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VISUAL WELD INSPECTION
This page will help you to recognise a poor weld when you see one and give some of the
possible explanations as to how it may have occurred. Your test welds should look like the
first example diagram in the series and once you transfer to the actual job, periodic checks
should be made to ensure that your welding is consistently good.
POINTS TO LOOK FOR IRRESPECTIVE OF PROCESS USED.
•
L.A.W. (Length After Welding). This should be correct to within + 0 / - 1 mm.
•
The base fillet of the welded stud is complete.
•
The welded stud is perpendicular to the work-piece.
WHEN USING A CERAMIC FERRULE.
This diagram is an example of a good normal weld, fulfilling the criteria above i.e. The
LAW is correct, the stud has a complete, well formed and even fillet and is also
perpendicular to the work-piece.
The following examples will help you to recognise the most common types of poor
weld, explain the possible causes of these problems and how to remedy them.
EXAMPLE 1
PROBLEM :
Insufficient heat, causing the L.A.W. to be too long and the fillet to
be underdeveloped and/or incomplete.
REMEDY :
Increase the welding time (see page 12).
EXAMPLE 2
PROBLEM :
Excessive heat, causing the L.A.W. to be too short and the fillet to be
too large and messy, spreading out under the ferrule and/or
splashing up the threads.
REMEDY :
Reduce the welding time (see page 12).
EXAMPLE 3
PROBLEM :
The ferrule is not being held firmly against the work-piece and/or
the stud is binding against the ferrule.
REMEDY :
Hold the pistol firmly down to the work-piece (see page 14) and
reset the alignment of the stud and ferrule (refer to your pistol
setup guide).
EXAMPLE 4
PROBLEM :
Insufficient stud protrusion set on the pistol and/or the stud is
binding against the ferrule.
REMEDY :
Adjust stud protrusion to correct setting (refer to your pistol setup
guide).
EXAMPLE 5
PROBLEM :
Poor alignment i.e. stud is not perpendicular to the work- piece.
REMEDY :
Hold the pistol perpendicular to the work-piece (see page 14).
NOTE
:
If the misalignment is only slight and in all other aspects the weld is
good, then the weld may be salvaged by tapping straight with a soft
mallet.
15
✓
V-21A
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