ASNT Level III- Visual & Optical Testing
My Level III Self Study Notes Reading 4 Section 4B
My Level III Self Study Notes Reading 4 Section 4B
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6.3.5 Monitoring Fabric Seam Temperature<br />
In the making of specialized cloth (protective clothing, aerostat balloons),<br />
seam integrity is an important manufacturing function. A good radiofrequency<br />
seal can be achieved on a given fabric substrate only within a specific<br />
temperature range, determined by the minimum temperature needed to<br />
ensure a complete seal and the maximum temperature possible before<br />
material degradation. Constant temperature control and verification are<br />
required. This can be achieved using temperature sensitive strips (one for the<br />
upper limit, one for the lower limit) applied to the sealing tape used in<br />
production. A visual test of each seam after sealing indicates whether the<br />
seam temperature was within the required range, allowing visual verification<br />
of conditions for all dielectric seams.<br />
Charlie Chong/ Fion Zhang