U pitanju su čavli koji se zavaruju na neku metalnu konstrukciju i kojima se pričvršćuje izolacija. Pogledati poveznice:

ISO-PLUS: Used for perfect fastening of insulation mats with cupped head pins.

ISO-PLUS: : With this procedure you fasten the insulation mat in one process to the base material.

ISO-PLUS: Push the cupped head pin onto the chuck and push it through the mat – weld within 3 milli seconds !

ISO-PLUS: This fastening procedure using cupped head pins replaces the complicated former procedure: weld on a pin – push the mat over the pin – put on the clip – cut projecting tip or bend it.

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ISO-MAX cupped head pins are entirely made of stainless steel
and were specially developed for insulation used in building
construction.

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Insulation pins with clips are preferably used with pre-assemblies,
e.g. fire-protection mats or mats with wire meshing.
http://www.sudura.com/HBS/pdf/ISO-engl-180303.pdf

The welding process of ARC-insulation pin welding corresponds with short cycle drawn arc stud welding. (SC)
http://hbs-studwelding.com/iso.39.5