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Friction Stir Welding Service for Fiber Laser Water-Cooled Radiators

Our fiber optic heat sink welding services provide reliable thermal management solutions through precision Friction Stir Welding (FSW). Building on our proven experience in laser cooling components, we deliver contract FSW welding, custom machining, and stable aluminum–copper bonding for high-performance fiber laser systems.
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Overview

We provide specialized FSW contract welding for fiber laser water-cooled radiators, including aluminum, copper–aluminum composite plates, micro-channel structures, and precision optical cooling bases.
Customers may bring their own CNC-machined parts, outsource full machining + FSW to us, or request equipment customization for in-house welding.

Our service focuses on reliability—precision sealing of water channels, stable metallurgical bonding, and consistent thermal performance.

Industry Pain Points

High-power fiber laser systems rely heavily on efficient thermal management to maintain stable operation and avoid overheating. The core of this system is often a precision-machined, water-cooled aluminum-copper radiator, where any defect can compromise performance.

However, traditional joining methods like TIG or brazing present significant limitations:

  • Micro-channel leakage – Fusion welding often causes porosity or weak fusion areas, leading to coolant leakage.

  • Thin-wall deformation – High heat input distorts delicate aluminum fins, affecting surface flatness and assembly precision.

  • Dissimilar metal joint failure – Bonding aluminum to copper is inherently difficult using conventional methods.

These technical bottlenecks increase rejection rates, raise manufacturing costs, and reduce product reliability in the field.

Why FSW Is the Ideal Solution

Friction Stir Welding (FSW) is a solid-state process that avoids melting, providing a cleaner, more precise alternative to traditional fusion welding.

Key advantages include:

  • Defect-free weld seams – Eliminates porosity and leakage pathways in high-density coolant channels.

  • Minimal heat input – Prevents distortion in thin-walled or precision-milled parts.

  • Aluminum-copper compatibility – Achieves strong, consistent bonding across dissimilar materials.

  • High repeatability – CNC-controlled equipment delivers consistent quality from prototype to mass production.

FSW enables high-reliability performance for components used in critical thermal applications like fiber lasers.

Technical Highlights

  • High joint strength – Achieves 90–95% of parent material strength in aluminum and aluminum-copper joints.

  • Low distortion – Welded components typically maintain flatness within ≤0.25 mm, even on thin-walled sections.

  • No filler material – Solid-state joining eliminates the need for flux or filler wire.

  • Automated process control – Consistent, repeatable weld quality at scale.

Applications

Our FSW welding process is ideal for:

  • Fiber laser cutting & welding systems – Reliable cooling under continuous high load.

  • High-power laser modules (3–10kW) – Efficient thermal control in compact form factors.

  • Industrial water-cooled radiators – Leak-free joining of aluminum-copper composite plates.

  • Precision photonics & optics equipment – Low-distortion welds for high alignment accuracy.

Three Cooperation Modes 

We offer flexible cooperation models tailored for overseas laser manufacturers:

Mode 1 — FSW Equipment Customization + Customer Self-Production

For clients wanting full in-house manufacturing.
We design and build custom FSW machines optimized for laser radiator welding.

Mode 2 — Customer Supplies Material + We Provide FSW Welding

You machine the parts (or supply semi-finished plates),
and we provide FSW contract welding + leak testing + finishing.

Mode 3 — One-Stop Solution (Material Sourcing + CNC + FSW)

If you prefer outsourcing, we:

  • Source aluminum or Al–Cu composites from approved suppliers

  • Provide CNC milling (2 CNC machines for pre- and post-processing)

  • Complete FSW welding & QC

  • Deliver finished radiator assemblies

Ideal for OEMs seeking stable quality and controlled cost.

Production Workflow

  • CAD/CAM design confirmation

  •  Material preparation and surface cleaning

  •  CNC pre-machining and clamping

  • Friction stir welding under optimized parameters

  • Post-machining and drilling

  • Pressure and leak testing

  • Cleaning, packaging, and delivery

Quality Control & Testing

Every radiator undergoes standardized FSW inspection:

  • 100% visual weld inspection

  • Flatness measurement (≤0.25 mm typical)

  • Leak testing: air pressure / water pressure / immersion testing

  • Sample tensile testing for new projects

  • Material traceability & batch welding records

  • SPC process monitoring for mass production stability

Case Example: From Leakage to Laser Stability

A leading laser equipment OEM experienced chronic leakage in copper-aluminum radiators welded by TIG. These defects disrupted coolant flow and compromised system uptime.

After switching to our FSW process, they reported:

  • Zero leakage across 500+ units

  • Radiator flatness controlled to ≤0.25 mm

  • Continuous operation at 10kW power output

  • Reduced rework and warranty-related returns

This translated into more stable laser performance and improved cost efficiency.FSW became their long-term manufacturing solution.

FAQ

Q1: What materials do you support for radiator welding?
A1: We work with aluminum alloys (6000 & 7000 series) and aluminum-copper composite designs commonly used in laser cooling systems.

Q2: How do you ensure quality control?
A2: Each project includes 100% visual inspection, dimensional checks, and sample tensile testing. Leak testing (air/hydro) is available upon request.

Q3: Do you handle both prototypes and volume production?
A3: Yes. We support R&D prototyping, small-batch runs, and full-scale contract manufacturing.

Q4: What part size and weld thickness can you handle?
A4: Workpieces up to 800 mm in length; weld thicknesses from 1.5 mm to 8 mm, depending on joint design.

Q5: What’s the typical lead time?
A5: Prototypes are ready in 7–10 business days. Mass production starts from 2–4 weeks based on volume and testing needs.

Q6: Can you process customer-supplied materials or semi-finished plates?

A6:Yes. We accept customer-supplied raw materials or CNC-prepared plates and provide welding-only services to ensure full flexibility.

Our Friction Stir Welding Services

We offer reliable contract FSW processing for:

  • Fiber laser cooling modules

  • Aluminum-copper heat sink plates

  • Micro-channel radiator joining

  • Custom laser thermal components

Our team combines technical expertise with advanced FSW equipment to ensure every weld meets industrial thermal performance standards. Whether you're an OEM, system integrator, or R&D lab, we help you deliver precision with confidence.

CTA:

Whether you're solving leakage problems or scaling production, our FSW service ensures stronger, cleaner, and more reliable fiber laser cooling components.

Contact us for a technical evaluation or sample review.
We help you deliver stable laser performance with confidence.

Heat Sink

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The company is dedicated to providing customers with one-stop services in the field of special welding, ranging from intelligent equipment, advanced manufacturing, welding consumables to technical service support.

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Landline: +86-769-8278-1216
E-mail:  brad.wang@alcu-fsw.com
               zoey.zhang@alcu-fsw.com
Phone: +86-156-3608-6589 
             +86-135-4472-5331
Add: Buliding C, Jinshi Technology Park, Dalingshan Twon, Dongguan, Guangdong, China
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