Miller Bobcat 225 Owner's Manual page 67

12-9. Welding Lap Joints
1-1. Welding Lap Joints
1-1. Welding Lap Joints
2
1-2. Welding Groove (Butt) Joints
12-10. Welding Groove (Butt) Joints
1
2
1-2. Welding Groove (Butt) Joints
1
1-3. Welding T-Joints
1-3. Welding T-Joints
1-4. Weld Test
2
1-4. Weld Test
2 3 in.
(51-76 mm)
1/4 in.
30
1
30
1
3
3
30
1/16 in.
(1.6 mm)
3
30
1/16 in.
(1.6 mm)
3
1
45
2
2
1
45
2
3
3
2
30
1
30
1
2
2
4
4
2 3 in.
(51-76 mm)
2
1 Electrode
2 Single-Layer Fillet Weld
Move electrode in circular motion.
3 Multi-Layer Fillet Weld
Weld a second layer when a heavier fillet is
needed. Remove slag before making anoth-
er weld pass. Weld both sides of joint for
maximum strength.
1 Tack Welds
Prevent butt joint distortion by tack welding
the materials in position before final weld.
Workpiece distortion occurs when heat is ap-
plied locally to a joint. One side of a metal
plate will curl up toward the weld. Distortion
will also cause the edges of a butt joint to pull
together ahead of the electrode as the weld
cools.
2 Square Groove Weld
3 Single V-Groove Weld
4 Double V-Groove Weld
Materials up to 3/16 in. (5 mm) thick can
often be welded without special preparation
using the square groove weld. However,
when welding thicker materials it may be
necessary to prepare the edges (V-groove)
of butt joints to ensure good welds.
The single or double V-groove weld is good
for materials 3/16 - 3/4 in. (5-19 mm) thick.
Generally, the single V-groove is used on
materials up to 3/4 in. (19 mm) thick and
when, regardless of thickness, you can weld
from one side only. Create a 30 degree bevel
with oxyacetylene or plasma cutting equip-
ment. Remove scale from material after cut-
1
ting. A grinder can also be used to prepare
bevels.
3
1
3
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OM-286503 Page 63
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