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我厂在锅炉蛇形管的制造中,已采用了闪光对焊(图1),本文叙述了在试验和试生产过程中的一些经验及体会。图1 管子闪光对焊时的情景锅炉蛇形管包括过热器和省煤器,它们都处在高压水和蒸汽的循环下,加热温度高达280～490℃(指中压锅炉的过热器)。在这种情况下运转的管子,除了对管子的焊接接头要能满足机械性能以外,更重要的是必须保证接头的金相要求,并要有一定的通径。我们试生产的蛇形管有:Φ32/26和Φ38/31的20号钢管及Φ42/35的15XM钢管,经过机械性能试验,极限强度和弯曲角度都达到了甚至超过了要求的标准。图2是拉力试样的加工图。
I plant in the manufacture of the boiler serpentine, has adopted the flash butt welding (Figure 1), this article describes the trial and pilot production process of some experience and experience. Figure 1 pipe flash butt welding scenarios Boiler serpentines, including superheater and economizer, they are in high pressure water and steam cycle, the heating temperature up to 280 ~ 490 ℃ (refers to the pressure boiler superheater). Pipe running in this case, in addition to the pipe welded joints to meet the mechanical properties, more importantly, the joint must ensure the metallurgical requirements, and have a certain path. Our trial production of serpentine tubes are: Φ32 / 26 and Φ38 / 31 of 20 and Φ42 / 35 of 15XM steel pipe, after the mechanical test, the ultimate strength and bending angle reached or even exceeded the required standard. Figure 2 is a drawing of the tensile test specimen.