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Waveform of speed short arc welding process
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
Reduce the amount of spatter compared to the globular mode
Achieve good weld appearance
Reduce smoke emissions compared with the usual modes (up to 25% less)
Achieve good rounded penetration
Enable welding in all positions
Note
: The CO
2
programmes automatically and exclusively use the “soft” short arc and do not enable access to the speed
short arc. The “dynamic” short arc is not suitable for CO
2
, welding due to arc instability.
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
SPEEDTEC 320CP
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 M12 or M11 shield (average 30A is acceptable).
The appearance of joints processed using,
SPEEDTEC 320CP
is of a quality comparable with that achieved by TIG
welding.
