GMNA GM4488M PDF

This specification provides acceptance criteria for resistance spot welds in automotive products for which GM is responsible for establishing or approving product design.

The application of the requirements of this specification is mandatory, unless a specific note on the weld drawing establishes different weld criteria. Any exception from the requirements of GM4488M must be made in accordance with good engineering practice.

Welded structures are considered satisfactory when they carry the intended service loads for a required period. Service loads on weldments in a vehicle are varied in both type and magnitude and cannot be addressed by this specification; therefore, while weld quality criteria of this specification are consistent with service loading requirements, they have been established specifically for use in process and product monitoring. Any attempted application of this document to other uses, such as post-crash weld quality assessment, may lead to an erroneous result or conclusion.

Spot welds are considered discrepant when they do not meet the criteria of this specification. Discrepant spot welds by retaining a portion of their engineering properties may still contribute to the integrity of the assembly.

The welding source is responsible for establishing practices and test methods to assure that the criteria of this specification are met, and are consistent with GM9621P Welding Process Control Procedure.

For clarification of this specification or editorial comments, email the Weld Council at [email protected].