1、 Basic Definition
It is a flat heat exchange tube formed by resistance high-frequency solid-state welding technology, which is compressed into a flat cavity with steel strip/aluminum alloy strip. Multiple independent microchannels are formed inside the tube with integrated partition ribs. The weld seam is metallurgically fused through resistance heat and mechanical pressure. It is the core heat exchange element of parallel flow and fin heat exchangers, with high pressure resistance, high weld seam strength, and efficient heat exchange.
2、 Core production process
Continuous steel strip is rolled into flat tube blanks, and high-frequency current is passed through the joints to generate resistance heat, which is then combined with extrusion to complete wire free resistance welding; The inner cavity partition ribs are synchronously welded to the pipe wall as a whole, without segmented splicing gaps. The entire process is continuously automated, and the weld seam bonding rate can reach 95% to 98% or more.
3、 High intensity core advantage
High mechanical strength of welds
Solid phase fusion has no virtual welding or porosity, and its shear and peel strength is 3-5 times that of ordinary brazed flat tubes. It can withstand high-pressure refrigerant and fluid impact, and is less prone to cracking and leakage under cold and hot cycling conditions, greatly improving its pressure bearing capacity.
Overall structural pressure resistance and stability
Internally integrated wave/straight partition ribs support the pipe wall in both directions, and the multi-layer pipe wall structure evenly distributes pressure, avoiding local stress short plates and adapting to medium and high pressure heat exchange systems.
Stronger sealing and corrosion resistance
No residual filler flux, no gaps in welds, and no crevice corrosion; The stainless steel/3 series aluminum material version can adapt to high temperature and corrosive medium working conditions, with a longer service life.
4、 Heat transfer performance characteristics
Flat cross-section increases the heat transfer area on the air side, and multiple microchannels inside enhance fluid turbulence, resulting in better heat transfer efficiency than circular tubes; The tube body is thin and uniform, with extremely low thermal resistance; The flat surface of the flat tube facilitates a tight fit with the fins, resulting in a compact overall heat exchanger structure, smaller volume, and lower wind resistance.
5、 Common materials and application scenarios
Material: 3003 aluminum alloy (for automotive air conditioning and heat pumps), 304/316L stainless steel (for industrial waste heat and chemical heat exchange), carbon steel (for steam and drying equipment);
Applicable: High pressure and frequent alternating heat exchange equipment such as parallel flow coolers for automobiles, heat pump cooling and heating exchangers, industrial flue gas waste heat recovery, chillers, cabinet cooling, and new energy thermal management.
