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6
1.3 About welding
MinarcTig is a precise welding tool and will provide high quality results
time after time provided the correct operational procedures are followed.
Welding quality is not only inuenced by the machine itself. Personal
expertise, ancillary equipment and consumables also play an essential role,
as does the correct, fused supply power.
Welding is carried out when an electric arc is established between the
welding electrode and work piece. Welding is not possible unless the
equipment is correctly set-up, including the earthing cable attached to the
work piece. This cable creates the welding circuit that allows the welding
current to ow. Please check the earthing clamp is on the work piece to be
welded, and that the area of the clamps contact is clean and free from paint.
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 solidies 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 eects 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.)
6 MinarcTig 180, 180MLP, 250, 250 MLP
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