What are the advantages of galvanometer laser soldering?

Galvanometer laser soldering is a precision welding process that combines galvanometer scanning technology with laser welding principles. It is widely used in fields such as electronics manufacturing and precision instruments. Its core advantages lie in its efficiency, precision, and adaptability, with specific details as follows:                                              

1. Efficiency: Significantly Improves Welding Speed

High-Speed Scanning Reduces Motion Time

The galvanometer system controls the laser beam path through high-speed deflection mirrors, eliminating the need for physical movement of robotic arms or work platforms. Its response time can reach the microsecond level. Compared to traditional laser welding (which relies on platform movement), the welding speed can be increased by 3 to 10 times, making it particularly suitable for continuous processing of batch solder joints (such as dense solder points on PCB boards).

One-Time Processing of Multiple Solder Joints

The galvanometer can pre-program paths for multiple solder joints, allowing the laser beam to continuously scan along a set trajectory. This enables "single positioning, multi-point welding," reducing repeated positioning time and significantly improving production cycle time.

2. Precision: Meets the Requirements of Micro-Scale Solder Joints

High Positioning Accuracy and Spot Control

The galvanometer achieves a positioning accuracy of up to ±0.001 mm. Combined with a focusing optical system, the laser spot diameter can be reduced to below 50 μm (or even smaller), enabling precise matching with micro-scale solder joints (such as pins of mobile phone camera modules or sensor leads). This minimizes the risk of thermal damage to surrounding components.

Small Heat-Affected Zone (HAZ)

Laser energy is highly concentrated, and its interaction time is short (ranging from milliseconds to microseconds). The high-speed scanning of the galvanometer further reduces the laser's dwell time on any specific area, significantly lowering the risk of thermal deformation and oxidation in the materials surrounding the solder joints. This makes it particularly suitable for welding heat-sensitive components (such as chips and ceramic parts).

3. Flexibility: Adapts to Complex Scenarios and Diverse Requirements

Capability for Complex Path Welding

The galvanometer system supports programming of arbitrary 2D graphical paths (such as straight lines, curves, circles, grids, etc.), enabling easy implementation of irregular solder joints, continuous welds, or large-area solder paste sintering. This adaptability meets diverse welding needs (e.g., connections between FPC flexible boards and rigid boards, battery tab welding, etc.).

Non-Contact Welding Without Mechanical Stress

The laser acts remotely on solder joints through an optical system without direct contact with the workpiece. This avoids the damage to precision components caused by mechanical pressure in traditional welding methods (e.g., soldering iron welding), making it particularly suitable for micro-components that are prone to deformation or fragility.

Compatibility with Various Solder Materials and Processes

It can be used with a variety of solder materials, such as solder paste, solder wire, and preformed solder sheets. Additionally, it supports synchronous or step-by-step processes combining "laser heating + solder melting," meeting the welding requirements of different materials (e.g., copper, aluminum, stainless steel).

4. Stability and Automation: Ensuring Mass Production Quality

Stable Energy Output and High Solder Joint Consistency

Laser energy is precisely controlled by a digital system, combined with the high-speed and stable scanning of the galvanometer. This ensures consistent size and strength for each solder joint in mass production, reducing defect rates (typically controlled below 0.1%).

Easy Integration into Automated Production Lines

The galvanometer module is compact and features standardized control signals, allowing seamless integration with vision positioning systems, conveyor belts, robots, and other equipment. This enables fully automated closed-loop production processes, including loading/unloading, positioning, welding, and inspection, minimizing manual intervention and enhancing production stability.

5. Cost-Effectiveness: Significant Long-Term Cost Advantages

Although the initial equipment investment is relatively high, galvanometer laser soldering offers low consumable costs (e.g., laser tube lifespan can exceed 100,000 hours) and minimal maintenance expenses. Additionally, the efficiency gains lead to increased production capacity, enabling rapid cost amortization. This makes it particularly suitable for medium- to large-scale mass production scenarios.

Application Advantages of Songsheng Opto-Electronic's Galvanometer Coaxial Vision Scanning Welding System:

1. Coaxial Design: Integration of temperature measurement, imaging, laser emission, indicator light, and illumination within a coaxial optical path ensures advanced laser processing capabilities.

2. Closed-Loop Temperature Control: Internal real-time temperature feedback combined with PID robust control guarantees the highest processing yield.

3. Ultra-Fast Infrared Temperature Sensing: The system's infrared temperature sensor responds 1,000 times faster than conventional market solutions, enabling superior welding quality through rapid thermal regulation.

4. Adjustable Spot Shape: The laser spot profile can be freely customized to adapt to diverse pad geometries, ensuring uniform heating and optimal soldering results.

5. Telecentric Scanning Lens Design: Eliminates common distortions associated with standard scanning lenses, achieving consistent precision across the entire marking field.

6. Superior Optical Components: Rigorous testing confirms that multi-element collimating and focusing lenses significantly outperform single or dual-lens designs. While most market systems use single-lens setups, our system employs multi-element diffractive-limited lenses for both collimation and focusing, ensuring exceptional optical quality.

7. Dedicated Multi-Beam Coaxial Technology: Seamless integration of laser, imaging, temperature sensing, and indicator light paths within a unified coaxial architecture.

Summary

Galvanometer laser soldering, with its high speed, efficiency, precision, and flexibility, perfectly meets the demands of modern electronics manufacturing toward miniaturization, integration, and automation. It is increasingly widely used in fields such as consumer electronics, automotive electronics, and medical devices, making it a critical technological direction for replacing traditional welding processes.