Sheathing, Aluminum

There are three basic methods of providing an aluminum sheathing on cables: 1) The cable core may be inserted into an oversize tube of aluminum that is then rolled or swaged so that it becomes a close fit on the cable core. 2) A tube is formed by folding aluminum strip around the cable core and jointing the edges either by pressure welding, argon-arc welding or induc­tion heating. 3) An aluminum sheath may be ex­truded directly over the cable core while heat is kept away from the core during extrusion.