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13
2. Carefully clean ends of blade which will
contact welder jaws. Remove any dirt, oil,
scale and oxide.
Any rust (oxide) on blade in
vicinity of weld must be ground off before
blade can be welded.
3. Turn pressure knob (Figure 15) to “0” position
(pointed downward). NOTE: There will be
some resistance when turning knob.
4. Insert one end of blade into left clamp. Position
back edge of blade against back edge of left
clamp. Then position the end of the blade
midway between left and right clamps. Tighten
left clamp.
5. Insert opposite end of blade into right clamp.
Position back edge of blade against back edge
of right clamp. Then butt the end of blade
against the other end of blade (the blade ends
need to be in contact with each other). Tighten
right clamp.
6. Set pressure selector switch (counterclockwise
rotation) to the approximate setting required
for the width of the blade being welded.
Keep hands clear of weld area
and clamp jaws during welding.
7. Press and hold weld button (Figure 15). When
weld button is pushed, the left clamp moves to
the right to apply pressure to the blade ends.
Simultaneously, sparks will be emitted from the
blade ends as they are being welded. Do not
release weld button until blade joint is “red
hot.”
Figure 15
8. Release weld button, and wait 3 or 4 seconds
until blade returns to original color. Unclamp
blade.
9. Rotate pressure selector switch back to “0”.
10. Remove blade from clamps, and carefully
inspect it. The spacing of the teeth should be
uniform and the weld should be located in
center of gullet. Misalignment is easily noted at
this time from the weld appearance. See
Figure 16 for examples of incorrect welds.
11. If the weld is imperfect, refer to section 15.3 for
possible remedies to any problems. Make
corrections before annealing.
Figure 16
12.4 Annealing
The blade must now be annealed, or cooled at a
controlled rate to prevent it becoming too brittle.
The general procedure follows. Specific procedure
will depend upon blade type, as described in
sections 12.4.1 through 12.4.3.
1. Turn pressure selector knob all the way to left
so clamp jaws are closest to each other.
2. Insert blade into clamps so that weld area is
centered between clamps. Secure blade in
jaws with the clamp handles.
3. Quickly press and release (“jog”) the anneal
button (Figure 15). Repeat jog process until
you see a slightly red glow from weld area.
Do not press and hold the
anneal push button. The weld will be
overheated and will fail due to excessive
heat.
4. Release both blade clamps, allow blade to
cool, then remove blade from clamps.
5. Check weld integrity. Bend blade to form a
radius at point of weld. The size of the radius
should be approximately the same as radius of
band saw drive wheel. The weld must hold and
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