For more than 25 years HE Tubing has been offering solutions to the automotive and HVAC-R industry. Throughout the years HE Tubing has built expertise, which is used constantly to improve our products. Research & Development is one of our main priorities. All our solutions originate from the same process steps, which you can find below. HE Tubing offers following solutions:
Micro Port Extrusion
The Micro Port Extrusion (MPE) is an extruded rectangular flat tube with multiple small channels running the length of the tube. The size range HE Tubing Netherlands is capable to extrude (and calibrate) is broad:
- Width: 6 – 40 mm
- Height: 1- 5 mm
- Wall Thickness: 0,1 – 0,6 mm
MPE’s are exceptionally capable of handling high pressure refrigerants and are manufactured to meet the customer’s specific requirements with respect to alloy, geometry, wall and web thicknesses. The geometric characteristics of MPE’s are achieved by extrusion. The typical walls of MPE’s are thin, which makes the choice of alloy critical with regards to corrosion resistance.
Additional corrosion protection can be provided to the tube through the use of one of the coating solutions from HE Tubing.
Main application of the MPE’s is the paralell flow heat exchanger such as condensers and evaporators.
Micro Port Extrusion for R744 / CO2
The introduction of new refrigerants for mobile air conditioning, in particular the change to CO2 (R-744) with its highly challenging technical operating conditions, asks for new aluminium solutions.
The condenser which is used in current air conditioning systems based on R-134a will be replaced by a CO2 (R-744) gas cooler. Multi Port Extruded aluminium for CO2 heat exchanger applications are developed to resist the high pressure of the CO2 system.
Aluminium heat exchanger Round Tubing at HE Tubing are directly extruded, coiled and delivered in “as extruded” temper.
Aluminium Round Tubing offers excellent corrosion resistance, high strength to weight ratio and adequate heat transfer properties. We offer internally enhanced (fins) and smooth walled Round Tubing to meet your unique requirements.
HE Tubing’s NEXCOR™ family of alloys provides documented material savings, especially when demanding forming processes are used.
- Superior mechanical properties in pre-brazed and post-brazed conditions
- Excellent corrosion behaviour compared to standard alloys
- Limited grain size growth after brazing due to finetuned alloy composition
All solutions originate from the same process steps. HE Tubing developed these process steps to perfection. It is even possible to customize every step for particular needs. This will create a unique solution for a unique situation.
Aluminium extrusion is a hot working process used to transform an aluminium wrought alloy into objects with a definitive cross-sectional profile for a wide range of uses. A pre-heated billet will be pressed through a shaping mould creating an endless profile. At each position of the extruded profile the cross-section will have the exact same geometry.
Following profile sizes are capable within HE Tubing:
Width: 4 – 88 mm
Height: 1 – 20 mm
Wall thickness: ≥ 0.1 mm
A Zinc layer applied during the extrusion step creates an extra corrosion protection. The electro-chemical behaviour of Zinc towards aluminium will protect the aluminium from corrosion. The sacrificial behaviour of the Zinc in the possible corrosion process will elongate the life time of the aluminium even more.
Zinc layers of 5-18 gr/m2 can be applied on the tube surface with the use of a twin wire electric arc spray process. The common tolerances of the zinc layer are ± 2 gr/m2.
All our MPE production is coiled “endless” immediate after extrusion. This level winding process of the MPE’s is at HE Tubing done with reel container systems, engineered for automatic and quick reel changes to optimize our production line productivity. Depending on the customer and the market, the MPE material is delivered directly on coils or it will get an additional sizing and cut to length treatment and is delivered in boxes of bundled MPE’s in cut to length condition.
Different coatings that contain fluxing materials, zinc components and/or braze components like silicon particles or aluminium/silicon particles belong also to the capabilities (product portfolio) at HE Tubing. The Flux coatings are applied on the MPE tube surface in a separate production process after extrusion and before sizing and cutting the MPE to the Customers end specifications. Flux coatings can eliminate the need for fluxing and flux stations at the heat exchanger manufacturer production lines.
Since 2011 has HE Tubing a flux coating line in operation. A multi strand “state of the art” coating line containing a very precise roll coater machine that has the ability to apply a consistent thin coating layer on the aluminium substrate. Depending on the type of coating, a layer thicknesses between 8 and 35 gram / m2 can easily be applied.
HE Tubing produces coated materials according customer specifications which means that for each individual semi finished product the paint mixture has been developed, which makes it possible to achieve the best coating quality combined with the highest productivity. HE Tubing is using the finest components available in the market place in order to make this possible.
