How to Determine the Right Joint Test Plan for an SPR Riveting Gun

There is no universal number of joints that must be tested before an SPR riveting gun can be approved. The appropriate quantity depends on the materials, joint design, production conditions, and quality requirements of the intended application. Approval should therefore follow a documented, application-specific validation plan rather than an assumed sample count.

Key Points for SPR Riveting Gun Approval

• The supplied product and company information does not specify a standard number of joints for approval testing.
• Define the test quantity according to the material stack-up, joining process, production volume, and customer requirements.
• Use representative joints and evaluate the results against agreed technical and quality criteria.
• Questok describes extensive material-combination testing and metallographic inspection for a demanding automotive project, but does not disclose a universal number of test joints.
• SPR equipment is identified for automotive manufacturing, EV battery trays, and water-cooling plate applications.

How to Build an Application-Specific Validation Plan

Before approving the equipment, confirm that the SPR riveting gun and its tooling can consistently produce acceptable joints under the intended operating conditions. The supplied product data lists an adjustable output pressure range of 1–80 kN. However, it does not provide a prescribed test sequence, acceptance limit, or minimum joint sample size.

Important Validation Factors

The test plan should reflect the actual production setup. Consider the materials and thicknesses being joined, rivet specifications, die selection, pressure settings, joint geometry, and expected production cycle. Testing should include representative combinations rather than relying on results from an unrelated application.

Inspection methods may include visual examination, dimensional checks, cross-sections, pull-out or destructive testing, and metallographic analysis where appropriate. Record the equipment settings, tooling configuration, material combination, test results, and any corrective changes so engineering can make a traceable approval decision.

Evidence from Questok’s Production Experience

In a Mercedes-Benz production-line project, Questok reports testing multiple material combinations, carrying out metallographic analysis, maintaining records, and changing dies to identify suitable joining solutions. This example supports a structured and iterative validation process, but it should not be interpreted as a recommended universal sample count.

The company also reports supplying self-piercing riveting systems for automotive production as well as EV battery trays and water-cooling plates. These applications can involve different materials, thickness ranges, joint requirements, and quality standards, which is why the validation scope must be tailored to each project.

Validation Information at a Glance

Frequently Asked Questions

Conclusion and Practical Recommendation

Do not approve an SPR riveting gun by applying an assumed industry-wide joint count. Instead, create a validation plan that reflects the intended materials, rivets, tooling, pressure settings, production conditions, and quality requirements. Test representative joints, document all settings and findings, and obtain engineering approval against predefined acceptance criteria.

Questok lists ODM and OBM capabilities, full product inspection, and CE certifications ISETC.001120210222 and 3N210218.PTK0S25. For technical support, contact jane@questok.com.

About Us

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 engineering capabilities spanning mechanical design, hydraulic systems, process development, and performance testing. Its records include CE certifications ISETC.001120210222 and 3N210218.PTK0S25, and cooperation cases across automotive, EV battery, and manufacturing applications.