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21A
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WELD ASSESSMENT/TESTING
Visual examination of weld quality can, even with limited experience, provide a
useful quality assessment. In such a check the presence of a small even witness of
weld material around the base of the stud flange after welding should be ensured.
Poor welds are indicated by excess metal on one side of the welded flange and / or
the presence of an undercut or non
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fused area between the stud flange and the
parent sheet or plate. Incorrect settings, adverse magnetic effects etc. such as those
at edge welding positions or with unbalanced earths and studs welded to the work
piece at an angle, the controller and pistol should be examined with a view to
correcting such defects.
MECHANICAL TESTS :
BENDING.
The most easily applied method of testing the quality of welded fasteners
considered here, involves the use of a bending bar. This bending bar (available from
your supplier, see the accessories section of this manual) fitted with the correct size
of nozzle for the stud to be tested is used to bend over the stud in accordance with
the BS EN 14555:2014 specification .
TORSION.
A torsion test provides useful information for threaded fasteners. This involves
tightening a nut on the stud against a spacer, suitably relieved to cater for the
flange and weld spatter. For quantitative assessments a suitably calibrated torque
wrench may be used, but at its simplest, a spanner will suffice.
In the above tests the performance of the welded joint should be considered in
relation to the thickness of the material to which the stud is welded. On thicker
materials, a full strength weld is denoted by deformation or failure of the stud
shank. On lighter gauge material, severe "dimpling" or "dishing" at the reverse to
the weld side normally indicates sufficient strength, whilst in most cases, the
tearing of a slug of material from the parent sheet will occur.
Содержание M8
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