Sinupower – a specialized Manufacturer of precision thermal tubing – produces High Thermal Conductivity Aluminum Brass Heater Core Tubes in copper, aluminum, and brass, with seam joining via resistance welding, laser welding, or brazing. In automotive heating systems and HVAC equipment, the heater core is responsible for transferring heat from engine coolant to the cabin. The tube is the heart of that heat exchange. This multi-material, multi-process capability gives heater core manufacturers the flexibility to match tube selection to their specific design requirements: copper for maximum thermal performance, aluminum for light weight and corrosion resistance, or brass for a balanced cost-performance position. All three materials are formed into a B-type flattened profile that maximizes surface area within the compact space of a vehicle's heating system, enabling efficient heat transfer while minimizing the core's physical footprint.
Material Selection – Three Options, One Tubing Solution
High Thermal Conductivity Aluminum Brass Heater Core Tubes are available in three material grades. The selection depends on your heater core's thermal performance targets, weight constraints, and cost parameters:
Copper
- Highest thermal conductivity
- Heaviest of the three
- Highest material cost
- Good corrosion resistance
- Resistance, laser, or brazing compatible
Aluminum
- High thermal conductivity
- Lightest – ~30% of copper weight
- Lowest material cost
- Excellent corrosion resistance
- Resistance, laser, or brazing compatible
Brass
- Good thermal conductivity
- Moderate weight
- Moderate material cost
- Good corrosion resistance
- Resistance, laser, or brazing compatible
Note: All three material options are produced as B-type flattened tubes and can be joined using resistance welding, laser welding, or brazing – giving you complete freedom to select the material-process combination that fits your existing manufacturing line.
Welding Methods – Three Processes, One Tube
Depending on the material and design requirements, Sinupower manufactures High Thermal Conductivity Aluminum Brass Heater Core Tubes using three welding techniques – ensuring strong and leak-proof connections across all material options:
Resistance Welding
- High-speed production
- No filler material
- Cost-effective for volume
- Works on copper, aluminum, brass
- Ideal for high-volume heater core production
Laser Welding
- Narrow heat-affected zone
- Deep weld penetration
- Zero flux or filler
- Clean, oxide-free seam
- Ideal for leak-critical applications
Brazing
- Metal-joining with filler alloy
- Excellent joint strength
- Works on aluminum and brass
- Copper requires special flux
- Ideal for complex core assemblies
Welding Process Comparison – Which Method Fits Your Production?
The table below compares the three welding processes available for High Thermal Conductivity Aluminum Brass Heater Core Tubes across key selection criteria:
| Selection Factor | Resistance Welding | Laser Welding | Brazing |
|---|
| Production Speed | High | Moderate-High | Moderate |
| Leak Integrity | Good | Excellent | Excellent |
| Heat-Affected Zone | Moderate | Minimal | Wider |
| Filler Material Required | No | No | Yes (braze alloy) |
| Copper Compatibility | ✓ | ✓ | Special flux required |
| Aluminum Compatibility | ✓ | ✓ | ✓ |
| Brass Compatibility | ✓ | ✓ | ✓ |
Sinupower capability: We produce B-type tubes using all three welding methods. We can recommend the optimal process based on your material selection, leak-tightness requirements, and production volume.
B-Type Design – Why the Flattened Profile?
High Thermal Conductivity Aluminum Brass Heater Core Tubes are shaped into a flattened or oval profile – commonly referred to as the B-type tube in the heater core industry. This design is not arbitrary; it serves three specific engineering purposes:
Increased Surface Area
Flattening the tube increases the surface area available for heat transfer compared to a round tube of the same cross-sectional area – more heat is transferred from coolant to cabin air per tube.
Compact Packaging
The flattened profile reduces the height of each tube, allowing more tubes to be stacked in a given core depth – maximizing heat transfer within the dashboard space constraints.
Core Assembly Compatibility
The B-type profile creates consistent spacing between tubes for fin insertion, enabling automated core stacking and brazing in high-volume production lines.
Manufacturing Steps – From Strip to Finished Tube
The production of High Thermal Conductivity Aluminum Brass Heater Core Tubes follows a standardized manufacturing sequence. Each step is controlled to ensure consistent quality across all material and process combinations:
Step 1 – Tube Selection
High-quality copper, aluminum, or brass strip is selected based on the specific requirements and performance characteristics of the heater core.
Step 2 – Tube Flattening
The strip is roll-formed into a flattened or oval B-type profile, which increases the surface area available for heat transfer within the heater core.
Step 3 – Tube Welding
The flattened tube seam is joined via resistance welding, laser welding, or brazing – depending on the material and design – to ensure strong and leak-proof connections.
Step 4 – Sizing
Tubes are calibrated to final dimensions through a series of sizing dies, ensuring consistent width, height, and wall thickness across the entire production run.
Step 5 – Cut-to-Length
Tubes are precision-cut to customer-specified lengths and deburred, ensuring square, clean ends ready for fin insertion and header attachment.
Step 6 – Quality Inspection
Each tube undergoes dimensional inspection, leak testing, and visual verification before packaging – ensuring only conforming tubes leave the production line.
