Huvema VBS-2012H-CE, Operator'S Manual

Page: 21 / 33

- 20 -
MISALIGNED WELD
( 1) Dirt or scale on jaws or blade.
(2) Blade ends on cut off square.
(3) Blade ends not correctly aligned when clamped in jaws.
(4) Worn jaws or inserts.
(5) Jaws are not aligned correctly.
MISALIGNED WELD-BLADE ENDS ARE OVERLAPPED
(1) Jaw Upset Force Control set for wider blade than used, adjust correctly.
(2) Blade ends or jaws not aligned correctly.
WELD BREAKS WHEN USED
(Joint is not complete, “blow holes” in joint)
(1) Weld not annealed correctly.
(2) Weld has been ground too thin.
(3) Weak “Incomplete” Weld.
INCOMPLETE WELD
(1) Incorrect Initial Set-Up:
(a) Initial jaw gap (weld lever position) not set correctly.
(b) Upset Force Control not set correctly.
(2) Improper clamping procedures.
(3) Defective cut-off switch may not break the circuit at end of welding operation.
(4) Cut-off Switch not adjusted correctly.
(5) Points of Cut-off Switch welded together.
(6) Slide Rod sticking because of rust or dirt. Clean and oil the Rod.
(7) Slide Rod movement obstructed because the Stop Screw too tight on the Rod.
(8) Jaw movement obstructed by kindled jaw cable or tangled wires. Bend cable and untangle
wires.
BRITTLE WELDS
Weld has not been annealed correctly; see “Annealing” in Operation Chapter. Poor annealing can
be caused by:
1. Incorrect annealing heat. Bring weld up to correct color as described under “Annealing” in
WELDER OPERATE chapter.
2. Scale or oil on weld can cause poor annealing.