Welded Blade Inspection - Jet VBS-2012 Operating Instructions And Parts Manual

15.3 Welded blade inspection

Table 3
Trouble
Weld is misaligned.
Misaligned weld: Blade
ends are overlapped.
Weld breaks when
used.
Incomplete weld.
Brittle weld.
Probable Cause
Dirt or scale on clamp jaws or blade.
Blade ends not square.
Blade ends not correctly aligned when
clamped in jaws.
Worn clamp jaws
Clamp jaws not aligned correctly.
Pressure knob is set for wider blade
than the one used.
Blade ends or clamp jaws not aligned
correctly.
Weld is weak and incomplete; possible
"blow holes" (see Figure 16).
Weld has been ground too thin.
Weld incorrectly annealed.
Pressure knob not set correctly.
Improper clamping procedures.
Limit switch not adjusted correctly.
Defective limit switch; doesn't break
circuit at end of welding operation.
Clamp jaw movement obstructed by
kinked jaw cable or tangled wires.
Incorrect annealing heat.
Scale or oil on weld caused poor
annealing.
Remedy
Always keep jaws clean. Clean blade
before welding.
Before welding, grind cut edges of
blade until they are square. Use the
shear on the band saw for square cuts.
Align ends properly before clamping.
Replace clamp jaws.
Align jaws correctly.
Adjust pressure knob correctly for
particular blade width.
Make corrections as needed.
Cut and re-weld blade ends.
Cut and re-weld blade ends.
Follow annealing instructions in section
12.4.
Make appropriate adjustment
Use proper procedures. See section
12.0.
Adjust limit switch correctly.
Replace limit switch.
Bend cable and untangle wires.
Bring weld up to correct color. See
section 12.4
Keep clamp jaws and blade clean.
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