Section 15 - Tig Procedures; Lift-Arc And Hf Tig Start Procedures - Miller Dynasty 280 Series Owner's Manual

SECTION 5
SECTION 5
SECTION 5

15-1. Lift-Arc And HF TIG Start Procedures

Lift-Arc Start Method
"Touch" 1–2 Seconds
Do NOT Strike Like A Match!
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TIG PROCEDURES
SECTION 15 – TIG PROCEDURES
TIG PROCEDURES
TIG PROCEDURES
1 2
1 2
1 2
Lift-Arc Start
When Lift-Arc button light is On, start arc as
™
follows:
1 TIG Electrode
2 Workpiece
Touch tungsten electrode to workpiece at
weld start point, enable output and shielding
gas with torch trigger, foot control, or hand
control. Hold electrode to workpiece for 1-
2 seconds, and slowly lift electrode. Arc is
formed when electrode is lifted.
Normal open-circuit voltage is not present
before tungsten electrode touches work-
piece; only a low sensing voltage is present
between electrode and workpiece. The solid-
state output contactor does not energize until
after electrode is touching workpiece. This
allows a properly prepared electrode (see
Section 16) to touch workpiece without over-
heating, sticking, or getting contaminated.
Application:
Lift-Arc is used for the DCEN or AC GTAW
process when HF Start method is not permit-
ted, or to replace the scratch method.
HF Start
When HF Start button light is On, start arc as
follows:
High frequency turns on to start arc when
output is enabled. High frequency turns off
when arc is started, and turns on whenever
arc is broken to help restart arc.
Application:
HF start is used for the DCEN GTAW, or the
AC GTAW process when a non-contact arc
starting method is required.
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OM-275857 Page 17