WELD THE WORLD
Cod. 006.0001.2000
19/07/2018 V.2.0
Discovery 221AC/DC Evo
Discovery 300AC/DC Evo
37
ENGLISH
- DYNAMIC ARC
○ This function allows, on the reduction of the arc voltage, an increase of the welding current and
vice versa. The size of the DynamicArc variation may be individually adjusted to a value between
1A to 50A. For example, an increase of 50A for 1 volt variation.
○ This value must be set depending on the material thickness, and the type of processing to be
carried out (values between 1A and 20A for thin layers while a value between 20A and 50A for
medium-thick layers).
○ Welding power remains constant even when the distance between electrode and workpiece
changes.
-
Consequences of a higher value:
•
The welding arc concentration remains unchanged.
•
Prevents electrode sticking.
•
Increased welding speed.
•
Minor plastic deformity in the welded workpiece.
• Greater penetration at the apex.
•
Concentrated heat contribution only to the welding and not to the surrounding area.
•
Minor oxidation of the piece and therefore lower post-weld re-work costs.
•
Better control of first application in gaps (useful for pipe fitters and installers).
•
Ease of welding even for pieces which are not properly prepared.
•
Minimization of errors and greater arc stability with motion variations.
STANDARD TIG DC WELDING
TIG DC WELDING WITH DYNAMIC ARC
D
D
2mm
10mm
D
D
2mm
10mm
In varying the length of the arc, the weld pool (D) widens
with a consequent increase in the heat contribution of
the workpiece, causing it to overheat.
By varying the arc length the weld pool is exactly the
same size (D) while avoiding the overheating of the
piece, plastic deformations and loss of mechanical char-
acteristics.
Volts
Ampere
Tab. 14 - Recommended DYNAMIC ARC parameters
ANY TYPE OF JOINT
Sheet thickness (mm)
Current (A)
DnyArc Value (Amperes)
1.0 mm
35A - 50A
5 - 10
2.0 mm
50A - 80A
10 - 15
3.0 mm
80A - 140A
15 - 25
4.0 mm
140A - 170A
25 - 50
In order to have optimum control of the arc, it is advisable to ignite it at a distance of between 4-5mm from the
initial point of the joint (point zero) .
Antwerpsesteenweg 949 9041 Gent - Oostakker
[email protected]
www.welda.be
T
+32 (0)9 355 74 26
F
+32 (0)9 355 92 01
