TechnicianVision · Knowledge base
Weld-Through Primer Guidelines: FCA/Stellantis - UPDATE
I-CAR · January 22, 2025 · Alfa Romeo, Chrysler, Dodge, Fiat, Jeep, RAM, Stellantis
Summary
FCA/Stellantis requires the use of zinc-based weld-through primer on all mating surfaces for squeeze-type resistance spot welding (STRSW) and internal flange surfaces for GMA welding on 2011 and newer models. However, weld-through primer must not be used on mating surfaces where weld bonding (STRSW combined with adhesives) is performed, and it must be completely removed from the direct weld zone prior to GMA welding to prevent porosity.
What to do on the job
Apply zinc-based weld-through primer to mating surfaces for STRSW and GMA welding, but completely remove it from the direct weld zone before GMA welding, and never use it on weld-bonding joints.
How to use it
Use this document to justify the labor and materials for applying zinc-based weld-through primer (specifically recommending 3M 05917 Weld Thru II) on FCA/Stellantis vehicles 2011 and newer. It also serves as documentation for the necessary labor time to prep and clean/remove the primer from the direct weld zone prior to GMA welding to ensure weld quality, and explains why weld-through primer is omitted on weld-bonded joints.
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