Small Precision Medium Frequency Inverter DC Spot Welder | Welding Equipment for Stainless Steel, Copper, Aluminum & Electronic Components

Precision Spot Welder Series

1. Product Overview

• This series of medium frequency inverter DC spot welders are developed for high-precision welding of thin materials. Adopting medium frequency inverter DC output technology, they are suitable for high-standard welding processes of stainless steel, copper, aluminum, galvanized sheets, nickel strips, electronic pins and precision hardware parts.
• The equipment delivers smooth, bright solder joints free of blackening, dents and spatter without workpiece deformation, featuring consistent nugget quality. It is widely applied in electronic manufacturing, precision hardware and new energy component processing.

2. Five Core Advantages

• Ultra-High Welding Precision

Medium frequency inverter DC output eliminates zero-crossing and fluctuation for consistent and stable nuggets. Millisecond-level precise closed-loop control over current and time completely avoids cold solder joints, disconnection and over-welding. Tiny, clean solder joints require no post-polishing.

• Wide Application Range

It stably welds stainless steel terminals, copper sheets, aluminum sheets, nickel strips, electronic pins, thin multi-layer materials and precision assemblies, with minimal risk of burn-through and deformation.

• Stable & Durable, Low Maintenance Cost

Industrial-grade IGBT inverter modules ensure long service life and low failure rate. The integrated rigid mainframe maintains stable parameters during long continuous production. Reduced electrode wear greatly cuts consumable costs.

• User-Friendly & Easy Operation

7-inch industrial touch screen enables one-click recall of welding parameters with storage for multiple welding schedules to shorten model changeover without repeated debugging. Multiple alarm protections including overcurrent, overheating, water shortage and undervoltage are integrated for safe operation.

• High Energy Efficiency & Power Saving

Medium frequency inverter boasts higher conversion efficiency, saving over 30% power compared with traditional AC welders. High power factor balances three-phase load with no extra power capacity expansion required for factories.

3. Detailed Intelligent Core Functions

• Multiple Control Modes & Adjustable Frequency

6 professional control logics are built-in: primary peak constant current, secondary constant current, constant voltage, constant power, constant pulse width and hybrid control to adapt to complex welding processes.

Welding frequency can be adjusted among 1kHz/2kHz/3kHz/4kHz/5kHz with fast control response and high precision for stable welding performance of dissimilar metals.

4. Built-In Real-Time Welding Waveform Detection

• Equipped with a built-in waveform acquisition module, the machine simultaneously displays 8 sets of real-time waveform data including welding current, voltage, power and dynamic resistance for intuitive monitoring of each solder joint forming status.
• It integrates multi-level fault self-diagnosis, welding protection and sound-light alarm functions. Multi-stage discharge, current ramp-up and ramp-down functions effectively suppress welding spatter and further improve joint quality.

5. Automatic Weld Quality Judgment System

• Threshold upper and lower limits can be customized for real-time monitoring of current, voltage and power. An abnormal alarm triggers once output exceeds preset limits.
• The machine records full data (current, voltage, power and fault logs) of each solder joint in table format, supporting USB export to realize full-process weld traceability and meet quality management system standards.

6. Multiple Welding Schedules & Full Interfaces for Automation Communication

• 32 groups of welding parameter storage are pre-installed and expandable to satisfy multi-specification production changeover. Complete IO terminals are equipped to support multiple industrial communication protocols including MODBUS, RS232, RS485 and Ethernet for seamless integration with automated production lines and manipulators.

7. 7-Inch Industrial Touch Control Panel

• All parameter setting, function switching and waveform monitoring can be completed on the 7-inch industrial touch screen with visualized operation for quick debugging even for new operators.

8. Product Specification Table

Item	IDW-5100	IDW-8100
Input Power Supply	3φ380V±10%, 50/60Hz	3φ380V±10%, 50/60Hz
Max Short-circuit Current	5000A	10000A
Inverter Frequency	1–5kHz	1–5kHz
Control Mode	Primary constant current, secondary constant current; optional secondary constant voltage, constant power, constant conduction angle, combined current & voltage control	Primary constant current, secondary constant current; optional secondary constant voltage, constant power, constant conduction angle, combined current & voltage control
Electrical Parameter Adjustment Range	300–5000A	300–10000A
Rated Power (5% Duty Cycle)	13.1kVA	22.0kVA
Secondary No-load Voltage	9.8V	9.8V
Cooling Method	Forced Air Cooling	Forced Air Cooling
Communication Method	RS485, Ethernet optional	RS485, Ethernet optional
Structural Feature	Integrated type, side outlet	Separate power source and transformer
Welding Transformer	Built-in air-cooled transformer	External independent transformer

9. Applicable Industries & Workpieces

• Spot welding of electronic components, precision hardware terminals, lithium battery nickel strips, stainless steel thin sheets, copper & aluminum conductive sheets, galvanized plates, small home appliance parts, sensor pins and wire harness terminals.

Precision Spot Welder Series