Lincoln Electric SAF-FRO DIGISTEEL III 320C Safety Instructions For Operation And Maintenance page 24

By eliminating the "globular" arc mode, which is characterized by heavy and sticky spatter and higher energy than the short arc, the
speed short arc enables to:
Reduce the amount of distortions at high welding currents in the typical "globular" welding range
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Reduce the amount of spatter compared to the globular mode
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Achieve good weld appearance
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reduce smoke emissions compared with the usual modes (up to 25% less)
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Achieve good rounded penetration
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Enable welding in all positions
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Note: The CO programmes automatically and exclusively use the "soft" short arc and do not enable access to the speed short arc.
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The "dynamic" short arc is not suitable for CO
NORMAL Pulsed MIG
Metal transfer in the arc takes place by detachment of droplets caused by current pulses. The microprocessor calculates all the Pulsed MIG
parameters for each wire speed, to ensure superior welding and striking results.
The advantages of pulsed Mig are :
+ Reduced distortions at high welding currents in the customary "globular" welding and spray arc ranges
+ Enables all welding positions
+ Excellent fusion of stainless steel and aluminium wires
+ Almost complete elimination of spatter and hence of finishing work
+ good bead appearance
+ Reduced smoke emissions compared with customary methods and even-speed short-arc (up to 50% less);
Pulsed DIGISTEEL III 320C / DIGIPULS III 320C programs for stainless steel eliminate the small spatter that may occur on thin sheets at very
low wire feed speeds. These "balls" are caused by slight spraying of the metal at the time of droplet detachment. The extent of this
phenomenon depends on the type and origin of the wires.
These programmes for stainless steel have undergone improvements for operation at low currents and increasing the flexibility of use for thin
sheet welding using Pulsed MIG method.
Excellent results for welding thin stainless steel sheets (1 mm) are obtained using the pulsed MIG method with Ø 1 mm wire in Arcal-12 or
Noxalic-12 shield (average 30A is acceptable).
The appearance of joints processed using, DIGISTEEL III 320C / DIGIPULS III 320C is of a quality comparable with that achieved by TIG
welding.
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Waveform of speed short arc welding process
, welding due to arc instability.
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DIGISTEEL III 320C / DIGIPULS III 320C
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