Jet Tools VBS-3612 - Manual (Page 28)

28
Troubleshooting – Welded Blade Inspection
Trouble Probable Cause Remedy
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.
Weld is misaligned.
Clamp jaws not aligned correctly. Align jaws correctly.
Pressure knob is set for wider blade
than the one used. Adjust the pressure knob correctly for
particular blade width. Misaligned weld:
Blade ends are
overlapped.
Blade ends or clamp jaws not aligned
correctly.
Make corrections as needed.
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 breaks when
used.
Weld is not annealed correctly.
Follow annealing instructions on page
18.
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.
Incomplete weld.
Clamp jaw movement obstructed by
kinked jaw cable or tangled wires.
Bend cable and untangle wires.
Incorrect annealing heat.
Bring weld up to correct color (see
page 18).
Brittle weld.
Scale or oil on weld caused poor
annealing.
Keep clamp jaws and blade clean.