operation (continUeD)
Blade mounting
Refer to Figure 5, page 5.
Clean welder jaw of any scale, oil, rust or dirt. Clean blade ends
which contact welder jaws to provide proper electrical contact.
Set weld pressure adjustment knob to "0" (released). Insert one
end of blade into stationary jaw with teeth facing out and blade
end centered between jaws.
Firmly seat back of blade against back alignment surface of welder
jaw and clamp blade tight with the jaw clamping handle (See
Figure 5).
Insert other end of blade into movable jaw; butt the blade ends
together and clamp tight.
IMPORTANT: The blade ends should butt against each other over
the full width of the blade and should not overlap (See Figure 5).
tooth spacing
Refer to Figure 6.
Approximately 1/8” of blade will be consumed during the welding
process. This blade loss must be taken into account.
All blades must have some of the teeth ground off so that the
tooth spacing will be uniform after welding.
Tooth grinding procedure must be done carefully in order to grind
the proper number of teeth and not to grind below gullet which
would weaken the blade.
Blade Welding
Refer to Figures 3 and 7.
To set weld pressure adjustment knob, turn the knob counter -
clockwise to increase the pressure. The pressure adjustment knob
controls force applied to the movable jaw.
NOTE: Weld pressure adjustment knob must be reset to “0” after
each welding.
Wider blades and thicker blades need more weld pressure to force
the blade ends together during welding. If too little pressure is
applied, the blade ends will melt. Too much pressure may cause
the blades to overlap.
For example, for 1/2" wide blades, turn the pressure adjustment
knob counterclockwise until the pointer is at 6 (See Figure 7).
If blade melts, increase pressure. If there are "blow holes" in the
weld, increase pressure. If blade overlaps, decrease pressure. Wider
blades need more pressure and thinner blades need less pressure.
Weld pressure is also affected by blade material.
Welding operation produces sparks at blade
intersection. Step away to left side of welder
during welding operation.
5
figure 5 – Blade mounting and clamping
Correct – Grind blades square and clamp straight
Correct – Clamp blades flat with no overlap
Incorrect – Blades clamped at angle
Incorrect – Blades not ground square
Incorrect – Blades overlap
figure 6 – tooth spacing (tpi = teeth per inch)
4TPI
6TPI
8TPI
10TPI
20TPI
12TPI
16TPI
1/4 Tooth
3/8 Tooth
1/2 Tooth
5/8 Tooth
1¼ Tooth
3/4 Tooth
3/4 Tooth
figure 7 – Weld pressure adjustment
0
1
2
3
4
5
6
7
8
9
