Jasic ARC PFC Series User Manual

19
MMA WELDING PROBLEMS
Before starng any welding acvity ensure that you have suitable eye protecon and
protecve clothing. Also take the necessary steps to protect any persons within the welding
area.
Arc welding defects and prevenon methods
Defect Possible cause Acon
Excessive spaer (beads of metal
scaered around the weld area)
Amperage too high for the
selected electrode
Reduce amperage or ulise larger
diameter electrode
Voltage too high or arc length
too long
Reduce arc length or voltage
Uneven and errac weld bead and
direcon
Weld bead is inconsistent and
misses joint due to operator
Operator training required
Lack of penetraon – The weld bead
fails to create complete fusion
between material to be welded,
oen surface appears okay but weld
depth is shallow
Poor joint preparaon
Insucient heat input
Poor weld technique
Joint design must allow for full access
to the root of the weld
Material too thick
Increase the amperage or
increase the electrode size
and amperage
Reduce travel speed
Ensure the arc is on the
leading edge of the weld puddle
Porosity – Small holes or cavies on
the surface or within the weld
material
Work piece dirty
Electrode is damp
Arc length is excessive
Remove all contaminant from the
material i.e. oil, grease, rust, moisture
prior to welding
Replace or dry the electrode
Reduce the arc length
Excessive penetraon – The weld
metal is below the surface level of
the material and hangs below
Heat input too high
Poor weld technique
Reduce the amperage or use a smaller
electrode and lower amperage
Use correct welding travel speed
Burning through – Holes within the
material where no weld exists
Heat input too high Use lower amperage or smaller
electrode
Use correct welding travel speed
Poor fusion – Failing of weld material
to fuse either with the material to be
welded or previous weld beads
Insucient heat level
Poor welding technique
Work piece dirty
Increase the amperage or increase the
electrode size and amperage
Joint design must allow for full access to
the root of the weld
Alter welding technique to ensure
penetraon such as weaving, arc
posioning or stringer bead technique
Remove all contaminant from the
material i.e. oil, grease, rust, moisture
prior to welding

Jasic ARC PFC Series Specifications

General

Brand	Jasic
Model	ARC PFC Series
Category	Welding System
Language	English