Troubleshootin - Saf-Fro PRESTO 300MV Instrucciones De Uso Seguridad Y Mantenimiento

8 - TROUBLESHOOTING
This chart will assist you in resolving common problems you may encounter in welding; for electrical faults see (Tab.3 – Section 6.2.)
PROBLEM
Porosity:
small cavities or holes resulting from gas
pockets in weld metal.
Excessive spatter:
scattering of molten metal particles that cool to
solid form near weld bead.
Incomplete Fusion:
failure of weld metal to fuse completely with
base metal or a proceeding weld bead.
Lack of penetration:
shallow fusion between weld metal and base
metal.
Excessive penetration:
weld metal melting through base metal and
hanging underneath weld.
Waviness of bead:
weld metal that is not parallel and does not
cover joint formed by base metal.
Distortion:
contraction of weld metal during welding that
forces base metal to move.
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TROUBLESHOOTING
POSSIBLE CAUSES
Arc length too long.
Damp electrode.
Work piece dirty.
Amperage too high for electrode.
Arc length too long or voltage too high.
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Improper welding technique.
Work piece dirty.
Improper joint preparation.
Improper weld technique.
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Excessive heat input.
Unsteady hand.
Excessive heat input.
EN-13
CORRECTIVE ACTIONS
Reduce arc length.
Use dry electrode.
Remove all grease, oil, moisture, rust, paint,
coating and slag from work surface before
welding.
Decrease amperage or select larger electrode.
Reduce arc length or voltage.
Increase amperage. Select large electrode and
increase amperage.
Adjust work angle or widen groove to access
bottom during welding.
Momentarily hold arc on groove side walls when
using weaving technique.
Keep arc on leading edge of weld puddle.
Remove all grease, oil, moisture, rust, paint,
coating and slag from work surface before
welding.
Material too thick. Joint preparation and design
must provide access to bottom of groove.
Keep arc on leading edge of weld puddle.
Increase amperage. Select large electrode and
increase amperage.
Reduce travel speed.
Select lower amperage. Use smaller electrode.
Increase and maintain steady travel speed.
Use two hands. Practice technique.
Use clamps to hold base metal in position.
Make tack weld along joint before starting
welding operation.
Select lower amperage for electrode.
Increase travel speed.
Weld in small segments and allow cooling
between welds.
EN