Weco Discovery 300 AC/DC, Instruction Manual

Page: 26 / 34

Cod.006.0001.1840
13/07/2016 v2.2
ENGLISH
Discovery 300 AC/DC
26/34
13.8 2T SPOT HF WELDING
1. Bring the torch up to the work until the electrode tip is approximately 2 or 3 mm away.
2. Press (1T) the torch trigger.
The arc strikes without contact with the workpiece and the voltage discharges (HF) cease automatically.
3. Release (2T) the torch trigger.
The welding current reaches the preset value, by way of a up slope time, if programmed.
The welding procedure continues, at the preset current, for the time set with the spot time parameter.
The current reaches the end current value in the time set in the down slope time parameter.
The arc is extinguished.
Gas delivery continues for the time set in the post gas parameter.
Keep pressed torch trigger procedure
Bring the torch up to the work until the electrode tip is approximately 2 or 3 mm away.
Press (1T) the torch trigger.
The arc strikes without contact with the workpiece and the voltage discharges (HF) cease automatically.
The welding current reaches the preset value, by way of a up slope time, if programmed.
The welding procedure continues, at the preset current, for the time set with the spot time parameter.
The current reaches the end current value in the time set in the down slope time parameter.
The arc is extinguished.
Gas delivery continues for the time set in the post gas parameter.
Touch the workpiece with the torch electrode.
Slowly lift the torch to strike the arc.
13.9 PILOT ARC WELDING
The pilot arc can be activated in the following torch trigger procedures:
−
4T LIFT-ARC WELDING
−
4 TIMES + HF WELDING (4T HF)
−
4 TIMES BI-LEVEL + HF WELDING (4T BI-LEVEL HF)
The welding procedure with pilot arc differs with respect to the procedure without pilot arc in the part of the torch trigger procedure described
below.
LIFT-ARC Welding
Touch the workpiece with the torch electrode.
Press (1T) and keep the torch trigger pressed.
Slowly lift the torch to strike the arc.
The arc strikes, the welding current assumes the pilot current value.
Release (2T) the torch trigger.
The welding current reaches the preset value, by way of a up slope time, if programmed.
etc.
Welding with HF
Press (1T) and keep the torch trigger pressed.
The arc strikes without contact with the part and the voltage discharges (HF) cease automatically, the welding current will assume the pilot
current value.
Release (2T) the torch trigger.
The welding current reaches the preset value, by way of a up slope time, if programmed.
etc.