Laser welding solutions for the automotive industry

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1. Core Advantages (Compared to Traditional Welding)

 High precision and minimal deformation: spot size 0.1–0.3mm, heat-affected zone 0.1–0.3mm, dimensional tolerance ±0.5mm, with almost no deformation in thin-walled parts.
 High strength and good sealing: The weld strength reaches 90%–95% of the base material, the air tightness of continuous welds is improved by 40%, the wind noise is reduced by 3–5dB, and the waterproof rubber strip can be eliminated.
 High efficiency and fast cycle time: Welding speed of 3–12m/min, which is 3–5 times faster than traditional spot welding; production line cycle time of 43–60 seconds per vehicle, with a yield rate of 99.8%+.
 Wide material compatibility: Capable of welding high-strength steel (1500MPa), aluminum alloy, galvanized sheet, and steel-aluminum dissimilar materials, suitable for lightweight applications.
 Cost-effective and environmentally friendly with low energy consumption: Reducing auxiliary materials and polishing processes leads to a 15%-20% reduction in per-vehicle cost; dust emissions are reduced by over 80%, and energy consumption is even lower.

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 Floor panel / Door / Anti-collision beam: Fiber laser welding, aspect ratio 10:1, stable welding of 1500MPa high-strength steel.
 Tailor Welded Blanks (TWBs): Stamping of plates of different thicknesses/materials after tailor welding, used for B-pillars, floor panels, with a weight reduction of 10%–15%.

2. Welding in new energy and three electrics (with the fastest growth)

 Battery Pack / Tray: **Blue Laser (450nm)** welded aluminum alloy (6061/5052), with weld precision of 0.01mm, helium leak detection rate of ≤1×10⁻⁹ Pa・m³/s, and a heat-affected zone 60% smaller than traditional welding.

• II. Three core application scenarios
  1. Body-in-white welding (the most mature)
  
   Roof/side panels/door frames: Laser brazing (0.8–1.5mm weld seam), adopted by Volkswagen ID.4 and Audi A8, enhancing vehicle body rigidity by 30%–50%.
  

 Battery module: tab (copper/aluminum), busbar laser spot welding/seam welding, non-contact processing to prevent electrode damage, with good consistency.
 Motor / Electronic Control: The stator welding of the card dispensing motor and the copper bar connection exhibit a small heat-affected zone with no damage to the insulation layer.

3. Chassis / Safety / Precision Components

 Chassis: subframe, shock tower, steering knuckle, welded with high-strength steel/aluminum alloy, featuring high strength and long fatigue life.
 Safety components: Airbag panel laser weakening (precisely controlling the remaining thickness to 0.3–0.5mm), bumper/energy absorber box integrated stamping and welding.

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  Laser welding of car battery trays

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• Precision components: sensor brackets, ECU housings, transmission gears, with micron-level precision, requiring no grinding after welding.

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III. Standard solution architecture (taking Dainai Laser as an example)
1. Equipment selection (by scenario)

 Body-in-white: Fiber laser (3–6kW, 1064nm) + six-axis robot + 3D vision + weld seam tracking, with a speed of 4–6m/min.
 Battery pack: Blue laser (2–4kW, 450nm) + galvanometer scanning + dual workstations, with a cycle time of 45 seconds per tray.
 Precision components: Pulsed fiber/semiconductor laser (500–1500W) + precision platform + CCD positioning, with an accuracy of ±0.02mm.

2. Production line configuration

 Workstation: Robot + Laser Head + Fixture + Loading/Unloading AGV + Dust Removal System.
 Automation: 3D visual positioning (compensating for ±0.5mm deviation), weld seam tracking, online inspection (AI vision/infrared), data traceability.
 Safety: fully enclosed protection, laser safety interlock, and smoke and dust purification.

3. Process parameters (for reference)

 Top cover brazing: Power 3.5kW, speed 5m/min, spot size 0.8mm, wire feed 1.2mm (copper-silicon welding wire).
 Battery tray welding: Blue light 3kW, speed 3m/min, focal length 250mm, shielding gas 99.99% argon.
 High-strength steel fusion welding: fiber 6kW, speed 8m/min, aspect ratio 10:1, no porosity or cracks.

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IV. Typical Cases

 Dine Laser - Body-in-White (BIW) Line of a Joint Venture Automobile Company: 12 fiber laser workstations, full laser welding for roof/side panels/doors, body rigidity increased by 40%, cost per vehicle reduced by 17%, with a takt time of 45 seconds per vehicle.
 "Dinai Laser - Battery Pack Production Line for a New Energy Vehicle Company: Blue laser dual-station production line, 6061 aluminum alloy tray, weld seam precision of 0.01mm, helium leak detection pass rate of 100%, cycle time of 40 seconds per unit.".
 Volkswagen ID.4: laser welding of the roof, with a weld width of 0.8mm, a drag coefficient reduced by -0.02, a weight reduction of 5kg, and the elimination of the roof rubber strip.

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V. Development Trends

 AI + Laser: AI vision real-time correction, adaptive power adjustment, intelligent defect recognition, achieving a yield rate of up to 99.95%+.
 Ultra-high speed welding: optical shutter time-division multiplexing (single laser with dual stations), galvanometer scanning, achieving speeds of 10–15m/min.
 Deepening of lightweight materials: Dissimilar welding of steel and aluminum, aluminum-lithium alloy, and carbon fiber composite connections, contributing to a 10%-20% reduction in vehicle weight.
 Green and low-carbon: low-energy lasers, closed-loop treatment of smoke and dust, and waste recycling, all of which meet the requirements of carbon neutrality.

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VI. Differential Advantages of Dine Laser

 Full-scenario coverage: Comprehensive solutions for body-in-white, powertrain, chassis, and safety components, suitable for both fuel-powered and new energy vehicle models.
 Self-developed core components: fiber/blue laser, laser head, weld tracking system, high cost-effectiveness, fast after-sales response.
 Customized production line: Tailored according to production capacity (100,000–600,000 vehicles/year), vehicle model (A0–D class), and material (steel/aluminum/dissimilar), with a short delivery cycle.
 One-stop service: full-process support for process development, equipment manufacturing, installation and commissioning, personnel training, and after-sales maintenance.