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TM-353 Page 39Syncrowave 250
SECTION 8 – HIGH FREQUENCY (HF)
8-1. Welding Processes Using HF
high_freq1 7/95 – S-0693
1 HF Voltage
GTAW – helps arc jump air gap
between torch and workpiece and/
or stabilize the arc.
SAW – helps arc reach workpiece
through flux granules.
2 Flux
1
2
1
Gas Tungsten Arc
Welding (GTAW)
Submerged Arc
Welding (SAW)
Work Work
50 ft
(15 m)
S-0694
Sources Of Direct HF Radiation
1 HF source (welding power source with
built-in HF or separate HF unit)
2 Weld Cables
3 Torch
4 Work Clamp
5 Workpiece
6 Work Table
Sources Of Conduction Of HF
7 Input Power Cable
8 Line Disconnect Device
9 Input Supply Wiring
Sources Of Reradiation Of HF
10 Ungrounded Metal Objects
11 Lighting
12 Wiring
13 Water Pipes And Fixtures
14 External Phone And Power Lines
8-2. Sources Of HF Radiation From Incorrect Installation
Weld Zone
13
9
8
7
1
2
4 5 6
3
10
11, 12
14