10-14.Weld Test; 10-15.Troubleshooting - Porosity; 10-16.Troubleshooting - Excessive Spatter - Miller Maxstar 300 DX Owner's Manual

10-14. Weld Test
3
2 To 3 in
(51-76 mm)
1/4 in
(6.4 mm)
10-15. Troubleshooting – Porosity
Possible Causes
Arc length too long.
Damp electrode.
Workpiece dirty.
10-16. Troubleshooting – Excessive Spatter
Possible Causes
Amperage too high for electrode.
Arc length too long or voltage too high.
2 To 3 in
(51-76 mm)
2
2
1
Porosity – small cavities or holes resulting from gas
pockets in weld metal.
Reduce arc length.
Use dry electrode.
Remove all grease, oil, moisture, rust, paint, coatings, slag, and dirt from work surface before
welding.
Excessive Spatter – scattering of molten metal particles
that cool to solid form near weld bead.
Decrease amperage or select larger electrode.
Reduce arc length or voltage.
1 Vise
2 Weld Joint
3 Hammer
Strike weld joint in direction shown.
3
A good weld bends over but does
not break.
1
Corrective Actions
Corrective Actions
S-0057-B
OM-2222 Page 71