Adaptive robotic welding that starts with the truth: The groove you actually have.
About the writer:
Miika Kartano, Application Manager, Robotics
In heavy manufacturing, the weld you designed is rarely the weld you meet. Plate tolerances, fit-up variation, and heat distortion change joint geometry from part to part. Adaptive robotic welding addresses this reality by measuring the actual groove first—and only then generating the weld plan.
Pemamek’s approach is based on “scan first, then weld.” Every PEMA robot welding station comes equipped with PEMA WeldControl software. For heavy manufacturing, the software is called PEMA WeldControl 300 Offline, which, as the name suggests, includes offline programming as a standard feature.
PEMA Scan is an additional software that integrates seamlessly with it and extends its capabilities with laser-based measurement and automatic pass adaptation. The implications for both your production process and your business are substantial—but before diving into specifics, let’s look at what PEMA Scan does.
Turning real geometry into welds
PEMA Scan is Pemamek’s scanning and pass-planning layer for multi-pass welding. Before the arc starts, a laser sensor measures the joint to capture the position and the exact groove profile. The measured geometry is presented to the operator, and the software adapts every pass of the sequence—root, fill, and cap—to what was actually scanned. The result is accurate bead placement, even fill, and reduced rework despite preparation-caused deviations. This pass-by-pass adaptation is a defining capability of PEMA Scan and one that remains unique in the market.
Two practical outcomes follow. First, the process becomes less sensitive to fit-up variation: instead of forcing a nominal sequence onto an off-nominal groove, the plan conforms to reality. Second, results become repeatable with fewer interventions: torch position, angles, travel speed, and weaving are driven by the adapted sequence rather than manual trial-and-error.
How the workflow runs
The typical cycle is straightforward:
- Scan. The laser sensor head sweeps the joint to record groove widths, depths, and offsets. The operator reviews the measured profile.
- Adapt. The operator selects or builds a multi-pass sequence for that exact groove and stores it to a reusable library for similar work.
- Execute. The robot welds according to the adapted passes; if needed, real-time laser tracking maintains torch alignment against minor movement or thermal drift.
The numbers that matter
Scan delivers the biggest impact on large, multi-pass joints where geometry drifts most: nozzle connections in pressure vessels, thick-section fabrications, and complex heavy-equipment frames. These applications benefit from measuring once and letting the software shape each pass to the actual groove.
A concrete example comes from NWP Industries in Canada. After installing a PEMA robotic nozzle welding station equipped with Pemamek’s adaptive technologies, NWP reports improved consistency, quality, and speed, along with reduced repair rates. NWP targets 60–70% time savings on nozzle welding—an outcome that directly affects throughput and margins.
For production managers and operators
With Scan in place, cycle times fall into a predictable range even when joint geometry varies—especially on nozzle connections and other thick-section multipass work. Because each pass is adapted to the measured groove, rework becomes the exception, not the rule.
Standardization is simple: start from a proven library sequence, let the system tailor it to the joint, then refine and reuse it across similar parts.
For CEO’s and CFOs
With Scan, robot stations produce consistent output instead of chasing variation, increasing utilization and stabilizing throughput. Your welders can focus on tasks that truly require manual expertise while high-volume multi–pass work proceeds in the cell with reliable quality.
The impact is quantifiable: customer results such as NWP’s 60–70% time-savings target on nozzle welding provide a concrete benchmark for payback and margin improvement.
Keys to a smooth implementation
Finally, lean on the sequence library. Use proven multi-pass templates, let Scan tune them with actual measurements, and then lock the best versions for repeat work—creating a feedback loop that steadily improves quality and cycle time.
The bottom line
PEMA WeldControl 300 Offline with PEMA Scan reduces dependence on perfect prefabrication by turning real geometry into automated multi-pass planning and execution. The result is fewer surprises, fewer repairs, and throughput you can schedule. For shops moving to adaptive welding, the first question is simple: Do we know the groove we really have? With PEMA Scan, you do—before you strike the arc.
