Radiators and heat exchangers need airtight, clean welding seams. Traditional flux brazing leaves residues and hidden leakage risks. Rexin flux-free vacuum brazing furnaces form seamless joints. We provide batch and continuous lines for aluminum, copper and stainless steel exchangers.

Automotive radiators, refrigeration evaporators and industrial heat exchangers are core heat exchange components, requiring extremely high welding airtightness, surface finish and heat conduction stability. The main failure cause of heat exchange products in the market comes from traditional flux brazing process defects: welding pores, virtual welding, flux residue corrosion and long-term liquid leakage. Most manufacturers adopt traditional flux-assisted brazing, which requires secondary cleaning and pickling, resulting in high labor cost, low production efficiency and unstable product quality. Residual flux will gradually corrode welding seams during long-term operation, leading to product failure, increased after-sales maintenance rate and damaged brand reputation.

Rexin focuses on heat exchanger brazing technology research and development for many years, launching professional flux-free vacuum brazing furnaces and continuous mesh belt brazing production lines. Abandoning the traditional flux auxiliary process, we realize oxygen-free vacuum integrated brazing forming. Through precise temperature control and vacuum degassing technology, we eliminate welding pores and virtual welding defects, form dense and seamless welding seams, and achieve permanent zero leakage of heat exchange components. Our equipment supports both small-batch customized production and large-scale continuous mass production, helping manufacturers produce high-airtight, high-heat-conduction and high-durability heat exchanger products and solve core quality pain points fundamentally.

1. Welding pore & long-term liquid/gas leakage Traditional flame brazing and ordinary furnace brazing have insufficient gap filling ability, and internal welding pores and virtual welding are inevitable. After long-term heat-cold cycle operation, tiny gaps expand and cause leakage. Rexin high-vacuum brazing environment promotes full penetration and filling of brazing filler metal in assembly gaps, forms dense seamless welding layers, and achieves permanent zero leakage under standard working pressure.

2. Flux residue corrosion & reduced service life Chemical flux residue is easy to absorb moisture and oxidize, corroding welding joints, damaging heat exchange structure and reducing product heat conduction efficiency and service life. Our full flux-free brazing process completely eliminates residual pollution and corrosion risks, ensuring long-term stable operation of heat exchange components.

3. Complex post-processing & high comprehensive cost Traditional brazed workpieces have oxidized surface and flux residue, requiring pickling, polishing and manual cleaning, consuming a lot of labor and time costs. Vacuum flux-free brazing realizes one-time bright forming of workpieces with smooth and clean surface, no secondary processing required, greatly reducing comprehensive production costs.

4. Unstable batch welding quality Manual welding and ordinary furnace heating have uneven temperature and atmosphere, leading to inconsistent welding seam firmness and airtightness of batch products. Our intelligent closed-loop control system realizes synchronous adjustment of temperature and vacuum degree, ensuring 100% consistent batch welding quality.

Flux-Free Energy-Saving Process: Eliminate flux consumable costs and post-cleaning process costs, reduce overall production expenditure by 20%-25% compared with traditional processes.

360° Full Uniform Temperature Field: No heating dead angle inside the furnace, completely avoid virtual welding and missing welding, ensure full compactness of all welding seams.

Efficient Vacuum Degassing Technology: Thoroughly remove internal air and tiny impurities of workpieces, improve product pressure resistance and airtightness, and eliminate hidden leakage dangers.

Dual Flexible Production Modes: Independent batch vacuum furnaces for small-batch, multi-specification customized products; continuous mesh belt production lines for large-scale standardized mass production, fully adapting to different customer order needs.

Airtightness, stability and durability are the core competitiveness of heat exchanger products. Traditional flux brazing process has inherent defects such as residue corrosion and easy leakage, which cannot meet the high-standard manufacturing requirements of high-end heat exchange components. With mature flux-free vacuum brazing technology and stable equipment performance, Rexin fundamentally solves industry pain points such as welding leakage, surface oxidation and unstable batch quality. We customize exclusive equipment and production lines according to customer workpiece size, material and output requirements, providing one-stop technical solutions for heat exchanger manufacturers to improve product qualification rate and market competitiveness.

Plagued by heat exchanger welding leakage, flux corrosion and low yield? Consult us for free professional process optimization & factory direct price.

Our Products: Mesh Belt Furnace, Vacuum Furnace, Box Furnace, Pit Nitriding Furnace, Brazing Line, Sintering Furnace

Related Application Industries: Heat Treatment Process, Hardware & Fasteners, Tooling & Cutting Tools, Stainless Steel Strip & Tube, New Energy Auto Parts, Powder Metallurgy, Heat Exchanger, Aluminum Alloy, Bearing Parts