Railway rolling stock manufacturing
Railway weld monitoring for EN 15085 rolling stock
Thermal and process records for every weld on car bodies, underframes and bogies: what they show, how a one-cell pilot runs and what goes into the EN 15085 file.
Automotive manufacturing and vehicle assembly · reference card
Weld monitoring for automotive manufacturing
High-volume resistance, laser and arc welding under sector-specific quality-system audits. The four monitoring pain points that cost automotive manufacturers most, and which Therness signal addresses each.
- Industry
- Automotive manufacturing and vehicle assembly
- Dominant processes
- Resistance spot welding on body-in-white structures; Laser welding on battery packs, busbars and powertrain components; Gas metal arc welding on chassis, subframes and heavy stampings; Projection welding on fasteners, brackets and nuts
Automotive welding is a volume argument before it is anything else. A single body-in-white line can produce more resistance spot welds in a shift than a structural fabricator makes in a year, and a battery-pack line adds laser welding on joints where the failure mode is electrical and thermal rather than mechanical. Manual inspection at that rate is not a policy choice; it is arithmetic.
IATF 16949, and the AIAG welding system assessment that OEM customer-specific requirements invoke alongside it, treat welding as a special process precisely because the alternative to monitoring, destructive sampling, cannot keep pace with production and cannot warn an assembler about a part that has already been built into a vehicle.
The two dominant processes fail differently. A resistance weld drifts gradually as an electrode wears; a laser weld on a thin battery tab can be wrong on the very first shot with nothing visible to show for it. A monitoring approach built for one does not automatically cover the other, which is why the evidence a special-characteristic audit asks for has to span both — see the inline weld inspection guide for how body-in-white and battery-tray lines are handled together in practice.
Governing codes
| Code | Why it applies |
|---|---|
| IATF 16949 | Automotive quality-management standard that treats welding as a special process, driving control plans and special-characteristic monitoring. |
| AIAG CQI-15 | The AIAG welding system assessment used to qualify resistance, arc and other joining processes across a supplier's plant. |
| ISO 3834-2 | Comprehensive welding quality-system requirements a fabricator adopts for arc-welded chassis and structural components outside the resistance-welding scope of the AIAG welding assessment. |
Monitoring pain points
| Pain point | Consequence | Signal that sees it |
|---|---|---|
| Electrode wear drifts a resistance spot welder's nugget quality across a shift | Nugget size and strength move outside the qualified window well before an operator notices anything visible. | Per-weld electrical and thermal signature trended against the qualified process window, not spot-checked. |
| Laser welds on battery tabs and busbars leave no visible sign of incomplete fusion | A joint that looks acceptable to the eye can carry a resistance or fatigue risk that only surfaces in service. | Keyhole and cooling-signature evidence captured on every weld at line rate. |
| Line rate makes manual sampling the only inspection most welds ever get | A drifting process is caught by statistical sampling well after a run of parts has already shipped. | Continuous per-weld classification that flags a drifting trend before it crosses into scrap. |
| Special-characteristic evidence is assembled from separate PLC, camera and MES logs after the fact | An IATF or CQI audit spends its time reconciling systems instead of reviewing evidence. | Weld identifier, station, timestamp and process record joined automatically into one exportable trail. |
What that means for the cell
- HeatCore AI Line-rate defect classification built for the volumes a body shop or battery line actually runs.
- HeatCam IR-S compact thermal camera Small enough to mount on a robotic welding gun or inside a tight battery-line cell.
- AI weld monitoring platform The route from per-weld signals to the special-characteristic evidence an automotive audit asks for.
Bring the evidence forward, not the inspection
Therness measures what happens while the arc is running — parameters, thermal signature, per-weld records — so the problems on this page surface on the shift that made them.
