SIASUN Industrial Robot Arm with 2010mm Reach, 12kg Max Payload, 6 DOFs (SR25A-12/2.01)

Anyone who has watched an arc-welding robot work a deep fixture knows the real enemy is rarely the weld itself. It is the hose package: the torch cable swinging round the forearm, catching on clamps, wearing through its sleeve and nudging the wire feed off its rhythm just when the seam needs it most. The SIASUN Industrial Robot Arm with 2010mm Reach, 12kg Max Payload, 6 DOFs (SR25A-12/2.01) is built around removing that problem. Its welding cable runs inside a hollow, streamlined bow arm and its wire feeder sits within the robot body, so the arm can reach into crowded workpieces without dragging its own supply lines behind it.

Robots Europa, based in Dublin, supplies the SR25A-12/2.01 to manufacturers and system integrators 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 installed.

Background

SIASUN and its robotics lineage

SIASUN is a Chinese robotics and automation group headquartered in Shenyang, with its origins in the research environment of the Chinese Academy of Sciences' Shenyang Institute of Automation. Over the years it has built a broad portfolio covering industrial robot arms, mobile robots and complete automation lines. The SR series of articulated arms spans a wide range of payload classes, from compact models for light handling up to heavy-duty machines for large castings and body-in-white work, which allows a plant to standardise on one manufacturer and one controller family across very different cells.

A welding robot designed from the inside out

The SR25A-12/2.01 belongs to SIASUN's SR25A family and is positioned as a long-reach arm for welding-intensive fabrication. Rather than treating cable management as an accessory, SIASUN has made it part of the structure. The hollow bow-arm geometry reduces interference with workpieces, which gives programmers more freedom in torch orientation and allows a more compact cell layout. The built-in welding cable system protects the cable from external wear and steadies wire feeding, while the compactly integrated wire feeder further improves feeding stability. The arm is cast from automotive engine-grade aluminium alloy using a special casting process, making it 25% lighter than the previous generation. Repeat positioning accuracy is 40% higher and operational efficiency 67% greater than on that predecessor.

Technical Specifications

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

SIASUN has not published the robot's weight, its maximum joint speeds, axis motion ranges, power supply voltage, operating temperature range, wrist moment and inertia ratings or the list of included accessories; Robots Europa confirms these at quotation.

Why does an internal welding cable and integrated wire feeder matter?

On a conventional arm, the torch cable and wire conduit are dressed along the outside of the upper arm and forearm. Every reorientation of the wrist twists, bends and rubs that package, and the effects are cumulative: abrasion against fixtures, conduit kinks that disturb wire feeding, and programmers forced to choose torch angles that protect the cable rather than suit the joint. Routing the welding cable inside the arm addresses each of these at once. The cable is shielded from external wear, the wire path stays consistent from one posture to the next, and the outer envelope of the robot becomes smoother and more predictable.

Placing the wire feeder within the robot body completes the picture. A shorter, more stable feed path supports consistent wire delivery, and there is no bulky feeder unit hanging off the arm to collide with clamps or neighbouring robots. Combined with the hollow bow-arm shape, which reduces interference with the workpiece, this means the SR25A-12/2.01 can work closer to tooling and in tighter cells. With a reach of 2010mm, the arm covers large weldments while keeping the footprint of the cell compact, and the IP65 wrist protection suits the spatter and dust of a fabrication hall.

How does the SR25A-12/2.01 compare with the previous generation?

The SR25A-12/2.01 is a clear step forward from its predecessor rather than a cosmetic refresh. The aluminium casting brings the arm's weight down by 25%, which lowers the inertia the drives must manage and is relevant wherever the robot is mounted on a gantry, a track or an inverted bracket. Repeat positioning accuracy improves by 40%, reaching ±0.07mm on this model, which matters for seam tracking and for consistent bead placement across a batch. Operational efficiency is up by 67%, a figure that points to shorter cycle times on the same weld programme. The model also supports multiple installation modes, so integrators can choose the arrangement that best suits a confined space.

Who is the SR25A-12/2.01 for?

The primary buyers are fabrication plants that weld large or awkwardly shaped parts: manufacturers of heavy machinery, shipyards producing sub-assemblies, automotive suppliers and railway vehicle builders. These are the sectors this model is built to serve, and they share the same needs — long reach to cover big weldments, a torch that can get into corners without fouling its own cable, and stable wire delivery over long shifts.

System integrators building turnkey welding cells across Europe form a second group. The integrated cable and feeder simplify cell design, reduce the number of dress-pack components to specify and make layouts with several robots working side by side easier to plan. Operations already running SIASUN equipment will also value staying within one controller family; this model uses the SRC E5 controller.

Not every application calls for this combination of reach and welding integration. Buyers working in tighter cells may wish to compare the SIASUN Industrial Robot Arm with 1465mm Reach, 12kg Max Payload, 6 DOFs (SR12A-12/1.46), while those whose tooling requirements differ can look at the SIASUN Industrial Robot Arm (SR25A-25/1.80) from the same SR25A family. The wider selection is available in our Robot Arms category, and Robots Europa can advise on which model fits a given cell.

What is the SR25A-12/2.01 used for?

1. Heavy machinery fabrication: arc welding of frames, booms and structural assemblies where long reach covers large parts.
2. Shipbuilding: welding of sub-assemblies and panels in cramped stations where a clean arm envelope avoids collisions.
3. Automotive manufacturing: welding of chassis and component assemblies with consistent, repeatable torch positioning.
4. Railway vehicle production: joining long body and underframe sections that demand both reach and stable wire feeding.
5. Confined-space welding cells: installations where multiple mounting modes and a hollow bow arm keep the layout compact.
6. Multi-robot welding lines: stations with several arms working close together, helped by reduced interference and no external feeder unit.

Pricing and Availability

Robots Europa supplies the SR25A-12/2.01 on a quotation basis, so that the configuration, controller, welding package and any integration work can be specified to suit your production. Delivery, customs and support are arranged together with the quotation. To begin, send us your application details and the parts you intend to weld, and request your quotation using the form available on this page.

Frequently Asked Questions

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

The SR25A-12/2.01 handles a payload of 12 kg (26.5 lbs) and has a reach of 2010mm.

How repeatable is the robot?

Repeatability is ±0.07mm, and repeat positioning accuracy is 40% higher than on the previous generation.

Is the SR25A-12/2.01 designed for welding?

Yes. It has a built-in welding cable system and a wire feeder integrated into the robot body, both of which improve wire feeding stability and protect the cable from external wear.

Which controller does it use?

The robot is paired with the SIASUN SRC E5 controller, with a power capacity of 3 KVA.

What protection rating does it have?

The wrist carries an IP65 protection rating.

Can it be installed in confined spaces?

Yes. The model supports multiple installation modes and its hollow bow-arm design reduces interference with workpieces, which makes it well suited to compact cells.

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

Robots Europa supplies the SR25A-12/2.01 across the EU and the DACH region. Pricing depends on configuration and integration scope, so it is provided in a tailored quotation that you can request on this page.

Summary

The SR25A-12/2.01 answers a problem every welding cell knows: the hose package that snags, wears and unsettles the wire feed. By carrying its welding cable inside a hollow bow arm and building the wire feeder into its body, it keeps its outline clean and its feeding stable, while its 2010mm reach, 12 kg payload and ±0.07mm repeatability suit large fabricated parts in heavy machinery, shipbuilding, automotive and railway production. A lighter aluminium structure and clear gains over the previous generation round out the case. For manufacturers and integrators in Europe who want to discuss configuration, mounting and delivery with Robots Europa, this page is the starting point.