S-WS450 Wave Soldering Machine by Southern Machinery: High-Volume Through-Hole Soldering

What Is This Machine Used For?

The S-WS450 is Southern Machinery's standard wave soldering machine for through-hole (THT) PCB assembly. It applies molten solder to the underside of a board as it travels over a solder wave, forming the electrical and mechanical joints on leaded components — connectors, relays, electrolytic capacitors, transformers, power resistors, and terminal blocks — that SMT reflow alone cannot finish.

Q: What does "wave soldering" actually do?

A: After through-hole components are inserted (manually or by an auto insertion machine), the board passes over a flowing "wave" of molten solder. The wave wets the component leads and plated through-holes, creating a solid fillet on every joint in a single pass — far faster than hand soldering dozens of joints one at a time.

Q: How is the S-WS450 different from smaller wave soldering machines?

A: It is built for wider boards (up to 450 mm) and higher throughput. Its 4-zone preheat, 4–7° conveyor exit angle, and a 450 kg full-titanium lead-free solder pot with ±1–2 °C control give process engineers the thermal headroom to run lead-free (SAC) alloys reliably at volume.

Q: Lead-free or tin-lead?

A: Both. The full-titanium pot and 350 °C capability support lead-free solder as well as conventional alloys, so the same machine can serve RoHS-compliant and legacy production lines.

Typical Application Scenarios

The S-WS450 serves the through-hole soldering step across Southern Machinery's core sectors:

Home appliances — control boards for air conditioners, TVs, washing machines, induction cookers, and microwave ovens, where high volumes and mixed through-hole connectors demand a robust, repeatable wave.
Power supply & energy-saving lighting — power supplies, ballasts, LED drivers, street lamps, and floodlights, where heavier copper boards and large electrolytic capacitors benefit from a stable high-mass solder pot.
Vehicle electronics — car audio, vehicle power supplies, and EV-related control modules that call for consistent, durable joints across wider panelized boards.
Industrial control & general electronics — instruments, meters, and control systems with terminal blocks and relays that require dependable, high-cycle soldering.

How It Integrates Into a Complete PCB Assembly Line

A wave soldering machine is the through-hole finishing step in a full SMT + THT line. In a typical Southern Machinery line:

SMT side: Solder paste printing → Pick and Place → Reflow Oven → AOI.
THT side: Through-hole components are inserted — radially by an S-3010B Radial Insertion Machine, axially by an S4000, or odd-form parts by an S-70LD / S7000 series inserter.
Wave soldering: The populated board enters the S-WS450, where flux is applied, the board preheats through 4 zones, and the solder wave forms every through-hole joint in one pass.
Post-wave: The 4–7° exit angle returns excess solder to the wave (fewer icicles and bridges), the board cools, and an SM-600XZ after-wave lead cutter trims component leads downstream.

Because Southern Machinery supplies insertion, soldering, and post-solder handling from one engineering team, the whole THT segment is specified, commissioned, and supported as one system — no integration finger-pointing between vendors.

Key Selection Parameters

When evaluating any wave soldering machine — including the S-WS450 — confirm these parameters against your board mix:

Maximum board width — the S-WS450 handles boards up to 450 mm wide; verify your largest panelized board fits.
Preheat architecture — the number of zones, heating method (IR vs. hot-air), and PID control determine how reliably you can ramp heavy boards without thermal shock.
Solder pot material & capacity — a full-titanium pot resists lead-free solder corrosion and provides the thermal mass for stable joint temperature on high-volume runs.
Conveyor control — adjustable speed and exit angle let you tune dwell time and solder drainage to reduce bridging and icicles.
Lead-free readiness — confirm the machine's temperature ceiling and pot material support SAC alloys for RoHS compliance.
Flux application — spray vs. foam fluxing affects flux consumption and joint cleanliness.
Line compatibility — SMEMA compliance and conveyor height so the machine drops into your existing board-handling line.

Work with Southern Machinery's engineers to confirm each parameter against your specific board mix and throughput target before finalizing a purchase.

ROI, Quality & Throughput Considerations

Wave soldering replaces manual through-hole soldering — the single largest source of rework and inconsistency in THT assembly. The ROI case rests on three pillars:

Labor reduction: One operator and one wave soldering pass replaces a bench of hand-soldering operators, cutting direct labor per board while improving repeatability.
First-pass yield: Consistent preheat and a stable, full-titanium pot produce uniform fillets and fewer bridges, icicles, and cold joints — fewer rework stations and less scrap.
Total cost of ownership: Southern Machinery positions the S-WS450 at 40–60% of Japanese and Tier-1 equivalents (Panasonic RL133, JUKI JM-E01, UIC) with TCO roughly 40–50% lower, backed by 237+ global customers and direct-from-Shenzhen spare parts and training.

The global wave soldering market is projected to grow from about $1.28B (2025) to $2.14B (2034) — a healthy, expanding track where full-wave soldering remains the cost-effective choice for high-volume through-hole production.

FAQ

What board widths can the S-WS450 handle?

Up to 450 mm maximum board width (minimum 50 mm), covering most panelized home-appliance, power-supply, and LED boards.

Is the S-WS450 lead-free capable?

Yes. The 450 kg solder pot is full titanium, rated to 350 °C, and supports lead-free (SAC) as well as conventional alloys.

How is preheat controlled?

Four preheat zones with IR tube heating (hot-air optional) and PID + SSR control ramp boards to 250 °C for reliable lead-free soldering.

What is the conveyor exit angle for?

The 4–7° exit angle directs excess solder back to the wave, reducing solder icicles and bridges on through-hole joints.

Can Southern Machinery supply the surrounding line equipment?

Yes. Southern Machinery offers the full THT segment — radial, axial, and odd-form insertion, wave soldering, and after-wave lead cutting — as a single integrated line.

How do I get a quote?

Contact Jason Wu with your board size, component mix, and monthly volume for a configured proposal and lead time.

Contact Southern Machinery

Planning a new through-hole soldering line — or upgrading an existing one? Southern Machinery delivers Shenzhen-direct value with full-line engineering support.

Email: jasonwu@smthelp.com
Phone / WhatsApp: +86 13602562576
Website: https://www.smthelp.com
File portal (catalogs & specs): https://file.autoinsertion.com
Image library: https://ph.smthelp.com

Watch in Action: https://www.youtube.com/watch?v=dEeBOEpMoec

Two questions to start the conversation: What is your current through-hole first-pass yield, and how many manual soldering stations does your THT line still run? If yield is slipping or labor is climbing, the S-WS450 may pay for itself faster than you expect.

About Southern Machinery: Founded in 2011 in Shenzhen, China, Southern Machinery specializes in SMT and THT PCB assembly automation equipment, with 237+ global customers and full-line solutions spanning SMT, THT, wave soldering, board handling, and inspection. High efficiency, cost-effective, with global support, spare parts, and training.