Heater Core Integration – How the Tube Fits the System
Heater cores are essential components in automotive heating systems and HVAC units, responsible for transferring heat from the engine coolant to the cabin to keep it warm during cold weather. Sinupower's welded B-type tubes are the core heat transfer element in this system:
Automotive Heating - Transfers engine coolant heat to cabin air
- Essential for passenger comfort in cold weather
- Compact B-type design fits within dashboard
HVAC Air Handling - Heating, ventilation, and air conditioning units
- Similar heat transfer principle using hot water or refrigerant
- Available in copper, aluminum, or brass per specification
Core Assembly Process
- B-type tubes are stacked in parallel between layers of corrugated fins (aluminum or copper).
- Tube ends are inserted into header plates or tank assemblies.
- The entire core is joined via mechanical expansion, brazing, or soldering.
- Completed heater core is leak-tested and installed in the HVAC module.
- The tube's flattened profile enables this stacking efficiency while maximizing surface area for heat transfer.
Quality & Certifications
System Certifications - IATF 16949:2016 – Automotive quality
- ISO 9001:2015 – Quality management
- ISO 14001:2015 – Environmental
- ISO 45001:2018 – Health & safety
Intellectual Property - 2 invention patents (since 2019)
- 15 design patents
- 16 utility model patents
Full certificate copies available upon request.
Partnerships & Supply Chain
Key industry partners:
- Sanhua – HVAC and thermal management components
- Danfoss – Cooling and heating solutions
- Pankl – Drivetrain and thermal systems
5,000+
Annual tons capacity
20-25
Working days lead time
90+
Equipment & tooling types
87.76%
East China sales concentration
Packaging: Wooden crates with VCI anti-rust paper, plastic end caps, steel strapping. FOB Shanghai or Ningbo; EXW available.
Customization – Built to Your Specification
Sinupower offers complete design-to-delivery service for custom High Thermal Conductivity Aluminum Brass Heater Core Tubes. We adapt to your specific heater core design requirements:
- Material: Copper, aluminum, or brass – we supply the grade you specify.
- Welding process: Resistance welding, laser welding, or brazing – we use the method that suits your quality and volume requirements.
- Profile dimensions: Width, height, wall thickness, and length customized per your drawings.
- Cross-section: B-type (standard), round, D-shaped, oval, or rectangular.
- End finishes: Square cut, chamfered, flared, expanded, or grooved.
- Surface treatment: Conversion coating, zinc-flake, epoxy, anodized (per material).
Custom Development Timeline
- Design input: Customer provides drawings, material preference, and process requirements.
- Feasibility review: Engineering team validates the material-process combination.
- Tooling: Forming and welding dies manufactured in-house – 15–20 working days.
- Prototype: Up to 100 pieces for customer testing – die cost only.
- Production: Full-scale manufacturing with PPAP Level 3 available.
- Delivery: Scheduled shipments with material certificates and inspection reports.
Quality Assurance – Verified Process Control
Every batch of High Thermal Conductivity Aluminum Brass Heater Core Tubes follows our quality control framework:
- Raw material verification: Alloy composition, thickness, and surface quality checked on incoming coils.
- In-process monitoring: Forming dimensions, weld seam quality, and annealing temperature tracked continuously.
- Dimensional inspection: Width, height, wall thickness, and length measured on 100% of tubes.
- Leak testing: Air-under-water or helium mass spectrometry per customer specification.
- Weld integrity: Visual and microscopic inspection of seam quality.
- Mechanical testing: Tensile, burst, and flattening tests per heat-treatment batch.
Sustainability
- Energy: Regenerative burner technology reduces gas consumption by 18%.
- Recycling: 98% material utilization – all scrap returned to certified recyclers.
- Water: Closed-loop rinsing reduces water usage by 40%, zero heavy metal discharge.
- Compliance: RoHS and REACH compliant.
- Material recyclability: Copper, aluminum, and brass are all fully recyclable with well-established recovery streams.
Frequently Asked Questions
Q: What materials are available for these heater core tubes? A: We offer copper, aluminum, and brass. Material selection depends on your heater core's thermal performance, weight, and cost targets.
Q: Which welding process is best for my application? A: Resistance welding is ideal for high-volume production. Laser welding offers superior leak integrity with minimal heat distortion. Brazing is preferred for complex assemblies or aluminum cores.
Q: Why is the B-type flattened profile used for heater cores? A: The flattened shape increases surface area for heat transfer while reducing the height of each tube – allowing more tubes to be stacked in a compact heater core assembly.
Q: What is the typical lead time for production orders? A: Standard lead time is 20–25 working days for orders up to 50,000 pieces. Custom tooling adds 15–20 working days.
Q: Can you produce custom cross-section profiles? A: Yes. Beyond the standard B-type profile, we manufacture round, D-shaped, oval, and rectangular tubes for specialized heater core designs.
Q: Do you provide material certifications with shipments? A: Yes. Every shipment includes mill test certificates (MTC), dimensional inspection reports, and leak test documentation per customer requirements.
Sinupower delivers High Thermal Conductivity Aluminum Brass Heater Core Tubes in copper, aluminum, or brass – with the flexibility to support resistance welding, laser welding, or brazing processes. We invite heater core manufacturers, automotive HVAC suppliers, and thermal systems engineers to contact us for samples, process guidance, or a collaborative design review.
Engineering review: Mr. Gao Qiang, Sinupower Founder – 20+ years in aluminum extrusion and thermal management, including prior leadership at Fortune 500 manufacturing companies.
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