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.
8.8 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.
– 11 –
9. TROUBLESHOOTING
9.1 TROUBLESHOOTING
WARNING: For your own safety, turn the switch off and remove the plug from the power supply socket.
PROBLEM
POSSIBLE CAUSE
REQUIRED ACTION
Wire not feeding despite
wire feed pulley turning.
Dirty current nozzle (contact tip).
Clean.
May be an obstruction at the
contact tip.
Remove obstruction.
Too low clamping pressure of the
wire feed pulley.
Increase the clamping pressure.
Interrupted or disruptive
wire supply.
Damaged current nozzle.
Replace.
Burnt current nozzle.
Replace.
Dirty driving gear torch liner.
Clean.
Cut on worn driving gear.
Replace.
Electric arc turned off.
Poor contact between earth
clamp and part to be welded.
Tighten the pliers and check them,
remove paint and rust.
Short circuit between current
nozzle and gas supply pipe.
Clean or replace the current and gas
nozzle, remove dirt, paint and rust.
Too loose current nozzle.
Tighten the current nozzle firmly.
Porous welded joint.
No gas, too little gas or wrong
gas.
Achieved via gas regulator flow
adjustment assuming gas bottle has
enough pressure.
Welder suddenly stops
working after longer
operation.
Welder has overheated due to
too long use and the thermal
protection has activated.
Let the welder cool down.
IMPORTANT: Please note all repairs/service should be carried out by a qualified person.
