Kemppi Minarc 220 - Manual (Page 6)

EN
MMA Welding
The MMA is a simple welding process. A coated MMA electrode is short
circuited to the work piece and the resulting electric arc creates a molten
pool into which the electrode wire melts. The coating around the electrode
burns to create a protective gaseous atmosphere and slag, which directly
protects the molten weld pool from atmospheric contamination. The slag
floats on the molten weld pool and solidifies on the surface of the resulting
weld bead, protecting the cooling weld.
The electrode is moved slowly along the weld seam. The travel speed
is directly proportional to the size of the electrode and welding current
selected. The slag is finally removed with a chipping hammer to reveal the
weld (always use eye protection).
TIG Welding
In TIG welding, the welding arc is formed between a non-consumable
tungsten electrode and the work piece. The resulting high temperature arc
melts the work piece to form a molten pool, into which filler wire of a similar
alloy composition is slowly melted. The molten weld pool and filler wire are
protected from the harmful effects of atmospheric contamination by an inert
shielding gas that flows out from the TIG welding torch’s ceramic nozzle at a
rate of approximately 8–15 litres per minute. (Gas regulator, flow meter and
pure argon shielding gas are not provided in this package.)
2. MACHINE USE
2.1 BEFORE COMMISSIONING THE MACHINE
Minarc 220 is packed in sturdy, custom-made packaging. However, always
ensure that the equipment has not been damaged in transportation. Even so,
make sure that all in-transport damage is reported to the machine supplier.
Do not unpack the machine under these circumstances. In addition, before
commissioning, check that you have received all of the items you ordered
along with their operating instructions.
Transportation
The machine should be transported in an upright position.
Environment
The machine is suitable for both indoor and outdoor use. In outdoor use,
protect it from heavy rain and sunshine. Store the machine in a dry and clean
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c 220 / © Kemppi O
y / 1117