Selective Soldering Machine

This machine used for through-hole soldering in DIP line. especially for the some of place where need the soldering instead of entire. ElectronicsTalk provide off-line, in-line , and in-line advanced selective wave soldering machine.

Basic Description of Selective Soldering Machine

Electronics Talk can offer off-line, on-line, and two-module integrated selective wave soldering machine for the customer of various of demands. The off-line type can has a maximum PCB dimension of 300mm and integrated with both flux spraying and soldering, particularly suitable for NPI products.

Next, the on-line type consists of three function that are spraying, preheating, and soldering. With Maximum PCB dimension of 400mm, it’s suitable for high-quality and small batch production.

Last one is integrated on-line type, with maximum PCB size of 600mm and optional for double-solder machine, it’s suitable for massive production

Types of Selective Soldering Machines

Two-modules Integrated Selective Wave Soldering Machine

Key Features and Components of Selective Soldering Machines

Selective soldering machines are a specialized type of equipment used in electronics manufacturing to solder specific areas of a printed circuit board (PCB) with high precision. This machine is particularly useful for soldering through-hole components in areas where traditional wave soldering or reflow soldering methods might be challenging due to nearby sensitive components, heat-sensitive materials, or complex layouts.

Selective soldering machines consist of the following key components and features:

Solder Nozzle/Tool

The selective soldering machine uses a solder nozzle or tool to accurately apply solder to specific through-hole components or areas on the PCB. This allows for targeted soldering without affecting nearby components.

Fluxing System

Flux is often applied to the targeted soldering areas before soldering to improve wetting and bonding. The machine may have a built-in fluxing system to ensure precise flux application.

Soldering Tip Temperature Control

The machine’s soldering tip or nozzle is heated to the appropriate temperature for soldering. The temperature is carefully controlled to prevent overheating or damaging nearby components.

Vision System

Many selective soldering machines are equipped with a vision system, including cameras and alignment algorithms, to accurately locate the soldering points on the PCB. This ensures precise placement of solder.

XYZ Motion System

The machine’s XYZ motion system allows precise movement of the soldering tool over the targeted areas on the PCB. This system ensures that the soldering is carried out accurately and consistently.

Solder Reservoir and Pump

The machine has a solder reservoir that holds the solder alloy. A pump controls the flow of solder to the soldering nozzle, ensuring a controlled and consistent solder flow.

Control Unit

The control unit manages various parameters, such as solder temperature, flux application, solder flow rate, and motion control. It ensures accurate and repeatable soldering results.

Advantages of Selective Soldering Machines

Key advantages of selective soldering machines include:


Selective soldering allows for accurate and targeted soldering of specific components or areas without affecting other parts of the PCB.


These machines can handle complex PCB layouts and intricate soldering requirements.

Heat Management

Since only specific areas are soldered, heat-sensitive components or materials are less likely to be affected.

Reduced Defects

Precise control and automated processes contribute to fewer soldering defects and better overall solder quality.

Limitations of Selective Soldering Machines

Some limitations to consider:


Selective soldering machines are typically more expensive than traditional wave soldering machines.


Selective soldering may be slower than traditional wave soldering methods, making it more suitable for small to medium production volumes or situations where precision is crucial.

Types of Selective Soldering Systems

There are several types of selective soldering technologies:

Miniature Wave

Uses a mini localized solder wave to target specific areas. Good for highly repetitive applications.


Features multiple solder wave nozzles for increased flexibility and productivity.


Uses drop-by-drop solder extrusion for very localized soldering.


Focuses a laser onto components to melt solder already applied there. Highly precise.

Resistance Soldering

Uses electric current passing through a soldering head to generate heat through resistance.

Applications of Selective Soldering Machines

Selective soldering is used across various industries:

Aerospace and Defense

For soldering mission-critical aerospace and military electronics where reliability is paramount.


Allows soldering electronic modules and sensors in vehicles while avoiding heat damage.

Medical Devices

Suitable for accurately soldering thermo-sensitive medical device circuit boards.

Consumer Electronics

Allows complex consumer device PCBs to be soldered without compromising nearby sensitive components.

Implementing Selective Soldering

To successfully implement selective soldering:

Programming and Fixtures

Program soldering pathways and create any necessary fixtures to hold boards.

Process Validation

Conduct trial runs to validate the selective soldering process meets quality requirements.

Operator Training

Train machine operators on proper operation, programming, and maintenance procedures.


Follow scheduled preventive maintenance and calibrate as needed to maintain performance.

Future Outlook for Selective Soldering

Some trends in selective soldering include:

More advanced vision systems and AI-enabled defect prevention

Multi-point selective soldering for increased throughput

Adoption of Industry 4.0 practices for data collection and analysis

Focus on reducing solder use through highly targeted application

Integration with inline inspection systems for rapid feedback


Selective soldering machines enable precise, controlled soldering of specific components on complex PCB assemblies. They help mitigate soldering defects while managing challenging layouts and heat-sensitive components. When implemented properly, selective soldering systems provide electronics manufacturers with a valuable tool for enhancing quality and process control.

Learning Has No Limits

ElectronicsTalk aware of this philosophy all the time, like the over 2 decades we are still serving countless individual for their PCB assebly business, check the guide we prepared here for SMT Conveyor.