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Company news about YUHONG GROUP - Fin tube performance and inspection

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YUHONG GROUP - Fin tube performance and inspection

2025-03-06

YUHONG GROUP - Fin tube performance and inspection

 

The main factors affecting the heat transfer performance of the finned tube are: ① welding strength; ② welding bonding rate; ③ finning ratio; ④ fin and tube material matching; ⑤ fin type and geometry; ⑥ ash accumulation; ⑦ flue gas flow rate and so on. Among them, ③ to ⑦ items by the process design calculations to determine the focus here on the finned tube welding quality and inspection.
Fin welding welding rate of high and low, good and bad quality, directly affect the strength of the fins and fins heat transfer performance; welding rate is low, the weld strength is reduced, the thermal resistance of the finned tube increases, the heat transfer coefficient is reduced. Judge the welding rate of good and bad, commonly used inspection method is to scrape the sound method, that is, with a piece of steel, scraping the welded fins, if you hear a crisp, uniform and consistent ‘when when’ sound, indicating that the quality of welding is good, the fin welding rate is high; if you hear an uneven ‘cha-cha-cha’ sound, indicating that the welding quality is not good, there is no welded fins, the fins are not good. Indicates that the welding quality is not good, not welded. This method is only based on experience, from the macro-qualitative judgement of the good and bad fin welding; quantitative inspection of the welding rate of good and bad method is one by one peeling inspection, that is, at the end of each finned tube welded more than 2 to 3 laps, and will be more welded fins peeled off for quantitative checking, set the length of the weld for La, the weld width of the Sa. Lt, St are peeled off the theoretical length and the width of the fins, then the welding rate Φ is calculated by the formula: Φ=(La×Sa)÷(Lt×St)×100%, in which the measurement of La and Sa is subject to the grey and white metal on the connecting surface, and Sa is the average value of every 120 measurements, and the standard requirement of Φ ≥ 97% of the welding adhesion rate.

 

latest company news about YUHONG GROUP - Fin tube performance and inspection 0

 

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Company news about-YUHONG GROUP - Fin tube performance and inspection

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YUHONG GROUP - Fin tube performance and inspection

2025-03-06

YUHONG GROUP - Fin tube performance and inspection

 

The main factors affecting the heat transfer performance of the finned tube are: ① welding strength; ② welding bonding rate; ③ finning ratio; ④ fin and tube material matching; ⑤ fin type and geometry; ⑥ ash accumulation; ⑦ flue gas flow rate and so on. Among them, ③ to ⑦ items by the process design calculations to determine the focus here on the finned tube welding quality and inspection.
Fin welding welding rate of high and low, good and bad quality, directly affect the strength of the fins and fins heat transfer performance; welding rate is low, the weld strength is reduced, the thermal resistance of the finned tube increases, the heat transfer coefficient is reduced. Judge the welding rate of good and bad, commonly used inspection method is to scrape the sound method, that is, with a piece of steel, scraping the welded fins, if you hear a crisp, uniform and consistent ‘when when’ sound, indicating that the quality of welding is good, the fin welding rate is high; if you hear an uneven ‘cha-cha-cha’ sound, indicating that the welding quality is not good, there is no welded fins, the fins are not good. Indicates that the welding quality is not good, not welded. This method is only based on experience, from the macro-qualitative judgement of the good and bad fin welding; quantitative inspection of the welding rate of good and bad method is one by one peeling inspection, that is, at the end of each finned tube welded more than 2 to 3 laps, and will be more welded fins peeled off for quantitative checking, set the length of the weld for La, the weld width of the Sa. Lt, St are peeled off the theoretical length and the width of the fins, then the welding rate Φ is calculated by the formula: Φ=(La×Sa)÷(Lt×St)×100%, in which the measurement of La and Sa is subject to the grey and white metal on the connecting surface, and Sa is the average value of every 120 measurements, and the standard requirement of Φ ≥ 97% of the welding adhesion rate.

 

latest company news about YUHONG GROUP - Fin tube performance and inspection 0

 

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