ESAB ES 300i, Инструкция по эксплуатации, Страница: 18 / 44

5 OPERATION
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© ESAB AB 2017
NOTE!
When connecting a gas hose to the gas supply input, it must be secured using a
hose clamp.
NOTE!
Always use the cover when the USB connection is not in use.
5.3 TIG welding
TIG welding melts the metal of the workpiece, using an arc initiated from a
non-consuming tungsten electrode. The weld pool and electrode are protected
by a shielding gas that usually consists of an inert gas.
For TIG welding, the welding power source shall be supplemented with:
• a TIG torch
• a gas hose connected to the gas supply input (using a hose clamp)
• an argon gas cylinder
• an argon gas regulator
• a tungsten electrode
• a return cable (with clamp)
5.4 MMA welding
MMA welding may also be referred to as welding with covered electrodes. The
arc melts the electrode as well as a local part of the workpiece. The coverage,
when melting, forms a protective slag and creates a shielding gas to protect the
weld pool from atmospheric contamination.
For MMA welding the power source shall be supplemented with:
• welding cable with electrode holder
• return cable with clamp
5.5 Connection of welding and return cables
The power source has two outputs, a positive welding terminal (+) and a negative welding
terminal (-), for connecting welding and return cables. The output to which the welding cable
is connected depends on the welding method or type of electrode used.
Connect the return cable to the other output on the power source. Secure the return cable's
contact clamp to the work piece and ensure that there is good contact between the work
piece and the output for the return cable on the power source.
• For TIG welding, the negative welding terminal (-) is used for the welding torch and the
positive welding terminal (+) is used for the return cable.
• For MMA welding, the welding cable can be connected to the positive welding terminal
(+) or negative welding terminal (-) depending on the type of electrode used. The
connecting polarity is stated on the electrode packaging.
5.6 Turning the mains power on/off
Turn on the mains power by turning switch to the ”I” position.
Turn the unit off by turning the switch to the ”O” position.