Through-hole technology remains indispensable for electronic products that demand mechanical strength, high current handling, and long-term field reliability. While surface-mount assembly dominates compact consumer devices, connectors, transformers, relays, and power components still depend on robust through-hole solder joints. wave soldering pcb assembly service is the backbone of this process, and understanding how it works, where it excels, and what a capable manufacturing partner brings to the table can make the difference between a dependable product and a field-return headache.
Wave soldering is a high-throughput batch soldering process used primarily to join through-hole technology (THT) component leads to a printed circuit board. In this process, the assembled board passes over a continuously flowing wave of molten solder. The solder wets the exposed component leads and plated through-holes on the board's underside, forming reliable mechanical and electrical connections in a single, controlled pass.
The method is especially valued for production environments where many through-hole components must be soldered simultaneously. Compared to manual hand soldering, wave soldering delivers far greater consistency, higher throughput, and lower per-joint cost. It is also the preferred process when a board combines surface-mount and through-hole components in a dip plug-in and smt mixed assembly service, where SMT parts are first reflow-soldered and then the board proceeds through the wave for through-hole joints.
A controlled wave soldering workflow reduces defects and ensures that every solder joint meets acceptance criteria. Farway Electronic, based in LongGang, Shenzhen, runs a structured DIP through-hole process across two plug-in production lines and two wave-soldering machines, supported by 24 rear-welding stations and a board-washing machine.
Through-hole assembly is not an outdated technology; it is a deliberate engineering choice for components and applications where mechanical retention, power handling, and serviceability take priority over miniaturization. Choose through-hole when your design includes:
For boards that combine dense SMT layouts with these mechanically demanding components, a through-hole soldering service integrated with SMT assembly offers the best of both worlds: compact circuit density alongside robust, field-reliable through-hole joints.
Farway Electronic operates a dedicated DIP through-hole production environment designed for both prototype and volume production. The published process capability reflects practical manufacturing capacity for demanding electronics:
| Capability | Published Detail |
|---|---|
| Plug-in production lines | 2 dedicated DIP plug-in lines |
| Wave soldering equipment | 2 wave-soldering machines (Nitto equipment) |
| Rear-welding stations | 24 stations for touch-up and repair welding |
| Maximum PCBA board size | 510 mm × 460 mm |
| Board types supported | Rigid, flexible, and rigid-flex boards from 1 to 32 layers |
| Board thickness range | 0.2 mm to 8 mm |
| Inspection during DIP | Plug-in AOI, IPQC and QA sampling |
| Assembly standards | IPC-A-610 for PCBA assembly |
Reliable through-hole soldering depends on disciplined inspection at every stage. Farway integrates quality control into the DIP workflow rather than treating it as a final-stage afterthought. The inspection and testing regime covers incoming materials, in-process control, and post-soldering verification.
During and after wave soldering, through-hole solder joints are checked for wetting quality, hole fill, bridging, excess solder, insufficient fill, and other visible defects. Plug-in AOI supplements visual inspection, while IPQC and QA sampling confirm workmanship consistency across production batches. Boards then proceed to comprehensive electrical verification, including ICT circuit testing, FCT functional testing, and oscilloscope-based checks where required.
One-year free-repair commitment: Farway's PCBA testing service includes a one-year free-repair commitment for eligible non-external defects arising during standard customer use, giving buyers added confidence in assembly reliability beyond the production line.
For buyers evaluating a through-hole assembly partner, certifications provide third-party evidence that a manufacturer's quality systems have been audited and meet recognized standards. Farway Electronic holds the following management-system certifications, which are directly relevant to through-hole assembly customers:
Product certifications listed within Farway's scope include UL, RoHS, SGS, and REACH. The company identifies IPC-A-610 as its PCBA assembly standard and IPC-A-600H as its PCB implementation standard. These certifications and standards should still be verified directly with Farway before contractual, regulatory, or supplier-qualification use, as they represent website-published claims.
Many modern electronic products combine SMT components with through-hole parts on the same board. Managing this mixed-technology assembly across two separate vendors introduces coordination risk, communication overhead, and inconsistent quality standards. Farway addresses this by offering both SMT and DIP services under one roof in its Shenzhen facility.
The typical mixed-assembly flow begins with SMT placement and reflow soldering for surface-mount components, followed by through-hole insertion for leaded parts, wave soldering or selective soldering for through-hole joints, and finally inspection and functional testing. This integrated approach means a single partner handles the complete PCBA process, from bare board to tested assembly, with consistent workmanship standards throughout.
Farway supports this flow with two SMT production lines equipped with Yamaha placement machines and Jintuo ten-zone reflow soldering equipment, alongside its DIP lines. The company also provides conformal coating, PCBA testing, and finished-product assembly, allowing customers to extend from tested boards all the way to boxed, ship-ready products.
Through-hole assembly remains prevalent across industries where product longevity, repairability, and mechanical robustness are non-negotiable. Farway's through-hole and mixed-assembly services serve customers in several of these sectors:
When evaluating a wave soldering and DIP assembly partner, the following factors have the greatest practical impact on product quality and project outcomes:
Farway Electronic combines dedicated wave-soldering equipment, certified quality systems, and an integrated SMT-plus-DIP production environment to deliver through-hole PCB assemblies for demanding industries. From prototype validation to repeat production, our Shenzhen facility provides the process control, inspection depth, and documentation that reliability-focused projects require.
Contact: sales@farway.hk | Phone: 181 2472 7402
Website: https://www.farway.hk/
Location: WanDa Industrial Park, Bao Long Street, LongGang, Shenzhen, China
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