HE Tubings laboratory is well equipped to carry out all kind of supporting analysis and investigations on new developed coatings as well on existing coating recipes. In our laboratory we have a “lab-coater” that makes it possible to apply all typical flux braze coatings on laboratory scale. With the use of our braze oven a copy of the customers braze cycle can be simulated. Adjacent to this, SWAAT tests and metallographic analysis can be carried out in our laboratory as well. More deep analysis e.g. mapping of the coating components can be done with our SEM-microscope equipment.
HE Tubing has developed several types of coatings and together with the existing and widely used recipes HE Tubing can offer coating solutions to cover most, if not all of the applications.
The benefits of the use of a flux or braze coating is related to costs and environmental issues.The use of an applied braze coating reduces the number of production steps compared to the traditional process.
The difference between the traditional system and the “braze coating” system.
The advantages in costs are due to elimination of process equipment, possibly better utilization of the braze furniture (stacking of heat exchangers during brazing), precisely applied coating amount (no spill due to overspray), hardly any uncontrolled contamination of fluxing components with the environment and the possibility to apply zinc enriched components in order to create a galvanic corrosion protection during the same process.
To meet customer specific requirements for the Micro Port Extrusions, an additional sizing and cut to length process is needed after extrusion. Through the years HE Tubing has invested strongly in the latest state-of-the-art Cut to Length equipment. HE Tubing is working with the latest available high speed cut-to-length machines, enabling us to produce at higher speeds, tighter tolerances with more power, shorter response times and greater flexibility in MPE design, maintaining highest quality.
An important challenge during design and brazing is to optimise the combination of the different materials of fin, Micro Port Extrusion (MPE) and header used in the heat exchanger.
Over the years, a strong down-gauging trend has been observed for the various automotive heat exchanger materials, answering the continuing pressure for weight and cost reduction. Downgauging, on the other hand, requires an improvement of the corrosion resistance of both the micro port extrusion and fin stock alloys. Air-side corrosion resistance has been ensured by the application of suitable pre-treatment and corrosion protection systems.
NEXCOR™ Long Life Alloys (LLA’s): superior extruded aluminium MPE’s and Round Tubing for Automotive and HVAC/R heat exchanger applications.
- Most highly corrosion resistant bare aluminium alloys – requiring no zinc arc spray or chromate coating to withstand intense environmentally corrosive conditions
- Extends high efficiency life cycle of heat exchangers – no tube-to-fin separation to degrade performance
- Durable and promotes a higher post-braze strength for a more stable microstructure
- Substantial cost saving over copper (HVAC/R applications) with a weight reduction of 40-50%
NEXCOR™ includes three highly engineered alloys: AA3026 (C47B), AA3110 (C19E) and C47D. Chemistries
of each are shown below, including a comparison with the industry standards AA1100 and AA3102.
With the introduction of highly corrosion resistant LLA’s for the MPE with optimized compositions like the EN AW-3110 NEXCOR™ alloy, it has been possible to eliminate these costly and sometimes environmentally hazardous surface treatments. Additional protection of the external surface of the MPE can be achieved by using fin material alloys that preferentially corrode in contact with the MPE alloy (i.e. the fins act as sacrificial anodes). For this reason, the fin alloy must be more electronegative than the MPE alloy. The low melting point Al-Si alloys which are used to clad the MPE are – in the brazed condition – already slightly electronegative to most of the Al-Mn based MPE alloys, i.e. the addition of Zn to the clad alloy is often not necessary.
Alloys available at HE Tubing:
On customer specific request, we do have following Alloys available:
- EN AW-3102 modified
- EN AW 3003 modified
- Heat transfer applications for the automotive marketing (battery cooling and air conditioning)
- Heat transfer applications for the HVAC&R (heating, ventilation, air conditioning and refrigeration) market
- Solar thermal market
- Other industrial applications
HE Tubing is a leading authority on Micro Multi-port Extrusions for heat transfer applications. We have over 25 years of expertise in the automotive and HVAC/R (heating, ventilation, air conditioning and refrigeration) industry. Our main focus lies on the auto industry. Furthermore, the HVAC/R industry has been a fast-growing market for the last few years.Read more
Meet HE Tubing at the next trade fairs
11th International Congress and Exhibition Aluminium Brazing 2020
Düsseldorf | 4 May - 6 May 2021
Düsseldorf | 9 MAY - 13 MAY 2022
Nuremberg | 11 Oct - 13 OCT 2022
HE TUBING STANDS FOR:
Thinking in solutions
Privately held company
Quality comes first
Research & Devolpment
Over 25 years of expertise