Chain welding machines are typically designed for flash butt welding of metal chain links.The basic principle is resistance butt welding:

Two ends of a chain link or steel wire are clamped tightly and pressed together

A high current, low voltage is passed through the contact area

High contact resistance generates intense heat, melting the surface rapidly

Under set forging pressure, the molten metal is extruded (forming flash)

The joint solidifies under pressure, forming a dense, high-strength weld

The entire process includes:Clamping → Preheating → Flash → Upsetting → Cooling → Releaseto complete one chain link welding.

Main Components

1. Welding Frame & Body

Heavy-duty rigid structure to resist upsetting force

Ensures stability during high-pressure welding

Prevents deformation that causes poor welding quality

2. Clamping Mechanism

Fixed clamp and moving clamp

Holds chain ends firmly during welding

Ensures concentric alignment and stable pressure

Usually driven by hydraulic or pneumatic system

3. Hydraulic / Pneumatic System

Provides upsetting pressure and clamping force

Controls moving speed during flash and upsetting

Ensures stable, adjustable pressure for consistent welds

4. Welding Transformer

Step-down transformer: high current, low voltage output

Converts mains power into welding power

Supports stepless adjustment of welding current

5. Control System

PLC + touch screen or relay control

Sets welding parameters: current, time, pressure, speed

Automatically completes the whole welding cycle

Includes fault detection and safety interlocks

6. Electrode / Clamp Jaws

Directly contact the workpiece

Made of wear-resistant, conductive copper alloy

Transmit current and transfer upsetting force

7. Feeding & Bending Mechanism (on automatic models)

Automatically feeds steel wire or chain

Bends material into chain-link shape

Transports links to welding station

8. Flash Removal & Cleaning Structure

Trims or cuts welding flash

Improves surface finish and chain appearance

9. Cooling System

Cools welding transformer, electrodes and clamps

Prevents overheating during continuous production

Extends service life of electrical parts

10. Safety Protection Devices

Emergency stop button

Safety guards and protective covers

Overcurrent, overheat, overload protection

Safety interlocks to avoid hand injury