Farmweld

SUITABLE MATERIALS

Suitable Materials welded by M.I.G./M.A.G.

Mild, carbon steels
Carbon steels are welded with direct current and electrode positive polarity (the wire electrode is connected to the positive pole) using exclusively the M.A.G. welding procedure. Applications may range from the use of CO2 only, to argon - CO2 mixtures in differing proportions (the most common is 80% argon, 20% CO2 ).
The greater the percentage of argon in the mixture the better the properties and arc stability.
The weld has very good properties, especially with short arc where dense/thick weld pools are obtained, allowing welding in all positions.
The use of wires with silicon and manganese content will lead to the elimination of impurities present in the base material and obtain good quality welds.
Bevelled seams should be prepared with thicknesses greater than 3 mm.

Stainless steels
Stainless steels are welded with direct current and electrode positive polarity (the wire electrode is connected to the positive pole) using exclusively the M.A.G. welding procedure.
The gas shield used should consist of Ar + CO2 or Ar + Oxygen mixtures. The proportion of argon in the mixture should never fall below 98% so as to avoid strong oxidation of the chrome present in the base material. Seams thicker than 2.5 mm should be bevelled. Care should be taken to choose the most suitable welding material for the quality of the stainless steel being welded. To achieve a good weld, we advise grinding the spots.

Aluminium and its alloys
Aluminium and its alloys are welded in direct current or pulsed current with electrode positive polarity (the wire electrode is connected to the positive pole) using the M.A.G. welding procedure. The gas shield used is usually pure argon. Pure helium or an argon + helium mixture can also be used. For horizontal welding, irrespective of the thickness, the spray-arc and/or pulsed-arc technique is used; the short-arc technique is used, instead, on thin vertical or corner welds. Given the properties of aluminium, milling the spots instead of grinding is advisable.

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