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28
Troubleshooting – Welded Blade Inspection
Trouble Probable Cause Remedy
Weld is misaligned.
Dirt or scale on clamp jaws or blade.
Always keep jaws clean. Clean blade
before welding.
Blade ends not square.
Before welding, grind cut edges of the
blade until they are square. Use the
shear on the band saw for square
cuts.
Blade ends not correctly aligned when
clamped in jaws.
Align the ends properly before
clamping.
Worn clamp jaws Replace clamp jaws.
Clamp jaws not aligned correctly. Align jaws correctly.
Misaligned weld:
Blade ends are
overlapped.
Pressure knob is set for wider blade
than the one used.
Adjust the pressure knob correctly for
particular blade width.
Blade ends or clamp jaws not aligned
correctly.
Make corrections as needed.
Weld breaks when
used.
Weld is weak and incomplete;
possible “blow holes” (see Figure 19).
Cut and re-weld the blade ends.
Weld has been ground too thin. Cut and re-weld the blade ends.
Weld is not annealed correctly.
Follow annealing instructions on page
18.
Incomplete weld. Pressure knob not set correctly. Make appropriate adjustment
Improper clamping procedures.
Follow instructions on pages 16
through 19.
Limit switch (#1, page 39) not
adjusted correctly.
Adjust limit switch correctly.
Defective limit switch; doesn’t break
circuit at end of welding operation.
Replace limit switch.
Clamp jaw movement obstructed by
kinked jaw cable or tangled wires.
Bend cable and untangle wires.
Brittle weld.
Incorrect annealing heat.
Bring weld up to correct color (see
page 18).
Scale or oil on weld caused poor
annealing.
Keep clamp jaws and blade clean.
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