In the field of high-temperature flue gas waste heat recovery, laser-welded finned tube heat exchangers offer a high-performance, cost-effective mid-to-high-end solution: They perfectly address the pain points of traditional high-frequency welded tubes, such as high-temperature weld failure, weld corrosion, ash buildup and blockage, and vibration failure, resulting in comprehensive improvements in heat exchange efficiency, operational stability, and service life. They are suitable for energy-saving retrofit projects in various industrial flue gas systems, including boilers, kilns, and incinerators. For extreme ultra-high temperature and high-wear conditions: integrally rolled finned tubes can be used; For medium-temperature clean flue gas and budget constraints: conventional high-frequency welded finned tubes can be used as an alternative.