SIASUN SR25A-12/2.01 (SR25A-12/2.01)

In many arc welding cells, the arm itself is rarely the problem. The cable bundle hanging along its outside is. It catches on clamps, rubs against fixtures and tugs at the wire feed every time the wrist turns. The SIASUN SR25A-12/2.01 takes a different approach. Its welding cable runs inside a hollow bow-shaped arm and its wire feeder sits within the robot body, so the torch can work close to the workpiece without dragging a hose package after it.

Robots Europa, based in Dublin, supplies the SIASUN SR25A-12/2.01 to customers across the European Union and the DACH region. Robots Europa prepares the quotation, arranges delivery to your site and remains your point of contact for support once the robot is in production.

Background

SIASUN and its industrial robot range

SIASUN is a Chinese manufacturer of robots and automation systems with a broad industrial robot programme. It runs from small-payload arms for welding and handling up to heavy-duty machines in the SR500A series. The SR25A family sits in the lower payload bracket of that range. Its versions are coded by payload and reach, and three appear in the sources for this page: the SR25A-12/2.01, the SR25A-25/1.80 and the SR25A-35/1.80. The full line-up can be browsed among the Industrial Robots.

A robot shaped around the welding process

SIASUN lists the SR25A-12/2.01 as one of the robot types in its arc welding robotic solution, alongside the SR12A-12/1.46. Its design follows from that role. The bow-arm is hollow and streamlined, which reduces interference with workpieces and allows a more compact cell layout. The welding cable is built in, which protects it from external wear and steadies the wire feed. The wire feeder is integrated compactly into the robot body, which further improves feeding stability. The structure is cast from automotive engine-grade aluminium alloy using a special casting process, and it weighs 25% less than the previous generation. For European buyers, the model has obtained CE certification under the EU Machinery Directive (MD) and the Electromagnetic Compatibility Directive (EMC).

Technical Specifications

Specifications are as published by the manufacturer and are confirmed against the datasheet at quotation.

The manufacturer has not published the robot weight, axis speeds, axis motion ranges, permissible wrist torque, operating temperature, mounting dimensions, cabling length or the contents of the box. These details are confirmed at quotation.

What makes the SR25A-12/2.01 different from a welding arm with an external hose package?

On a conventional welding robot, the cable bundle runs outside the upper arm and wrist. That brings two practical drawbacks. The bundle widens the space the robot sweeps, so fixtures and clamps must sit further away. It also flexes and rubs with every reorientation of the torch, which wears the cable and can disturb the wire as it travels to the torch.

The SR25A-12/2.01 addresses both points in its construction. The hollow bow-arm carries the welding cable internally, so the outer contour of the arm stays clean and interference with the workpiece is reduced. Because the cable is enclosed, it is protected from external wear, and SIASUN states that this improves wire feeding stability and widens the range of welding tasks the robot can take on. The wire feeder is built compactly into the robot body rather than mounted as a separate unit, which shortens the feeding path and further steadies the wire.

For the cell designer, the result is a robot that can be placed closer to the part. Fixtures can be denser and the overall footprint more compact. With IP65 protection at the wrist, the part of the robot nearest the arc is sealed against dust and water jets.

What has changed compared with the previous generation?

SIASUN quantifies the step forward in three figures, each measured against the earlier generation. Repeat positioning accuracy has increased by 40%, and the current model achieves a repeatability of ±0.07mm. Operational efficiency has been boosted by 67%. The robot structure weighs 25% less, thanks to the aluminium alloy casting process.

Together, these changes describe a lighter, stiffer arm that moves faster and returns more precisely to its programmed points. In welding, both qualities show up directly in seam quality and cycle time. A lighter structure also matters when the robot is mounted inverted, which the SR25A-12/2.01 supports alongside upright installation. The arm is driven by the SRC E5 controller, with a power capacity of 3 KVA.

Who is the SIASUN SR25A-12/2.01 for?

The first audience is the welding integrator who builds arc welding cells for fabrication customers. For this buyer, the internal cable routing and integrated wire feeder reduce the number of wear parts on the dress pack and simplify cell layout. The reach of 2010mm covers large workpieces from a single position.

