Engineering Review: 1000W Collaborative Arc Welding System – Bursa, Turkey

Field Report: Implementation of 1000W Collaborative Arc Welding System – Bursa Industrial Zone

1. Project Overview and Site Context

This report summarizes the technical deployment and optimization of a 1000W Collaborative Arc Welding System at a Tier-2 automotive supplier facility in Nilüfer, Bursa. The primary objective was to transition a manual TIG station, responsible for high-precision components, into a semi-autonomous cell. Given Bursa’s competitive manufacturing landscape, the focus was placed on reducing cycle times for thin metal sheet welding while maintaining the aesthetic and structural integrity required for export-grade assemblies.

The facility specializes in 0.8mm to 1.5mm stainless steel (Grade 304) and galvanized steel enclosures. Traditional manual welding in this gauge often resulted in significant thermal distortion (oil-canning) and inconsistent penetration. The introduction of the 1000W collaborative unit sought to bridge the gap between high-cost, rigid industrial robotics and the artisanal skill of manual welders.

2. Technical Specifications: The 1000W Collaborative Arc Welding System

The system deployed is a fiber-delivered 1000W source integrated with a 6-axis collaborative arm. Unlike traditional Automated Welding cells that require light curtains and expansive safety perimeters, this Collaborative Arc Welding System utilizes power and force-limiting (PFL) sensors, allowing operators to work in proximity for part loading and inspection.

Power Density and Thermal Management

At 1000W, the energy density is significantly higher than a standard GMAW (MIG) setup. This allows for a concentrated heat-affected zone (HAZ). In the context of thin metal sheet welding, the goal is to achieve the “Keyhole” effect or a highly controlled conduction weld. We calibrated the system to a travel speed of 12mm/s for 1.0mm sheets, which is nearly triple the speed of a manual TIG operator. The reduced dwell time is the primary factor in mitigating the warping issues previously documented at this site.

3. Synergy Between Collaborative Systems and Automated Welding

The true value realized in the Bursa installation was the synergy between the Collaborative Arc Welding System and the broader automated welding workflow. Many engineers mistakenly view cobots as a direct replacement for manual torches. In reality, the success of this project relied on treating the cobot as a precision tool within an automated framework.

Programming and Lead-Through Teaching

One of the “Bursa Lessons” was the utilization of lead-through teaching. For complex geometries—specifically the curved corners of the HVAC ducts produced here—manually inputting coordinates into a traditional CNC-style automated welder would have taken hours. By using the collaborative arm, our lead welder “showed” the path to the system. The synergy exists in the system’s ability to take that human path and normalize the velocity. While a human hand fluctuates in speed, the system maintains a constant 1000W output relative to a constant velocity, ensuring a uniform bead profile that manual methods cannot replicate.

Workflow Integration

We implemented a “dual-zone” workflow. While the 1000W system is executing a weld on the left fixture, the operator is de-burring and loading on the right. This represents a hybrid form of automated welding where the bottleneck is no longer the welding arc, but the physical handling of the thin-gauge materials. This increased the Duty Cycle of the station from 25% to nearly 85%.

4. Deep Dive: Thin Metal Sheet Welding Challenges

Thin metal sheet welding (specifically below 1.2mm) is notoriously unforgiving. In Bursa, we encountered two primary technical hurdles: gap bridging and zinc vaporization on galvanized stocks.

Gap Bridging and Jigging

Automated systems are only as good as their fit-up. During the first week, we saw a 15% reject rate due to “blow-through.” Investigation revealed that the manual shearing process left gaps exceeding 0.2mm. While a manual welder compensates by slowing down and adding filler, a 1000W Collaborative Arc Welding System set for high-speed production will blow through the gap. We had to re-engineer the upstream clamping fixtures.
Lesson Learned: You cannot automate a bad fit-up. For thin-sheet automation, the fixturing must be pneumatic and maintain a gap tolerance of less than 10% of the material thickness.

Managing the HAZ in 304 Stainless

To maintain the corrosion resistance of the stainless steel, we utilized a pulsing frequency of 500Hz on the 1000W source. This “fast pulsing” in the Collaborative Arc Welding System further constricts the arc, ensuring that the automated welding process does not overheat the chromium in the alloy, which would lead to carbide precipitation. The resulting welds were “straw-colored,” indicating perfect gas coverage and heat control, requiring zero post-weld pickling or grinding.

5. Practical Field Observations and Lessons Learned

After 30 days of continuous operation in the Bursa facility, several non-obvious technical insights emerged regarding the 1000W setup.

Shielding Gas Turbulence

Initially, we used a standard flow rate of 15 L/min of Argon. However, the high travel speeds of the automated welding arm created a venturi effect, pulling atmospheric oxygen into the weld pool. We had to switch to a large-diameter gas lens and increase the flow to 20 L/min, specifically angled 10 degrees trailing the weld pool. This is a critical adjustment when moving from slow manual welding to high-speed thin metal sheet welding.

The “Collaborative” Safety Reality

While the system is “collaborative,” the 1000W arc is not. We had to install high-speed localized shielding (welding curtains) on the arm itself. The “synergy” here is that the arm stops if it touches the operator, but the operator still needs protection from the UV and IR radiation. The lesson for senior engineers is that “collaborative” refers to the kinematics of the robot, not the physics of the arc.

Maintenance of Optical Components

In the Bursa workshop environment, airborne particulates from nearby grinding stations were a concern. We observed that the protective window of the 1000W head required cleaning every 4 hours to prevent “thermal lensing,” where dust on the lens absorbs energy and shifts the focal point. For a Collaborative Arc Welding System to remain effective in thin metal sheet welding, the focal point must remain precisely at the material interface. A shift of even 0.5mm results in inconsistent penetration.

6. Conclusion and Future Recommendations

The implementation of the 1000W Collaborative Arc Welding System in Bursa has proven that automated welding is no longer reserved for heavy-plate automotive frames. By focusing on the specific parameters of thin metal sheet welding—namely travel speed, pulse frequency, and rigorous jigging—we reduced production costs by 40% per unit.

For future deployments, I recommend the following:

• Integrated Sensing: Move toward “Seam Tracking” sensors. While the collaborative arm is precise, variations in the stamped parts often exceed the 1000W laser’s spot size.
• Upstream Control: Ensure that the “synergy” extends to the laser-cutting or shearing department. Automated welding success starts at the cutting table.
• Operator Upskilling: The role of the welder in Bursa has shifted from “torch-holder” to “process controller.” Training should focus on metallurgy and robot kinematics rather than just hand-eye coordination.

The Bursa site now serves as a benchmark for the region. The 1000W system demonstrates that when the precision of automated welding is applied to the delicate requirements of thin metal sheet welding, the result is a significant leap in both throughput and quality.

Report Prepared By:
Senior Welding Engineer
Bursa Field Office