Jet Tools VBS-3612 operating instructions Troubleshooting Welded Blade Inspection

Troubleshooting – Welded Blade Inspection

Trouble

Weld is misaligned.

Misaligned weld: Blade ends are overlapped.

Weld breaks when used.

Incomplete weld.

Brittle weld.

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

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