Portable CRX-3iA Robotic System for Industrial Welding Applications

FANUC has extended its CRX series with the introduction of the CRX-3iA, the company's lightest and smallest collaborative robot developed for portability and rapid deployment. The unit is designed to optimize applications requiring frequent relocation, such as welding large structures in shipbuilding and steel construction, as well as mobile intralogistics tasks.

 

Lightweight Design and Precision Welding

Weighing 11 kg with a 3 kg payload capacity, the CRX-3iA allows an operator to carry and reposition the unit with one hand. It is capable of simultaneously manipulating a welding torch and a seam-tracking sensor while maintaining a precision repeatability of ±0.02 mm. Upon relocation, the robot automatically detects its installation angle and utilizes a third-party laser scanner or touch sensor to identify weld seam locations and calculate paths. An optional magnetic base enables direct attachment to large steel structures, reducing the system complexity and safeguarding measures typically required for standard robot installations.

 

Integration and Programming

The CRX-3iA integrates fully with FANUC’s established control and software ecosystem, which encompasses the wider CRX series featuring payloads up to 30 kg and reaches up to 1,756 mm. The new model incorporates wrist button technology, enabling operators to guide and teach positions directly from the robot arm without utilizing the FANUC Teach Pendant. This direct-teach functionality is intended to streamline programming and shorten changeover times between tasks.

 

Cross-Industry Applications

Beyond welding operations, the low mass and compact footprint of the CRX-3iA facilitate its deployment in mobile automation. The unit is suited for mounting on automated guided vehicles (AGVs) to support picking, placing, and line supply operations. According to Paul Ribus, FANUC’s Head of Sales Coordination Europe, the development of the CRX-3iA focused on portability, fast deployment, and high repeatability to enable collaborative welding and handling without complex installation. Its compact size also provides application opportunities in education and training environments characterized by space constraints.

 

Additional Context

The introduction of highly portable "cobots" (collaborative robots) like the CRX-3iA addresses a specific logistical challenge in heavy industry: when manufacturing monolithic structures like ship hulls or architectural steelwork, bringing the workpiece to a fixed robotic cell is physically impossible. The 11 kg total mass of the CRX-3iA is technically significant because it falls well below standard occupational health and safety limits for single-person manual lifting, eliminating the need for hoists or multi-person teams during redeployment.

 

Technically, the robot's ability to automatically detect its installation angle (gravity vector compensation) is a critical feature for a magnetically mounted system. Because the base may be attached to sloped or vertical steel plates, the robot controller must mathematically adjust its kinematic model in real-time to account for gravity acting on its joints from non-standard angles. Combined with ±0.02 mm repeatability and active seam tracking, this ensures the robot can maintain the precise travel speed and torch angle required for uniform weld penetration, even when temporarily deployed in unstructured environments.

 

Edited by Romila DSilva, Induportals Editor, with AI assistance.

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