The second audience is the manufacturer in the sectors SIASUN names for this model: heavy machinery, shipbuilding, automotive manufacturing and railway vehicle production. These are environments with long seams, bulky assemblies and often cramped workstations. There, support for multiple installation modes, including inverted mounting, lets the robot work from above or within confined spaces.

A third group is the European plant that must document conformity. The model's CE certification under the Machinery Directive and the EMC Directive gives a clear starting point for the plant's own conformity assessment of the finished cell.

Buyers comparing options within SIASUN's arc welding solution should also look at the SIASUN SR12A-12/1.46 (SR12A-12/1.46), the other robot type SIASUN lists for that solution. The fact sheet for this page carries no figures for it, so its own page is the place to compare. Within the SR25A family, the SIASUN SR25A-25/1.80 (SR25A-25/1.80) and the SIASUN SR25A-35/1.80 (SR25A-35/1.80) are further versions to review when a task calls for a different configuration. Their specifications are given on their own pages and do not apply to this model. Other compact arms are grouped under Small Payload.

What is the SIASUN SR25A-12/2.01 used for?

1. Heavy machinery fabrication: welding frames, booms and structural assemblies where long reach saves repositioning.
2. Shipbuilding: arc welding of sub-assemblies and panels in confined or awkward workstations.
3. Automotive manufacturing: repeatable welding of chassis and body components in production cells.
4. Railway vehicle production: joining large car body and bogie parts with consistent seam placement.
5. Compact welding cells: dense fixture layouts made possible by the hollow arm and its reduced interference with workpieces.
6. Inverted installations: overhead mounting to free floor space and approach the workpiece from above.

Pricing and Availability

Robots Europa supplies the SIASUN SR25A-12/2.01 on quotation. Each offer reflects your configuration, the welding process and the installation you have in mind. Tell us about the application, the workpieces and whether the robot will be mounted upright or inverted, and we will prepare the offer accordingly. Delivery, customs and support are arranged with the quotation. To request yours, use the quotation form available on this page.

Frequently Asked Questions

What payload and reach does the SIASUN SR25A-12/2.01 offer?

The robot handles a payload of 12 kg (26.5 lbs) and has a reach of 2010mm.

How precise is the SR25A-12/2.01?

Its repeatability is ±0.07mm, and SIASUN states that repeat positioning accuracy has increased by 40% compared with the previous generation.

Is the welding cable routed inside the arm?

Yes. The SR25A-12/2.01 has a built-in welding cable system inside its hollow bow-arm, which protects the cable from external wear and improves wire feeding stability. The wire feeder is also integrated into the robot body.

Can the robot be mounted upside down?

Yes. It supports upright and inverted installations, which makes it suitable for confined spaces and overhead cell designs.

Which controller does the SR25A-12/2.01 use?

It runs on the SIASUN SRC E5 controller, with a power capacity of 3 KVA.

Is the SR25A-12/2.01 CE certified?

Yes. The model has obtained CE certification under the EU Machinery Directive (MD) and the Electromagnetic Compatibility Directive (EMC).

Where can I buy the SIASUN SR25A-12/2.01 and what does it cost?

You can buy it from Robots Europa, which supplies customers across the EU and the DACH region. The cost depends on your configuration and is set out in a quotation, which you can request on this page.

Summary

The SIASUN SR25A-12/2.01 starts from the weak point of many welding robots: the cable bundle outside the arm. It removes that bundle from the workpiece's way. The welding cable runs inside a hollow bow-arm, the wire feeder is integrated into the body, and the wrist is protected to IP65. Around that core sit a payload of 12 kg (26.5 lbs), a reach of 2010mm and a repeatability of ±0.07mm. The structure is 25% lighter than its predecessor, with gains of 40% in repeat positioning accuracy and 67% in operational efficiency. Upright and inverted mounting, the SRC E5 controller and CE certification under the MD and EMC Directives round off a robot built for welding in heavy machinery, shipbuilding, automotive and railway production. If your next welding cell needs a robot whose cabling stays out of the way, this page is the starting point.