Hobart OM-303 Welding Processes Requiring High Frequency, Incorrect Installation, Weld Zone

SECTION 8 – HIGH FREQUENCY

8-1. Welding Processes Requiring High Frequency

Work

TIG

1 High-Frequency Voltage

Helps arc jump air gap between torch and workpiece and/or

1stabilize the arc.

high_freq1 11/96 – S-0693

8-2. Incorrect Installation

	Weld Zone
	11, 12
50 ft
(15 m)
	10
9	14
8

7

3

13 2

1

4 5 6

S-0694

Sources of Direct High-Frequency Radiation

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

2Weld Cables

3Torch

4Work Clamp

5Workpiece

6Work Table

Sources of Conduction of High		Sources of Reradiation of High
Frequency		Frequency
7	Input Power Cable	10	Ungrounded Metal Objects
8	Line Disconnect Device	11	Lighting
9	Input Supply Wiring	12	Wiring
		13	Water Pipes and Fixtures
		14	External Phone and Power Lines

OM-303 Page 20