a percentage of 10 mins. in which a
machine can operate at a rated load without overheating
and interruption from the thermal cut-out device.
Example: 150A @ 30% Duty factor
150A welding for 3 minutes
7 minutes down time
Example: 95A @ 100% Duty factor
95A continuous welding
To increase the operation time, reduce the amperage.
Note: The heating tests have been carried out at
ambient temperature and the duty cycle (duty factor) at
20°C has been determined by simulation
Definition:
ARC WELDING:
Fusion welding in which heat for welding is obtained
from an electric arc.
Definition:
MANUAL METAL ARC (MMA welding):
Also known as SMAW (Shielded metal arc welding).
Metal-arc welding† with straight covered electrodes of a
suitable length and applied by the operator without
automatic or semi-automatic means of replacement. No
protection in the form of gas from a separate source is
applied to the arc or molten pool during welding.
†Arc welding using a consumable electrode.
Definition:
METAL INERT-GAS (MIG welding)
Also known as GMAW (Gas metal arc welding)
A welding process in which an electric arc forms
between a consumable wire electrode and the
workpiece metal(s), which heats the workpiece metal(s),
causing them to melt, and join. Along with the wire
electrode, a shielding gas feeds through the welding
gun, which shields the process from contaminants in the
air.
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