Miller Weldcraft WP-125M Panduan Pemilik - Halaman 16

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SECTION 7 − GUIDELINES FOR TIG WELDING (GTAW)

7-1. Positioning The Torch

10−25

Bottom View Of Gas Cup

10−15

1/16 in.

3/16 in.

Grinding the tungsten electrode

produces dust and flying sparks

which can cause injury and start

fires. Use local exhaust (forced

ventilation) at the grinder or wear

an approved respirator.

MSDS for safety information.

Consider using cerium or lantha-

num based tungsten instead of

thoriated. Thorium dust contains

low-level radioactive material.

Properly dispose of grinder dust

in an environmentally safe way.

Wear proper face, hand, and

body protection. Keep flam-

mables away.

Workpiece

Make sure workpiece is clean before

welding.

Work Clamp

Place as close to the weld as possible.

Torch

Filler Rod (If Applicable)

Gas Cup

Tungsten Electrode

Select and prepare tungsten according

to Section 6.

Guidelines:

The inside diameter of the gas cup

should be at least three times the

tungsten diameter to provide adequate

shielding gas coverage. (For example,

if tungsten is 1/16 in. diameter, gas cup

should be a minimum of 3/16 in.

diameter.

Tungsten extension is the distance the

tungsten extends out gas cup of torch.

The tungsten extension should be no

greater than the inside diameter of the

gas cup.

Arc length is the distance from the

tungsten to the workpiece.

Read

Ref. ST-161 892

OM-226 276 Page 13