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PATON VDI SERIES ECO DC MMA
3.1 INCREASED-CURRENT ARC STARTING HOT-START
The advantages ensured by the increased-current arc starting function are the following:
The improved arc starting even when low-quality electrodes are used
The more complete fusion penetration during arc starting period and, as a result, the lower
number of defects associated with incomplete fusion.
Prevention of slag inclusions
What is achieved by:
During a short time, interval of arc starting, the welding current increases
by 33 % of the set welding current
(see pic 3).
Example:
Electrode diameter is 3 mm.
Set welding current is 90 A.
The current at the increased-current arc starting stage is 90 + 0.33
90 = 120 A.
3.2. REDUCED-VOLTAGE WELDING FUNCTION (ARC-FORCE)
The advantages ensured by the reduced-voltage welding function are the following:
The enhanced arc stability in short arc welding mode
The improved transfer of metal drops into the molten pool
Improved arc starting
The reduced probability of electrode sticking
What is achieved by:
When the arc voltage drop is lower then the minimum voltage required for stable arcing, the welding
current increases by 50% relative to the set current
(see pic. 4).
This function may be disabled, for example, when welding sheet materials and when the welding unit
is connected to a low-powered voltage source (the welding unit with this function enabled consumes
additional power).
Pic.3. Increased-current arc starting HOT-START
t (s)
