Craftsman 113.201892 Owner's Manual page 18

Figure 1 !
Figure 8
Figure 9
Figure TO
Figure 13
LAP WEL|)S
Figure 14
Figure: 16
LAP: WELDS
Figure 15
i ii iiiiiiii
iNTERMITTENT
WELDS
Figure I7
WELD ON BOTH SIDES
ATEND OFJOINT
i i
STAGGERED
INTER-
MffTENT
WELDS
should be nearly flat with a slight radius at the sides or
toes. Avoid excessive concave or convex surfaces of the
fillet (fig. 7). Undercuts and cold-taps are caused by not
holding the rod in the center of the seam (fig. 8): ;If the
desired fillet weld cannot be made with a Single pass,
severat passes ore usedto build it up to required size (fig, 9);
Stag must be cleaned from each pass before depositing
the next. Fillet welds over 1/2÷inch in size are rarely used
because joints requiring more strength can be made more
economically by beveling and groove-welding, followed
by a small concave fitlet weld to provide a radius in the
corner.
.HoriZontal fillet welding is used when the side or edge of
one member of the joint is in the vertical position particularly
fay small single-pass welds where the work cannot be tilted.
For practice, tack-weld two pieces of scrap together to
form a tee-joint (fig. 10). Use a 5/32-inch rod held at
angles indicated, and direct the arc into the corner of the
joint. The arc tength should be somewhat shorter than for
flat fillet welding. To assure penetration at the root, Use: t he
highest welding current that can be handled (fig. 11).
Good penetration is of prime importance an_dappearance
Wi|l _:coi_ewith experience. If the arc is advanced too fast,
o_:_eld:too close to:the Vertical plate, undercutting may
tbsu]f (fig_ 12). Too Slow travel will cause overlapping and
_iti:extre_nely close arc or low current will produce a bead
witha Convex surface (fig. 13). To check the penetration and
S0undnessof the bead, break some of the welds for inspec-
tion, as shown in figure 4.
Whe_ making a lap weld, care should be taken not to melt
too much of the upper corner on the top plate (fig. 14).
Some melting will take place, but proper advance of the
rod will cause the weld metal to build up and blend into the
top surface. On sheet metal hold the 3/32-inch rod almost
perpendicular and move the arc rapidly. Welds of this
type should be wider than they are high, somewhat like a
f|at bead (fig. 15). A slight discoloration on the underside
of the lower sheet indicates good penetration. On heavy
metal, a :3/8-inch fillet weld can be laid in one passwith a
1/4-inch rod using a 295-ampere machine. However, with
Smaller machines, the same weld or larger can be made by
building up with e number of passes (fig. 16). When
welding 10rig narrow pieces, stagger the welds in short
intermittent beads, first on one side then on the other side,
to minimize distortion (fig. 17).
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