©
COPYRIGHT 1998 THE ESAB GROUP, INC. LESSON
II 2.3.0.3
Gas tungsten arc welding lends itself
to both manual and automatic operation. In manual
operation, the welder holds the torch in one hand and directs the arc into the
weld joint. The
filler metal is fed manually into the leading edge of the puddle. In automatic
applications, the
torch may be automatically moved over a stationary work piece or the torch may
be stationary
with the work moved or rotated in relation to the torch. Filler metal, if
required, is also
fed automatically. 2.3.1
EQUIPMENT
AND OPERATION
- Gas tungsten arc welding may be accomplished
with relatively simple equipment, or
it may require some highly sophisticated components. Choice
of equipment depends upon the type of metal being joined, the position of the
weld being made,
and the quality of the weld metal necessary for the application. The basic
equip- ment consists
of the following: 1.
The power source
2. Electrode
holder (torch) 3.
Shielding gas
4. Tungsten
electrode 5.
Water supply when necessary
6. Ground
cable 7.
Protective equipment
Figure 6 shows a basic gas tungsten
arc welding schematic. FIGURE
6 REGULATOR
FLOW METER GAS
HOSE (WATER COOLED ONLY) TORCH
* COMPOSITE
CABLE WATER
COOLER GAS COOLED
ONLY WELDING CABLE
SHIELDING GAS
SUPPLY POWER
SOURCE WATER
FROM TORCH
WATER TO
TORCH GROUND
CABLE WORK
* COMPOSITE
CABLE GAS
COOLED TORCH. CURRENT
IN & GAS IN. WATER
COOLED TORCH. CURRENT
IN & WATER OUT GAS
TUNGSTEN ARC WELDING CONNECTION SCHEMATIC
