Finned tubes require long-term operation under high temperature flue gas conditions and should have high performance targets. One of the earliest methods of processing finned tubes is to pre-process a batch of individual fins with a punch, and then manually or mechanically, at a certain distance, and the fins are placed on the outer surface of the tube by interference. Because of the simple process and low technical requirements, the equipment used is inexpensive and easy to maintain, so many factories are still in use. This process is a labor-intensive process solution suitable for the capital and technical conditions of small or medium-sized enterprises.
The aluminum tube is extruded from pure aluminum or aluminum alloy into a metal tubular material which is hollow along its longitudinal length. It may have one or more closed through holes, and the wall thickness and cross section are uniform, in a straight line or in a roll. Delivery. The aluminum tube is a high-strength hard aluminum which can be heat-treated and strengthened. It has moderate plasticity in annealing, quenching and hot state, and has good spot weldability. The aluminum tube has a tendency to form intergranular cracks during gas welding and argon arc welding. Aluminum tubes are widely used in automobiles, ships, aerospace, aviation, electrical appliances, agriculture, electromechanical, household and other industries.