Lincoln Electric 12716, Operator'S Manual, Page: 33 / 64

B-12
OPERATION FRONTIER ® 400X
WELD MODE SETTINGS CONT
• Weld Terminal - Allows the operator to select if the
welding terminals are always electrically hot or turned
on or off via a remote trigger.
• Memory Mode - Allows the operator save a memory
based off the current weld mode and welding settings
or recall a previously saved memory.
• Frequency - Adjusting the frequency from “OFF” to a
value between 0.1-20 Hz will turn on pulse TIG. The
frequency changes the number of pulses per second.
Pulse TIG can help to minimize burn through on thin
materials by reducing the heat input.
• Percent Peak Current - If pulse frequency is ON,
this se
tti
ng changes percentage of
ti
me spent at the
peak current vs the background current. The operator
can set the value from 5% up to 95%, which affects
the amount of heat input into the weld. The default
setting is 50%.
• Remote Accessory Type - Allows the operator to
change between a Foot Pedal or Hand Control.
• Start Type - Choose between Touch Start and Scratch
Start. Touch Start is a cleaner process needing only a
light, quick touch of the tungsten to the work piece.
Scratch start requires dragging the tungsten across
the work much like striking a match. Scratch start can
be easier to use but could poten
ti
ally contaminate the
weld and the tungsten.
NOTE
: Touch Start mode avoids tungsten contamina
ti
on
without the use of a high frequency unit. During the
ti
me the
tungsten is touching the work, there is very li
tt
le voltage or
current and, in general, this avoids tungsten contamina
ti
on.
Then, the tungsten is gently li
ft
ed off the work in a rocking
mo
ti
on, which establishes the arc. To stop the arc, simply
li
ft
the TIG torch away from the work piece. When the arc
voltage reaches approximately 30 volts, the arc will go out
and the machine will automa
ti
cally reset to the touch start
current level. The tungsten may then be retouched to the
work piece to restrike the arc. The arc may also be started
and stopped with an amptrol or arc start switch.
While using TOUCH START TIG mode, it is important to use
the proper welding cable size to ensure expected
performance levels.
FIGURE B.10