ESAB Aristo Mig 4001i, Instruction Manual, Page: 13 / 26

5 OPERATION
0460 740 001 - 13 - © ESAB AB 2017
If the mains power supply should be interrupted while welding is in progress, and then be
restored, the power unit will remain de-energised until the switch is again turned manually to
the ”START” position.
Turn the unit off by turning the switch to the ”0” position.
Whether the mains power supply is interrupted or the power unit is switched off in the normal
manner, welding data will be stored so that it is available next time the unit is started.
5.4 Fan control
The power source has a time control that means that the fans continue to run for 6.5 minutes
after welding has stopped, and the unit switches to energy-saving mode. The fans start again
when welding restarts.
The fans run at reduced speed for welding currents up to 144 A, and at full speed for higher
currents.
5.5 Overheating protection
The welding power source has overheating protection that operates if the temperature
becomes too high. When this occurs the welding current is interrupted and a fault code is
displayed on the control panel.
The overheating protection resets automatically when the temperature has fallen.
5.6 MIG/MAG and FCAW-S welding
An arc melts a continuously supplied wire. The weld pool is protected by shielding gas.
For MIG/MAG and FCAW-S welding, the power source is supplemented with:
• wire feed unit
• welding torch
• connection cable between power source and wire feed unit
• gas bottle
To ensure problem-free operation, the installation height from the cooling unit to the welding
torch must be max. 7 m. Heights in excess of this can cause problems, such as long starting
times, air bubbles, vacuums, etc.
If an installation height in excess of 7 m is required, we recommend an installation kit
comprising a non-return valve and a solenoid valve, refer to chapter "ACCESSORIES". Once
these valves have been installed, the hose package must be horizontal during the initial
startup so that everything fills with water. Then raise the wire feed unit and hose package to
the high height. Continued safe operation at installation heights of up to 12 m can now
commence.
5.7 TIG welding
TIG welding melts the metal of the workpiece, using an arc struck from a tungsten electrode,
which does not itself melt. The weld pool and the electrode are protected by shielding gas.
For TIG welding, the welding power source is supplemented with:
• a TIG torch with gas valve
• an argon gas tube
• an argon gas regulator
• tungsten electrode