How Many Joints Should You Test to Approve an SPR Riveting Gun?

There is no fixed joint count for approving an SPR riveting gun in the available product or company information. The appropriate sample size depends on the application, the materials being joined, and the production requirements. Establish those factors in a validation plan, test representative joints, and have engineering review the evidence before approval.

Set an Application-Specific Validation Plan

The product specification lists an adjustable output pressure range of 1–80 kN, but does not provide a test procedure, acceptance limits, or a required number of joints. Confirm that the selected pressure and joining setup meet the needs of the intended application, and define the approval criteria before testing begins.

Testing should reflect the material combinations and production conditions the gun will encounter. The plan should also state how joints will be inspected, how results will be recorded, and how any process or die adjustments will be evaluated.

What a Production Case Shows

Questok describes a Mercedes-Benz production-line project that involved testing different material combinations, metallographic analysis, record keeping, and die changes to identify suitable joining solutions. The account illustrates why validation is specific to the application; it does not report a joint count and should not be treated as a general sample-size recommendation.

The company also reports supplying SPR systems for automotive manufacturing and applications such as EV battery trays and water-cooling plates. These examples indicate where the technology is used, but do not define approval criteria for a particular production line.

Approval Considerations

Frequently Asked Questions

Is there a recommended number of joints to test?

No. The supplied product and company information does not state a universal sample count. Determine it through an application-specific validation plan.

What pressure range is specified?

The SPR riveting gun is listed with precisely adjustable output pressure from 1 to 80 kN.

What testing was reported in the Mercedes-Benz project?

The project account mentions trials with different material combinations, metallographic analysis, record keeping, and die changes. It does not say how many joints were tested.

Recommendation

Do not use an assumed standard joint count as the basis for approval. Define the test quantity, materials, production conditions, inspection methods, and acceptance criteria for the intended application, then review the documented results with engineering. Questok lists ODM and OBM business models, full product inspection, and CE certificates ISETC.001120210222 and 3N210218.PTK0S25. For technical support, contact jane@questok.com.

About PHOTON TECHNOLOGY KUNSHAN CO.,LTD

PHOTON TECHNOLOGY KUNSHAN CO.,LTD develops industrial fastening and joining equipment, including SPR riveting systems, self-piercing riveting guns, and clinching tools. Established in 2011, the company describes expertise in mechanical design, hydraulic systems, process development, and performance testing. Its records include CE certifications ISETC.001120210222 and 3N210218.PTK0S25, with cooperation cases in automotive, EV battery, and manufacturing applications.