Engineering Review: Deep Penetration 6-Axis Collaborative Welder – Manchester, UK

Field Report: Deployment of 6-Axis Collaborative Welder in Manchester Heavy Engineering Sector

Executive Summary of On-Site Operations

This report details the technical implementation and performance metrics of a 6-Axis Collaborative Welder deployed at a medium-to-heavy fabrication facility in Manchester, UK. The objective was to transition specific high-volume sub-assemblies from manual processes to Automated Welding to address throughput bottlenecks. The focus remained on deep-penetration Carbon Steel welding, specifically targeting S355JR grade structural components.

The Manchester site presents typical challenges: a legacy workshop environment with variable ambient temperatures and a requirement for high-integrity joints that meet BS EN ISO 15614-1 standards. The integration of a 6-Axis Collaborative Welder into this workflow marks a significant shift in how we approach small-to-medium batch production in the North West industrial corridor.

The Technical Synergy: 6-Axis Flexibility and Automated Welding

Breaking the Traditional Automation Barrier

Historically, Automated Welding in Manchester’s heavy industry was confined to large-scale, fixed robotic cells. These required extensive safety guarding and a massive footprint. The 6-Axis Collaborative Welder changes this dynamic by allowing human operators to work alongside the machine without physical light curtains or interlocked fencing, provided a thorough risk assessment is completed.

The synergy here lies in the “6-axis” capability. Carbon Steel welding often involves complex geometries—fillets, laps, and multi-pass grooves—that require the torch to maintain a specific work angle and travel angle simultaneously. A 3-axis or 4-axis system lacks the dexterity to mimic the human wrist. By utilizing a 6-Axis Collaborative Welder, we achieved the torch manipulation necessary to maintain the arc at the leading edge of the puddle, which is critical for achieving deep penetration in thick-walled carbon steel.

Workflow Integration in Manchester Workshops

In the Trafford Park facility, floor space is at a premium. The 6-axis system was mounted on a mobile plinth, allowing it to be moved between welding bays. This portability is the cornerstone of modern Automated Welding. We are no longer bringing the work to the robot; we are bringing the automation to the workpiece. This reduces crane time and material handling, which were previously identified as the two primary non-value-added costs in our Manchester operations.

Deep Penetration Carbon Steel Welding: Technical Parameters

Material Composition and Prep

The primary focus of this deployment was Carbon Steel welding on 12mm to 20mm plate. Carbon steel, while forgiving in manual applications, requires precise heat management when automated. We utilized an S355JR substrate. The presence of mill scale was a primary concern; we implemented a mandatory mechanical cleaning zone 25mm from the joint to ensure arc stability and prevent porosity in the deep penetration root passes.

The Role of the 6-Axis Collaborative Welder in Joint Tracking

Achieving deep penetration consistently requires the 6-Axis Collaborative Welder to maintain a tight CTWD (Contact Tip to Work Distance). In our Manchester trials, even a 2mm variance in CTWD resulted in significant fluctuations in current density and, consequently, penetration depth.

We utilized the cobot’s integrated “Through-Arc Seam Tracking” (TAST). As the 6-axis arm weaves across the joint, the controller monitors changes in welding current. If the arm moves further from the joint, the current drops; the system then compensates in real-time. This level of Automated Welding precision ensures that the root run achieves the required fusion without the risk of burn-through or cold-lapping.

Voltage and Current Mapping for S355 Carbon Steel

For the 15mm fillet welds, the following parameters were established:

  • Process: GMAW (Gas Metal Arc Welding) – Spray Transfer Mode
  • Wire: 1.2mm A18 (ER70S-6)
  • Gas: 80% Argon / 20% CO2 (to balance penetration depth with spatter control)
  • Current: 280A – 310A
  • Voltage: 28V – 30V
  • Travel Speed: 350mm/min

Lessons Learned from the Manchester Field Trials

1. Managing Heat Input in Automated Welding

One of the most immediate lessons learned was the difference in heat saturation between manual and Automated Welding. Because the 6-Axis Collaborative Welder does not require “hand-rests” or “breathers,” the duty cycle increased from 30% (manual) to nearly 85% (automated).

On thick Carbon Steel welding, this leads to rapid heat buildup in the workpiece. In Manchester, we found that without programmed inter-pass temperature checks, the Heat Affected Zone (HAZ) expanded beyond acceptable limits, impacting the mechanical properties of the S355 steel. We adjusted the logic to include a “cooling dwell” or a sequence-skip pattern to manage thermal distribution.

