Figure 8-19.GTA welding in the horizontal position.
Figure 8-20.GTA welding vertical downward.
and out of the puddle about every 1/4 of an inch of travel.
If you add the filler rod to the molten puddle at just the
right time uniform welds result every time.
Rules for quality welding in the flat position also
must be followed for out-of-position GTA welding.
Cleanliness, good joint fit-up, preheat, sufficient shield-
ing gas, and correct welding current are important. In
addition, you should not use high welding current or
deposit large weld beads. Direct the arc so there is no
overheating at anyone area that could cause sagging or
undercutting. The adding of filler metal, bead size, and
sequence must be done correctly to ensure complete
fusion between passes.
HORIZONTAL WELDING. When welding in
the horizontal position, start the arc on the edge of the
Figure 8-21.GTA welding vertical upward.
Figure 8-22.GTA welding overhead.
joint. Then hold the torch at a work angle of 15 degrees
and a push angle of 15 degrees. After you establish the
puddle, dip the rod into the front edge of the puddle on
the high side as you move the torch along the joint (fig.
8-19). Maintain an arc length as close as possible to the
diameter of the electrode. Correct arc length coupled
with the correct speed of travel helps prevent undercut-
ting and permits complete penetration.
VERTICAL WELDING. When welding thin
material with the GTA welding process, you should weld
from the top, moving downward (fig. 8-20). This helps
you produce an adequate weld without burning through
the metal. Filler material is not normally needed for
On heavier materials, you should weld from the
bottom, upwards (fig. 8-21). This enables you to achieve
adequate penetration. When welding upward, you nor-
mally need to use a filler rod.