WeldCorp MIG 125, Руководство по эксплуатации для владельца

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Page 10
WELDING GUIDE
GENERAL RULE
When welding on the lowest output settings, it is necessary to keep the arc as short as
possible. This should be achieved by holding the welding torch as close as possible and at an
angle of approximately 60 degrees to the work piece. The arc length can be increased when
welding on the highest settings, an arc length up to 20mm (0,8in). can be enough when
welding on maximum settings.
GENERAL WELDING TIPS
From time to time, some faults may be observed in the weld owing to external influences
rather than due to welding machine faults. Hara are some that you may come across:
Porosity: small holes in the weld, caused by break-down in gas coverage of the weld or
sometimes by foreign bodies inclusion. Remedy is, usually, to grind out the weld. Remember,
check before the gas flux (about 8 litres/minutes), clean well the working place and finally
incline the torch while welding.
Spatter: small balls of molten metal which come out of the arc. A little quantity is
unavoidable, but it should be kept down to a minimum by selecting correct settings and
having a correct gas flow and by keeping the welding torch clean.
Narrow heap welding:
caused by moving the torch too fast or by an incorrect gas flow .
Very thick or wide welding:
can be caused by moving the torch too slowly.
Wire bums back:
It can be caused by wire feed slipping, loose or damaged welding tip, poor
wire, nozzle held too close to work or voltage too high.
Poor penetration:
It can be caused by moving torch too fast, too low voltage setting or
incorrect feed setting, reversed polarity, insufficient blunting and distance between strips.
Take care of operational parameters adjustment and improve the preparation of the work
pieces.
Work pieces piercing: it may be caused by moving the welding torch too slow, too high
welding power or by an invalid wire feeding.
Heavy spatter and porosity: can be caused by nozzle too far from work, dirt on work or
by low gas flow. You have the two parameters; remember that gas must not be lower than
7-8 litres/min. and that the current of welding is appropriate to the wire you are using. It is
advisable to have a pressure reducer of input and output. On the manometer you can read
the range expressed in litre.
Welding arc Instability:
it may be caused by an insufficient welding voltage, irregular wire
feed, and insufficient protective welding gas