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The fact that current aluminum tubes are manufactured using a traditional combined die welding and extrusion process means that weld lines cannot be avoided entirely, particularly after oxidation has occurred in the tube. Using a short round bar in conjunction with a high temperature and slow extrusion process, the finished product is produced by extrusion manufacturing in the first place. Maintaining control over three different temperatures at the same time requires meticulous cleanliness. The aluminum rod, the extrusion tube, and ... more