Miller Bobcat 250 Diesel Owner's Manual page 64

12-7. Conditions That Affect Weld Bead Shape
Angle Too Small
Electrode Angle
Arc Length
Too Short
Travel Speed
12-8. Electrode Movement During Welding
1
12-9. Welding Lap Joints
2
OM-258413 Page 60
Correct Angle
° -
10 30
Drag
Normal
Normal
Slow
3
°
30
Or Less
1
3
°
Angle Too Large
Too Long
Fast
2
°
30
Or Less
1
.
Weld bead shape is affected
by electrode angle, arc length,
travel speed, and thickness of
base metal.
Spatter
.
Normally, a single stringer
bead is satisfactory for most
narrow groove weld joints;
however, for wide groove weld
joints or bridging across gaps,
a weave bead or multiple
stringer beads work better.
1 Stringer Bead − Steady
Movement Along Seam
2 Weave Bead − Side to Side
Movement Along Seam
3 Weave Patterns
Use weave patterns to cover a
wide area in one pass of the elec-
trode. Do not let weave width ex-
ceed 2-1/2 times diameter of
electrode.
1 Electrode
2 Single-Layer Fillet Weld
Move electrode in circular motion.
3 Multi-Layer Fillet Weld
Weld a second layer when a heavi-
er fillet is needed. Remove slag be-
fore making another weld pass.
Weld both sides of joint for maxi-
mum strength.
S-0061
S-0054-A
S-0063 / S-0064