SURELOK MANUAL 2002
19
TESTING JOINT STRENGTH:
1)
The best method of testing joint strength is to pull the joint apart in both pull and peel
and measure the force required with a pull tester.
2)
In production however an indication of the joint strength can be found by measuring
the diameter of the button cap (the "mushroom") on the die side of the joint.
3)
If a joint is tested in pull and peel with a pull tester and the upper and lower limits of
joint strength are found, the cap diameters for these two limits can be measured.
Calipers or a GO - NOGO gauge can then be used in production to see if the cap
diameter is within the measured limits.
NOTE!
a)
If the material changes or the die # is changed the cap
diameters will change.
b)
When using the button cap diameter shear and peel tests should also
be used occasionally to confirm strengths.
MAX
C
hecking Button Cap Dia
TOLERANCE GAUGE
MIN
With a Caliper
Good Joint
Not Acceptable
PULL AND PEEL TESTING. TESTING BUTTON CAP DIAMETER.
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