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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

oats on the molten weld pool and solidies 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 nally 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 ller wire of a similar

alloy composition is slowly melted. The molten weld pool and ller wire are

protected from the harmful eects of atmospheric contamination by an inert

shielding gas that ows out from the TIG welding torch’s ceramic nozzle at a

rate of approximately 8–15 litres per minute. (Gas regulator, ow 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

Kemppi Minarc 220 User Manual

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