Hobart 180 SD manual High Frequency HF, Welding Processes Using HF

SECTION 6 – HIGH FREQUENCY (HF)

6-1. Welding Processes Using HF

	2
	1
	1
Work	Work
Gas Tungsten Arc	Submerged Arc
Welding (GTAW)	Welding (SAW)

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

high_freq1 7/95 – S-0693

6-2. Sources Of HF Radiation From Incorrect Installation

Weld Zone

11, 12

50 ft

(15 m)

10 9

8

7

3

13	2
	1

14

Sources Of Direct HF Radiation

1HF source (welding power source with built-in HF or separate HF unit)

2Weld Cables

3Torch

4Work Clamp

4 5 6

5Workpiece

6Work Table

Sources Of Conduction Of HF

7Input Power Cable

8Line Disconnect Device

9Input Supply Wiring

S-0694

Sources Of Reradiation Of HF

10Ungrounded Metal Objects

11Lighting

12Wiring

13Water Pipes And Fixtures

14External Phone And Power Lines

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