gala gar GALA MIG 3000 Manual Técnico De Instrucciones página 22

4.1 RECOMMENDATIONS FOR THE USE OF THE EQUIPMENT AND WELDING OPERATION.
MATERIALS AND GASES.
The adjustment of the welding parameters in the MIG-MAG equipment is a much more sensitive job than in
traditional welding equipment. The adjustment depends mainly on:
- Welding tension.
- Wire speed.
- Type of gas used.
- Thickness and material of the part to be welded.
- Arc length, torch position and type of seam.
The welding intensity depends on the wire speed. If the wire speed increases, the welding current value will
increase resulting in a shorter arc.
If maximum penetration is desired, the minimum tension possible must be used. Although it must be taken
into account that as the tension drops the seam aspect worsens. The correct adjustment of the welding
parameters results in a smooth and quiet operation, with a typical sound during operation. If the wire speed is
high, the wire tends to trip up and the arc becomes unstable. If the speed is low there may be many
projections or the wire can get burnt.
SOFT AND WEAKLY ALLOYED STEELS WELDING.
We recommend using a gas mixture of Argon plus CO2. Remember there are special mixtures, which will
optimise the welding process. The best gas flows are between 8 and 12 litres/minute, depending on the wire
diameter and the part thickness.
Pure CO2 can be used, although we do not recommend this as, since it provides greater welding
penetration, the aspect of the welded seam is worse, and also the number of projections is higher.
STAINLESS STEELS WELDING.
In this case the most suitable gas is pure Argon. If this gas does not offer suitable results in the job to be
done, we advise using a mixture of Argon and 2% oxygen.
The best gas flows are between 8 and 12 l/min. The wire coil will be of stainless steel with suitable
composition depending on the material to be welded.
ALUMINIUM WELDING.
The gas to be used in this case is pure Argon (MIG welding system). The flows will be between 8 and 18
l/min. The minimum aluminium filler wire diameter will be 1 mm. Aluminium is a soft material, which can
cause problems in driving. Insert a drive roller with "U" type groove. Do not press the motor handle too
much. The torch cable must be of Teflon. Torch neck: Strap cable. If you wish to weld with aluminium and
have doubts, contact us.
FINE PLATE WELDING.
If you wish to weld plates that are less than 1 mm thick, we advise taking the following
measures:
1. If the result obtained with the 0.8 mm diameter filler wire is not good, the plate is
perforated or the arc stability is not correct, use a 0.6 mm diameter steeled wire. Welding
voltage in points 1 or 2.
2. If there is no arc stability and even when 0.6 mm diameter filler wire is used, verify that
the length of the free wire does not exceed 5 mm.
GALA MIG 3000/3800. 22