High frequency welded spiral fin tube use high frequancey resistance welding method which is developed in the early 1950s and gradually mature during 1970s and 1980s.Because the fin tube heat transfer area is larger, higher heat transfer efficiency, low pressure drop, so the gas stove and the oil - gas mixture heating furnace, the comprehensive heat transfer performance is much better than the same specification and material of ordinary heat exchange tube, pin tube. More and more heat exchange equipment use this kind of fin tubes as core components used in power, chemical fertilizer, chemical industry and refining equipment. Since the early 1980s, the Maoming petrochemical machinery plant developed and produced fin tubes. With the continuous improvement of fin tube production technology and production equipment technology, more kinds of fin tubes are produced. No matter from the type of products, quality, or in the production capacity, have reached the leading level in domestic. The tensile strength of welded joints and welding important quality indicators have reached or exceeded the rate of domestic "technical conditions" of high frequency resistance welding of spiral fin tube (API) and foreign professional standards, has become the domestic leading manufacturer. In the process of production, various types of fin tubes were examined and tested accordingly. In this paper, throught analyed welding quality of SA335 P91 heat resistant steel pipe and 0Cr13 steel strip,to better develop and popularize this kind of products.
The high frequency welded spiral fin tube is steel strip wound on the outerside of seamless tube (steel strip perpendicular to the outer surface of the pipe)) to high-frequency current for welding heat, the use of high-frequency current skin effect and electric effect, Local heating steel pipe and the contact surface of the steel and the area to be welded, so that the contact surface to plastic solderable state, while the outside of the application of the top of the fin force will contact the metal oxide, local melt and the excess plastic metal extrusion , So that between the steel pipe and the fin material to achieve the combination of solid atoms, in order to achieve the contact surface of the plastic welding.
(Mm) 2 ~ 10 Welded steel pipe length (m) 0.5 ~ 15 Weldable fin width (mm) 13 ~ 30 Can Welding fin thickness (mm) 0.8 ~ 2.5 fin spacing (mm) 4 ~ 90
Typical spiral finned tube welding equipment Performance parameters: Φ25 Fin tube steel pipe thickness (mm) 2-3 Welded steel pipe length (m) 0.5 ~ 15 Weld fin width (mm) 10 ~ 15 Weld fin thickness ( Mm) 0.8 ~ 2.5 fin spacing (mm) 4 ~ 10
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