8 | P a g e
PATON
®
VDI SERIES MINI DC MMA
ATTENTION!!!
In the manual arc welding process, after switching on the
welding unit by switch 3, the welding electrode is under voltage. Do not allow
the electrode to contact current-conducting or grounded parts, such as the
casing of the welding unit etc.
3.2 INCREASED-CURRENT ARC STARTING HOT-START
The advantages ensured by the increased-current arc starting function are the following:
1.
Improved arc starting even when low-quality electrodes are used;
2.
Better base metal penetration during the arc starting period and, as a result, the lesser number
of defects associated with incomplete penetration;
3.
Prevention of slag inclusions.
What is achieved by:
During the short time interval of arc starting, the welding current increases by 33 percent of the
welding current set by default (
see Figure 1
).
Example:
The electrode diameter is 3 mm.
The set welding current is 90 A.
The current at the increased-current arc starting stage is 90A + 33% = 120 A.
Figure 1. Increased-current arc starting HOT-START
ELECTRODE HOLDER
GROUNDING CLAMP
t (s)
WORKPIECE
