Office Chair Frame Welding

The automated solution for office chair frame welding involves using the HIT Robot Group's arc welding robot HA006B in combination with welding fixtures and positioners. The core process is Metal Active Gas (MAG) welding, with Tungsten Inert Gas (TIG) welding used as a supplementary process for repair welding.

Limitations of Traditional Manual Welding

When manually welding office chair frames, issues such as inconsistent weld formation and unattractive appearance arise, leading to low production efficiency and unstable product quality. Manual operations struggle to maintain consistent welding parameters, especially in complex structures or multi-angle welding scenarios, where defects like uneven weld reinforcement and undercutting are common, affecting the overall strength and aesthetics of the product.

Automated Welding Solution

Currently, the solution combining the HIT Robot Group's arc welding robot HA006B with welding fixtures and positioners has been applied to office chair frame welding. The process flow includes:

1. Workpiece Installation: The chair frame is fixed using specialized fixtures to ensure precise welding positions;
2. Rapid Welding: The robot completes automated welding of core welds according to preset programs;
3. Positioner Rotation: The positioner adjusts the workpiece angle to enable multi-sided welding;
4. Automatic Nozzle Cleaning and Wire Cutting: During welding, the nozzle is automatically cleaned, and the wire is cut, reducing manual intervention;
5. Continuous Operation: The robot can operate continuously, significantly improving production efficiency.

The technical highlights of this solution include:

• Precise Control: The robot maintains stable welding parameters, resulting in uniform weld formation and a lower defect rate compared to manual welding;
• Multi-Product Compatibility: By adjusting programs and fixtures, it can adapt to the welding needs of different chair frame models;
• Multi-Angle Welding: The positioner, in coordination with the robot, enables 360° welding without dead zones, meeting complex structural requirements;
• Efficient Production: A single robot can replace 2-3 welders, increasing daily production capacity by over 50%.

Basis for Welding Process Selection

The commonly used materials for office desks and chairs are Q235 cold-rolled steel plates (thickness 1.5-3mm) and 20 seamless steel pipes (wall thickness 1.2-2.5mm). Considering structural complexity, production efficiency, and quality requirements:

• Core Process: MAG Welding Using an 80% Ar + 20% CO₂ shielding gas mixture, it offers moderate penetration (2-4mm), high deposition efficiency (approximately 5-8kg per hour), and uniform weld formation. The overall cost is over 30% lower than TIG welding, making it suitable for mass production.
• Supplementary Process: TIG Welding Used for repairing local defects (such as porosity and cracks), it features a stable arc and low heat input, enabling high-quality single-sided welding with double-sided formation. However, its efficiency is lower, so it is only used as a supplementary process.