Characteristics of MAG Stainless Steel Welding
Let's discuss about MAG stainless steel welding!
MAG stainless steel welding generally uses DC power and reverse polarity connections. Do not use pure argon for the shielding gas, as this will cause arc instability and poor welding formation. Usually use weak oxidizing gas protection, such as Ar (1% ~ 5%) O2 or Ar (5% ~ 10%) CO2. An inert gas mixture of Ar (30% to 50%) He can also be used when welding thick plates.
The use of oxidizing mixed gas as a protective gas during MAG stainless steel welding has the following characteristics:
1) During MAG stainless steel welding, adding a small amount of oxidizing gas can reduce the surface tension of liquid metal, thereby reducing the critical current of jet transition and improving the stability of droplet transition.
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2) Stabilize the cathode spot. Since new cathode spots are continuously generated on the molten pool, the arc does not flutter and mainly falls on the molten pool, which improves the stability of the arc.
3) As the arc is stable and the fluidity of the metal material in the molten pool is improved, the welding shape is improved and the surface is beautiful.
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