28 A
satisfactory method of getting the required penetration of the finishing weld
without excessive reinforcement
is to back gouge a groove 1/8 to 5/16-in. deep in the top of the joint after the
backing weld has
been made. When gouging is used, no additional preparation or cleaning is needed
except to remove any
adhering slag. The
advantage of the square groove butt joint is that it requires a minimum of edge
preparation yet produces
good quality welds with adequate penetration. Single-Vee
Groove Butt Joint a)Single-Vee
Groove with Root Face (Fig. 12b.) This
joint type is used with non-fusible backing for single-pass butt welds of 5/16-in.
or greater thickness. For
most industrial applications, the maximum thickness is in the neighborhood of
1-1/4 to 1-1/2-in. The root b.
Single-Vee Groove Butt Joint with Root Face c.
Single- Vee Groove Butt Joint without Root Face d.
Double- Vee Groove Butt Joint e.
Single-Vee Groove and U Groove Butt Joint FIG.
12 - Types of Butt Joint Welds f.
Single-U Groove Butt Joint a.
Square Groove ButtJoint
