60 Wormholes
Wormholes are elongated or tubular cavities caused by excessive entrapped gas. Wormholes have the appearance of sharply defined dark shadows of rounded or elongated contour, depending on the orientation of the wormholes.
Wormhole porosity is considered the most severe type of porosity because it provides a leak path through the weld. This is especially serious when the vessel or pipe is intended to contain liquid.
Wormholes Prevention
Wormholes are prevented by methods that are similar to those that prevent porosity.