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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Another example of handforrning is known as a full wrap.<br />
In this application, the core is positioned over radiant heaters<br />
with temperature indicating stripes painted on the adhesive<br />
in the area of the radius. When the melt indicates forming<br />
temperature has been reached, the assembly is moved back<br />
onto a flat supporting surface. The wrapping action uses the<br />
flat surface as a pressure point.<br />
An example of mechanical postforming is the roll forming<br />
machine. Radiant heaters are located above an assembly<br />
supported by a moving carrier. When the forming temperature<br />
has been reached, slanted forming bars wipe the laminate<br />
over the radius. After the laminate has been formed, a<br />
succession of rollers maintains pressure until the assembly<br />
has cooled. In this application, temperature sensitive liquid<br />
is painted onto the laminate in order to verify that the dwell time under heat<br />
has been sufficient for reaching forming<br />
temperature.<br />
Charlie Chong/ Fion Zhang
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