2. Programming for the “Real World”

In a controlled lab, every joint is perfect. In a Manchester fab shop, parts arrive with fit-up gaps and slight tack-welding misalignments. The lesson here is that the 6-Axis Collaborative Welder must be programmed with “fuzzy” logic. Instead of a rigid path, we utilized “Touch Sensing.” The robot uses the welding wire or a gas shroud to touch the workpiece at three points before starting the arc, allowing the 6-axis controller to shift the entire program path to match the actual position of the Carbon Steel assembly.

3. The Human-Robot Interface (HRI)

The “Collaborative” aspect of the 6-Axis Collaborative Welder is its greatest asset in a site like Manchester, where veteran welders may be skeptical of automation. We found that by involving the manual welders in the “Lead-Through” programming—where they physically move the robot arm to teach the path—the adoption rate skyrocketed. The welder transitions from a manual laborer to a “Cell Supervisor.” They use their intuitive knowledge of Carbon Steel welding (recognizing the sound of the arc and the look of the puddle) to fine-tune the automated parameters.

Technical Challenges and Resolutions

Addressing Wire Feed Consistency

During the first week, we experienced intermittent arc instability. Investigation revealed that the 6-axis movement was causing slight kinking in the conduit when the arm reached its maximum extension.
* **Resolution:** We switched to a low-friction “marathon pack” wire delivery system and installed a 360-degree swivel at the torch head. In the context of Automated Welding, wire delivery is often the weakest link; ensuring a smooth cast and helix from the drum to the contact tip is paramount.

Spatter Management in Deep Penetration Runs

Deep penetration Carbon Steel welding in spray transfer mode inevitably generates some spatter, despite optimized gas mixtures. For a 6-Axis Collaborative Welder, this spatter can foul the sensors or the nozzle, leading to gas shielding turbulence.
* **Resolution:** We integrated an automated nozzle cleaning station. Every five cycles, the robot moves to a reaming station that clears the shroud and applies anti-spatter dip. This eliminated the porosity issues we saw in the mid-shift samples.

Conclusion: The Future of Fabrication in the North West

The deployment of the 6-Axis Collaborative Welder in Manchester has proven that Automated Welding is no longer the exclusive domain of automotive giants. For Carbon Steel welding, the 6-axis system provides the necessary dexterity to replace strenuous, repetitive manual welds with high-precision, repeatable results.

The key to success was not just the hardware, but the integration of “welding intelligence” into the software. By respecting the metallurgical requirements of carbon steel and leveraging the flexibility of a 6-axis platform, we have increased production capacity by 40% while simultaneously reducing the rate of weld defects. Moving forward, the focus will remain on refining TAST (Through-Arc Seam Tracking) parameters to further reduce the need for manual intervention during long-seam structural welds.

Report Signed:
Senior Welding Engineer
Manchester Field Office

Advanced Programming: OLP vs. Teaching-Free System

For large-scale gantry welding, manual "point-to-point" teaching is inefficient. PCL offers two cutting-edge solutions to minimize downtime and maximize precision. Understanding the difference is key to choosing the right automation level for your factory.

SOFTWARE-BASED

Off-line Programming (OLP)

OLP allows engineers to create welding paths in a 3D virtual environment using CAD data (STEP/IGES).

  • Zero Downtime: Program the next job on a PC while the robot is still welding.
  • Collision Detection: Simulates the gantry movement to prevent accidents in a virtual space.
  • Best For: Complex workpieces with high repeat rates and detailed weld joints.
AI & SENSOR BASED

Teaching-Free Welding System

Uses 3D laser scanning or vision sensors to "see" the workpiece and generate paths automatically without any CAD data.

  • Instant Setup: No manual coding or 3D modeling required; just scan and weld.
  • High Flexibility: Ideal for "One-off" parts where every workpiece is slightly different.
  • Real-time Adaptation: Automatically compensates for thermal distortion and fit-up gaps.
  • Best For: Custom fabrication, repairs, and low-volume/high-mix production.
Feature Off-line Programming (OLP) Teaching-Free System
Input Required CAD 3D Models 3D Laser Scanning
Programming Time Minutes to Hours (Off-site) Seconds (On-site)
Ideal Production Mass Production / Batch Work Custom / Single Unit Work
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One thought on “Engineering Review: Deep Penetration 6-Axis Collaborative Welder – Manchester, UK”

  • Jason Tech Fab

    Impressive performance on complex tube geometries. No deformation at all.

    Reply

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