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3-18. Weld Test
1
Vise
2
Weld Joint
3
Hammer
Strike the weld joint in the direction
shown. A good weld bends over but
does not break.
If the weld breaks, examine it to de-
termine the cause.
If the weld is porous (many holes),
the arc length was probably too
long.
If the weld contains bits of slag, the
arc may have been too long or the
electrode was moved incorrectly
which allowed molten slag to be
trapped in the weld. This may hap-
pen on a V-groove joint made in
several layers and calls for addi-
tional cleaning between layers.
If the original beveled surface is vis-
ible the material was not fully melted
which is often caused by insufficient
heat or too fast a travel speed.
S-0057-B
2 To 3 in.
1/4 in.
3
2
1
2 To 3 in.
3
2
1
(51-76 mm)
(6.4 mm)
(51-76 mm)
SECTION 4
−
WELDING TROUBLESHOOTING
4-1. Porosity
Porosity
−
small cavities or holes
resulting from gas pockets in weld
metal.
Possible Causes
Corrective Actions
Arc length too long.
Reduce arc length.
Workpiece dirty.
Remove all grease, oil, moisture, rust, paint, coatings, slag, and dirt from work surface before welding.
Damp electrode.
Use dry electrode.
