How to weld > Shielding gas
Spray arc MAG welding
Spray arc welding normally has a rather high heat input which leads to higher productivity compared to short arc welding.
This arc has a degree of stability that contributes to a very low level of spatter. Spray arc can be performed in the flat position.
Using rutile flux-cored wires gives the advantage of welding in positions other than the flat position.
The main welding positions, related to the position of the welding torch, according to the norm EN ISO 6947.
The high heat input means that the range of suitable single plate thicknesses for this technique is limited to approximately 5 mm and above. The exception is pulsed arc welding, which can weld joints of thinner single plate thicknesses. The sound from spray arc welding can be distinguished from short arc welding by its uniform character.
Droplet transfer at spray arc welding
The metal droplet transfer has a higher frequency compared to short arc welding and the size of each metal droplet is small. In spray arc welding there are no short circuits and the droplet leaves the wire as a small droplet or a spray through the arc, according to the illustration below.
MAG welding with a spray arc: a) Welding gun. b) Droplet. c) Base metal. d) Consumable electrode. e) Shielding gas. f) Weld pool.
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