Problem

A Korean camera actuator (VCM) supplier faced low throughput and inconsistent weld quality when manually spot‑welding enamelled coil leads to actuator terminals. Manual alignment and variable weld energy produced weak joints, insulation breakdown, and cosmetic defects—driving rework and failing pull‑force tests. The customer needed a compact production welder that could convert manual operations to semi‑automated inline cells while meeting aggressive UPH targets for high-volume smartphone lines.

Cause

Key failure modes were operator-dependent electrode force, imprecise pulse timing, and poor control of instantaneous weld current. Manual presses could exceed safe contact force or under-compress, causing incomplete fusion or insulation punch-through on thin enamel coatings. Legacy hot‑press welding systems were bulky, costly, and not optimized for delicate coil wires used in Korean VCMs, making local sourcing and rapid deployment challenging.

Solution: DW200P Micro Spot Welder 

Mingseal supplied the DW200P micro spot welder configured for VCM enamelled‑wire welding and integrated it into semi‑automated stations to replace manual welding and imported hot‑press machines. The DW200P addresses the process technically and operationally:

• Controlled micro‑force actuator: The welding head delivers a minimum contact force of 40g ± 5g, preventing insulation puncture while ensuring consistent electrode contact. Fine force control reduces mechanical deformation of the delicate coil and stabilizes electrical contact during the pulse.
• High‑resolution transistor power supply with ultra‑fast feedback: The DW200P’s transistor current source performs real‑time current sampling and feedback every 10 microseconds. This sub‑ms control shapes the welding waveform precisely, minimizing thermal overshoot and ensuring repeatable fusion. As a result, weld pull strength and bead appearance remain highly consistent across long runs.
• Precise motion and vision alignment: X/Y positioning repeatability ±0.015mm and vision-guided fiducial alignment remove operator placement variability, guaranteeing electrode hit accuracy on tiny weld pads.
• Multi‑pulse and programmable recipes: Operators can lock validated recipes (pulse count, dwell, current profile, force) into MES for traceability and rapid changeovers across VCM models.

Integration and Results

The DW200P units were deployed in semi‑automatic cells where an operator loads carriers and the machine performs vision alignment, subtle Z compression, and the programmed weld sequence. This hybrid approach preserves floor flexibility while eliminating manual pulse timing and force variability.

Measured results from the Korean pilot:

• Throughput: Achieved 1,800~2,000 UPH per cell in continuous operation, meeting the plant’s target production rate with a single semi-automated station.
• Yield: First‑pass yield improved by over 60% due to reduced cold joints and fewer insulation‑break failures.
• Mechanical integrity: Weld pull strength variance reduced by >50% as a result of transistor waveform control and consistent contact force.
• Cosmetic consistency: Uniform weld appearance minimized downstream inspection rejects and improved final assembly aesthetics.

Competitive Advantage 

For Korea’s VCM industry, DW200P offers a domestic alternative to imported hot‑press welders with a smaller footprint, lower integration cost, and faster local support. Its micro‑force head and nano‑timing current feedback are specifically tuned for enamelled wire and thin‑film terminals found in modern camera actuators, allowing local suppliers to meet OEM reliability expectations without relying on foreign equipment.

Recommendations and Best Practices

• Validate weld recipes across representative enamel thicknesses and terminal alloys during FAT; store recipes in MES.
• Use the DW200P’s multi‑pulse modes to tailor energy deposition for different wire diameters (φ0.02~0.1 mm).
• Schedule electrode maintenance based on shot counts and implement inline pull‑test sampling to monitor drift.

Conclusion 

The DW200P micro spot welder transforms manual VCM enamelled‑wire welding into a high‑speed, reliable semi‑automated process. With micro‑force control (40g ± 5g), precise motion, and recipe traceability, it delivers the UPH and weld quality Korean camera module makers require while enabling local supply chain independence.