In marine engineering and other harsh-environment applications, high-power PCB power supplies must meet extremely strict requirements for reliability, solder quality, and mechanical strength. Even small manufacturing deviations can lead to serious performance risks once the system is deployed offshore.
Project Overview: High-Power Power Supply PCBA
- Application: Marine engineering equipment
- Product type: High-power power supply PCB assembly
- PCB copper thickness: 3oz / 3oz
- Assembly process: SMT + THT (wave soldering)
- Key requirements: High current capacity, strong mechanical stability, and 100% through-hole solder penetration
This project demanded not only advanced PCB manufacturing capability, but also strong engineering communication and flexible problem-solving throughout the entire PCBA process.
Material Preparation Challenges in Early Stage
During the initial material preparation stage, the customer placed an order for six different PCBA types at the same time. All components arrived mixed together without clear separation, which significantly increased the difficulty of material sorting and kitting.
Although this situation greatly reduced warehouse efficiency and increased labor time, we chose not to charge any additional fees due to our long-term cooperative relationship with the customer. This decision ensured project continuity and reflected our commitment to partnership-based PCBA services.
Component Orientation and Installation Confirmation
One specific power component could technically be installed in two possible directions. To avoid any functional risk, production was temporarily paused while we confirmed the correct orientation directly with the customer.
Only after receiving written confirmation did we proceed with assembly. This step, although time-consuming, ensured design intent accuracy and avoided costly rework or reliability issues later
Thick Copper PCB Soldering Difficulties (3oz Copper)
The PCB featured 3oz thick copper on both inner and outer layers, which posed major challenges during soldering:
- Thick copper absorbs heat rapidly, making solder melting difficult
- Tin flow was slow and uneven at standard temperatures
- Excessive heat risked damaging components and pads
To address this, operators had to lower the soldering temperature and repeatedly apply solder in multiple passes. While this method was inefficient, it was the safest approach to achieve acceptable solder penetration without damaging the PCB.
Wave Soldering Constraints and Process Optimization
Several additional factors complicated wave soldering:
- The PCB had no process edge (panel rail)
- The customer required wave soldering without pre-tinning
- Board size and weight significantly reduced conveyor speed
As a result, wave soldering had to be performed at a much slower speed to ensure proper solder wetting and joint formation.
Flat Pad Requirements for Metal Hole Assembly
The board design required 24 metal holes to be assembled at a later stage. Therefore:
- All solder pads had to remain perfectly flat
- No excess solder or tin buildup was allowed
- Upper and lower PCB surfaces required protection using high-temperature adhesive tape
In addition, the metallized grounding holes on the upper left and right sides of the PCB were strictly prohibited from tin adhesion.
Despite careful masking, solder contamination still occurred during wave soldering. After the process, skilled operators manually corrected and flattened the pads to meet the strict assembly requirements.
Resistor Lead Forming Issue and Design Flexibility
Twelve resistors were originally designed to be processed into K-shaped leads before insertion. However, due to the absence of a dedicated lead-forming machine, manual processing would have been extremely difficult and inconsistent.
After technical discussion, we proposed an alternative:
- Maintain the original component height
- Skip K-foot forming while ensuring mechanical stability
The customer accepted this solution, as the functional and dimensional requirements were still fully met. This adjustment significantly reduced risk and improved production efficiency.
Transportation Risk Assessment for Heavy PCBA
Due to the high weight and large size of the assembled power supply PCBA, the customer initially planned to use express courier delivery.
After evaluating the mechanical risks, we strongly recommended customer self-pickup instead. Rough handling during express transportation could easily cause:
- Solder joint cracking
- Heavy component displacement
- Functional failure of the power board
The customer agreed with our assessment and accepted the self-pickup plan, ensuring safe delivery of the PCBA.
Strict Quality Control and Acceptance Standards
The power supply PCBA had extremely high quality requirements:
- 100% tin penetration for all THT through-hole pads
- Main power components firmly seated against the PCB
- No visible floating height, tilt, or misalignment
Despite the complexity, our production team remained focused and motivated. It took an entire day to complete and confirm the first article, which was then fully approved by the customer.
Engineering Communication and Factory Support
Throughout the project, we communicated continuously with the customer regarding:
- Material shortages
- Component installation methods
- Wave soldering limitations and results
Since the customer was a design engineer without hands-on manufacturing experience, we invited them to visit our PCBA factory. From SMT assembly to DIP and wave soldering, we explained each process step in detail.
This transparent communication helped bridge the gap between PCB design and real-world manufacturing, providing valuable insight for the customer’s future designs.
Final Results and Customer Feedback
After receiving the finished PCBA, the customer reported:
- Stable electrical performance
- No functional or mechanical issues
- Full compliance with original design requirements
The customer expressed high satisfaction with the PCBA quality, engineering support, and manufacturing professionalism.
Looking for a Reliable High-Power PCBA Manufacturer?
If you are developing high-power PCB power supplies, marine electronics, or other mission-critical PCBA products, our engineering and manufacturing team is ready to support you—from DFM review and PCB fabrication to SMT, THT, and final testing.
Contact us today to discuss your project requirements or send us an inquiry to receive professional PCBA solutions tailored to your application.
We look forward to building a long-term, reliable partnership with you.
