Tig Gtaw; Special Welding Processes Available; Power Mode - Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual

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TIG GTAW

The TIG mode features continuous control from 5 to
425 amps. The TIG mode can be run in either the
Touch Start TIG or Scratch start mode.
The Arc Control level selects the starting mode.
Between –10 and 0, the Touch Start TIG mode is
selected. The OCV is controlled below 10V and the
short circuit "TIG touch" current is maintained at
approximately 25 amps, independent of the preset cur-
rent. When the tungsten is lifted, an arc is initiated and
the output is regulated at the preset value. A setting of
0, results in the most positive arc initiation. A setting of
-10 reduces hot start.
Between 0 and 10, the Scratch starting TIG mode is
selected. In this range, the OCV of the machine is con-
trolled between 50 and 70 volts.
SPECIAL WELDING
AVAILABLE ON THIS MACHINE

POWER MODE™

The Power Mode™ process was developed by Lincoln
to maintain a stable and smooth arc at low procedure
settings which are needed to weld thin metal without
pop-outs or burning-through. For Aluminum welding, it
provides excellent control and the ability to maintain
constant arc length. This results in improved welding
performance in two primary types of applications.
• Short Arc MIG at low procedure settings.
• Aluminum MIG welding.
Recommended Welding Procedures for Power Mode
MATERIAL Aluminum 4043 Aluminum 5356
WIRE E4043 E5356
WIRE SIZE 0.035 0.035
GAS 100% Ar. 100% Ar.
125 / 2.25 125 / 1.75
22 ga.
20 ga. 150 / 2.5 150 / 2.3
18 ga. 200 / 3.75 200 / 3.0
16 ga.
300 / 7.75 300 / 6.85
14 ga. 400 / 9.0 400 / 7.5
12 ga.
450 / 9.5 450 / 8.0
10 ga. 500 / 10.0 500 / 8.5
3/16 600 / 11.25 600 / 9.5
1/4 700 / 11
OPERATION
PROCESSES
Mild Steel Mild Steel Mild Steel
L56 L56 L56
0.025 0.025 0.030
100% CO 75/25% Ar/CO 100% CO
2 2
Not Recommended 100 / 0.8 Not Recommended
120 / 1.0 120 / 1.0 100 / 0.7
110 / 1.5
140 / 1.7 140 / 1.5
190 / 2.0 190 / 2.0 125 / 2.0
160 / 2.3
260 / 3.0 260 / 3.0
330 / 5.0 330 / 4.5 230 / 3.5
300 / 6.0
400 / 7.5
POWER WAVE 355/405
Power Mode™ is a method of high speed regulation of
the output power whenever an arc is established. It
provides a fast response to changes in the arc. The
higher the Power Mode Setting, the longer the arc. If a
welding procedure is not established, the best way to
determine the Power Mode Setting is by experimenta-
tion until the desired output result is established.
In the Power Mode variables need to be set:
• Wire Feed Speed
• Output
• Arc Control
Setting up a Power Mode procedure is similar to set-
ting a CV MIG procedure. Select a shielding gas
appropriate for a short arc process.
• For steel, use 75/25 Ar/CO2 shield gas.
• For Stainless, select a Helium blend Tri-Mix.
• For Aluminum, use 100% Ar.
Start by setting the wire feed speed based upon mate-
rial thickness and appropriate travel speed. Then
adjust the Output knob as follows:
• For steel, listen for the traditional "frying egg"
sound of a good short-arc MIG procedure to know
you have the process set correctly.
• For aluminum, simply adjust the Output knob until
the desired arc length is obtained.
Note the Volts display is simply a relative number and
DOES NOT correspond to voltage.
Some procedure recommendations appear in the table
below.
Mild Steel Mild Steel
L56 L56
0.030 0.035
75/25% Ar/CO 100% CO 75/25% Ar/CO
2 2 2
90 / 1.0
100 / 1.0
110 / 1.5 100 / 2.5
125 / 2.0 125 / 3.0
160 / 2.3
160 / 3.8
230 / 3.5 200 / 5.0
300 / 6.0 240 / 6.5
400 / 7.0
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Mild Steel Stainless Steel Stainless Steel
L56 E308L E308L
0.035 0.030 0.035
Tri-mix Tri-mix
2
80 / 1.5 50 / 0.5
100 / 2.5 110 / 2.0 110 / 2.0
125 / 3.0 140 / 2.5 130 / 2.7
160 / 3.5 210 / 3.0 190 / 3.5
200 / 4.5 270 / 5.0 230 / 6.0
240 / 7.0 325 / 6.5 300 / 7.0