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用高频焊由光管加扁钢制成的鳍片管,由于鳍片是矩形的,特别对于宽节距的鳍片管,目前国内还没有这种规格鳍片管的壁温线算图。另外,高频焊缝的上、下表面不可避免地要有0.6毫米左右的漏焊缺口,即使采用手工填焊和埋弧自动焊有时也不能全焊透。为了弄清这些缺陷对壁温的影响,并给出这种规格鳍片管的壁温线算图;同时为了校核
The use of high-frequency welding tube flat tube made of flat steel tube, the fins are rectangular, especially for the wide-pitch fin tube, the current domestic norms of the fin tube wall temperature calculation diagram . In addition, the upper and lower surfaces of the high-frequency welding seam inevitably have to about 0.6 mm drain gap, even with manual welding and submerged arc welding sometimes can not fully penetration. In order to clarify the impact of these defects on the wall temperature, and given the specifications of the fin tube wall temperature calculation diagram; at the same time in order to check