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c. Weld Width (WW): The center-to-center distance between the two welds of a dual-
track weld (refer to Figure 6A) or the edge-to-edge distance on a solid weld (refer to
Figure 6B). It is important when measuring/calculating these distances that the
operator only include the actual width of the weld. The width of the weld is defined
as only that area where the two sheets of parent material have been appropriately
bonded by both heat and pressure. During this process some parent material may
extrude beyond the pressure zone of the welding tool (refer to Weld Extrusion
definition). This extruded material does not usually provide an acceptable bond of
the parent material and should therefore be excluded from any measurements made
for this test.
d. Gauge Length (GL): This is the base value used by the Pro-Tester
elongation percentage. It is the Grip Separation once the initial tension value has been
reached minus the Weld Width (GS – WW = GL). For example if your Grip
Separation was 4 inches and your Weld Width was 1 1/2 inches then your Gauge
Length would be 2 1/2 inches (4 - 1.5 = 2.5). It is this value that is used to determine
elongation. Elongation is calculated as the percentage of change (increase) of the
Grip Separation related to Gauge Length. For example if your Gauge Length is 2 1/2
inches and the grips had separated 1 1/4 inches at the completion of your test then the
elongation would be 50% (1.25 / 2.5 = .50). If your Gauge Length is 2 1/2 inches and
the grips had separated 2 1/2 inches at the completion of your test then the elongation
would be 100% (2.5 / 2.5 = 1.00).
It is on this basis that the Pro-Tester
performing elongation testing.
Page 11
TM
has been designed and programmed to operate when
Figure 5.5
Rev. C, October 2020
TM
for determining
T-035 A M004
Pro-Tester Operator's Manual
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