Despite the dominance of surface mount technology in modern electronics, through-hole assembly remains indispensable for products that demand mechanical strength, thermal endurance, and long-term serviceability. Connectors, transformers, large capacitors, relays, and power semiconductors all depend on the robust pin-through-board connections that DIP soldering provides. For electronics brands sourcing from China, finding a
contract dip welding manufacturer that combines real wave-soldering capability with disciplined quality control is the difference between a reliable product and a field-return headache.
Why Through-Hole Assembly Still Matters
Through-hole technology (THT) secures component leads by passing them through plated holes in the PCB and forming solder joints on both sides of the board. This dual-side mechanical anchoring delivers several advantages that surface mount alone cannot match:
- Mechanical robustness — Pins anchored through the board resist vibration, shock, and mechanical stress far better than surface-mounted pads, making THT the preferred choice for automotive, industrial, and transportation electronics.
- Thermal dissipation — Power components with through-hole leads transfer heat through the board more effectively, supporting high-current applications such as power supplies and motor controllers.
- Repairability — Through-hole joints are easier to inspect, rework, and ｒｅｐｌａｃｅ, which simplifies maintenance for products with long service lifecycles.
- Connector reliability — Headers, sockets, and terminal blocks subjected to repeated mating cycles hold up better when their leads are physically embedded in the board.
Farway Electronic, based in LongGang, Shenzhen, operates two dedicated DIP plug-in production lines alongside two wave-soldering machines and 24 rear-welding stations, giving the company the capacity to handle both prototype builds and volume production for through-hole assemblies.
The DIP Wave Soldering Process
Farway's
wave soldering service follows a controlled multi-stage workflow designed to produce consistent, IPC-A-610-compliant solder joints on every board:
- Component forming and preparation — Leads are cut and formed to the correct length and pitch before insertion, ensuring proper standoff and alignment.
- Manual or semi-automatic insertion — Operators ｉｎｓｅｒｔ through-hole components into their designated positions following SOP documentation, with trained and certified personnel handling sensitive parts.
- Flux application — A controlled layer of flux is applied to clean oxide from pads and leads, promoting wetting during the solder wave.
- Preheating — Boards pass through a preheat zone that gradually raises temperature, reducing thermal shock and activating the flux.
- Wave soldering — The board travels over a molten solder wave generated by Farway's Nitto wave-soldering equipment, forming reliable joints across all through-hole connections in a single pass.
- Lead cutting — Excess leads are trimmed to specification after soldering.
- Rear welding and repair — Any joints requiring touch-up are addressed at the 24 rear-welding stations by experienced operators.
- Board washing — Residual flux and contaminants are removed using a board-washing machine, leaving clean, inspection-ready assemblies.
- Functional testing — Completed boards proceed to ICT, FCT, and visual inspection to verify electrical integrity before release.
Quality Control Throughout Production
A capable
through-hole soldering service is only as good as the inspection regime behind it. Farway integrates multiple inspection checkpoints across the DIP line:
- Plug-in AOI — Automated optical inspection verifies component presence, polarity, and placement accuracy after insertion.
- IPQC sampling — In-process quality control checks occur at defined intervals during production runs.
- QA sampling — Final quality assurance sampling confirms that solder joint quality, lead length, and board cleanliness meet specification.
- Plug-in visual inspection — Trained inspectors examine joints for wetting, fillet formation, bridging, and cold solder defects.
Production takes place in controlled work-in-process areas with anti-static protections, and the company's quality management system is certified to ISO 9001, ISO 13485, IATF 16949, and ISO 14001 standards — covering medical, automotive, and general industrial requirements.
SMT and DIP Mixed Assembly
Most real-world products combine surface-mount and through-hole components on the same board. Farway addresses this with an integrated
one-stop smt + dip assembly service that coordinates both technologies under one roof. SMT lines place fine-pitch components first, after which the board transitions to the DIP line for through-hole insertion and wave soldering. This eliminates the logistics, lead time, and accountability gaps that arise when SMT and DIP are split across separate vendors.
For products requiring environmental protection after assembly, Farway also offers
conformal coating and low-pressure injection moulding, extending the manufacturing chain from bare board through to a protected, tested assembly.
Equipment and Production Capacity
| Resource |
Details |
| DIP plug-in lines |
2 production lines |
| Wave-soldering machines |
Nitto equipment, 2 units |
| Rear-welding stations |
24 stations |
| Board washing |
Dedicated board-washing machine |
| Max PCBA size |
510 mm × 460 mm |
| Order volume |
Prototype from 1 piece to large batches |
| Standards |
IPC-A-610 assembly standard; ISO 9001 / ISO 13485 / IATF 16949 / ISO 14001 |
Why Partner with Farway for DIP Soldering
- Integrated manufacturing chain — From PCB fabrication and component management through SMT, DIP, coating, testing, and finished product assembly, Farway covers the entire process in one facility.
- Experienced engineering team — A technical staff covering electronic engineering, BOM engineering, structural engineering, and testing supports DFM feedback and process optimization.
- Controlled sourcing — Components are procured through authorized brand agents and distributors, with incoming quality inspection, ERP tracking, FIFO inventory, anti-static storage, and controlled temperature and humidity warehousing.
- Certification coverage — ISO 9001, ISO 13485, IATF 16949, and ISO 14001 certifications support automotive, medical, and industrial market requirements.
- Global delivery experience — Farway has served more than 100 industry customers across more than 20 countries and regions since its establishment in 2018.
If your product requires reliable through-hole assembly backed by wave-soldering capability, certified quality systems, and an integrated manufacturing chain, Farway Electronic is ready to support your next build. Contact the team at sales@farway.hk or call 181 2472 7402 to discuss your DIP soldering requirements and request a quotation.
