Miller Dynasty 400, Owner'S Manual

Page: 89 / 94

OM-275857 Page 79
SECTION 15 – TIG PROCEDURES
15-1. Lift-Arc And HF TIG Start Procedures
Lift-Arc Start Method
OM-275857 Page 17
SECTION 5 TIG PROCEDURES
5-1. Lift-Arc And HF TIG Start Procedures
1 2
“Touch” 1–2 Seconds
OM-275857 Page 17
SECTION 5 TIG PROCEDURES
5-1. Lift-Arc And HF TIG Start Procedures
1 2
OM-275857 Page 17
SECTION 5 TIG PROCEDURES
5-1. Lift-Arc And HF TIG Start Procedures
1 2
Do NOT Strike Like A Match!
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 14) 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.