Forming a Double Twist
The composite is made of a bundle of rods welded together at the ends. However much care is taken with the heating the twist is very likely to form uneven. As soon as it becomes noticeable pour water on those parts which are twisting too much, to cool them. Sometimes a twist back is necessary. In this case the parts which are not over twisted are cooled, so that they are not affected as the bar untwists.
