Daihen Welbee WB-A350P, Owner'S Manual

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6-15
Chapter 6 W
elding Condition
S
ETTING
W
ELDING
C
ONDITIONS
W
ELDING
C
ONDITION
C
HAPTER
6
1.
Press the torch switch while the electrode is apart from the base metal.
2.
High frequency sparks fly to generate arc between the base metal and the electrode.
NOTE
• If arc does not start within five seconds after high frequency sparks begin to fly,
generation of high frequency sparks and output voltage will stop automatically. If high
frequency sparks stop, turn off the torch switch once and then turn it on again.
When such a condition continues, check the following points.
– Confirm that the cable is firmly connected with the torch.
– Confirm that the electrode tip is not rough.
• Lift Start
Lift start is a starting method to make current flow with the electrode in touch with the base metal and
generate arc by separating the electrode from the base metal.
At the startup, no electromagnetic disturbance occurs since high frequency voltage is not generated.
1.
Press the torch switch while the electrode is off the base metal.
2.
Contact the electrode with the base metal.
●
Press the torch switch while the electrode is off the base metal.
3.
Pull the electrode off the base metal.
⇒
Arc is generated.
• No-load voltage will not be impressed even when the torch switch is pressed while the electrode
is off the base metal. However, only gas flows.
• It becomes harder to start arc as the number of times of arc start increases due to the dirt (getting
white) adhered on the surface of the electrode. Grind the electrode in such a case.
• You can start arc immediately after separating the electrode from the base metal since there is
no pre-flow period. However, if a defect is formed at the welding start portion, adjust the time to
pull the electrode from the base metal after contacting them to establish the pre-flow time as
necessary in order to completely shut off the electrode and the base metal from air with argon
gas.
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