Figure 7-17.Butt joints in the flat position.
Earlier reexplained that welding can be done in
any position, but it is much simpler when done in the
flat position. In this position, the work is less tiring,
welding speed is faster, the molten puddle is not as likely
to run, and better penetration can be achieved. When-
ever possible, try to position the work so you can weld
in the flat position. In the flat position, the face of the
weld is approximately horizontal.
Butt joints are the primary type of joints used in the
flat position of welding; however, flat-position welding
can be made on just about any type of joint providing
you can rotate the section you are welding on to the
appropriate position. Techniques that are useful in mak-
ing butt joints in the flat position, with and without the
use of backing strips, are described below.
BUTT JOINTS WITHOUT BACKING
STRIPS. A butt joint is used to join two plates having
surfaces in about the same plane. Several forms of butt
joints are shown in figure 7-17.
Plates up to 1/8 inch thick can be welded in one pass
with no special edge preparation. Plates from 1/8 to 3/16
inch in thickness also can be welded with no special
edge preparation by welding on both sides of the joint.