OM-244 324 Page 23
SECTION 8
−
GUIDELINES FOR TIG WELDING (GTAW)
8-1. Positioning The Torch
Ref. ST-161 892
1
10
−
25
10
−
15
6
2
3
4
90
4
5
3/16 in.
1/16 in.
6
5
Bottom View Of Gas Cup
!
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. Read
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.
1
Workpiece
Make sure workpiece is clean before
welding.
2
Work Clamp
Place as close to the weld as possible.
3
Torch
4
Filler Rod (If Applicable)
5
Gas Cup
6
Tungsten Electrode
Select and prepare tungsten according
to Section 7.
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.
