The Effect of the Welding Technology on the Thermal Performance of Welded Finned Tubes Used in Heat Exchangers

Due to the use of welded finned tubes in heat exchangers, gas blocks are characterized by very good electric energy production performance, and their reliability can reach 98%. Finned used exchangers usually welded. Such should be characterised following properties: high thermal resistance high-temperature corrosion a flue atmosphere, appropriate joint strength hardness. The most popular technology for welding is MAG. MAG-welded joints considerable spattering, weld discontinuities (up 60%), non-axial fin alignment. irregularities result considerably reduced flux due transfer occurring joint. It has been shown that with 20%, performance reduces considerably. This paper proposes possibility laser. properties laser-welded were compared those tubes. was found three times higher than plain However, not affected technology. correct flow at level 95% occurs tube/fin even penetration 0.01 mm, however, absence metallic continuity results drastically (by 50%) overheating fins, which affects durability.