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ASNT Level III- Visual & Optical Testing

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

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