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Weld-through primers are generally a zinc-based product that are applied to the mating surfaces prior to welding. Corroding zinc forms zinc oxide which protects the steel. This is called sacrificial corrosion. For a quality weld to be made it’s required that the weld-through primer be removed from the direct weld zone before welding the joint when GMA welding. Many OEMs have a position on when and how to use weld-through primer or when it shouldn’t be utilized. Let’s see what Porsche recommends and where this information can be found.
This information, along with other part preparation guidelines, can be found in the vehicle specific body repair manual. Porsche:
- says to always apply welding primer to both sides of the welding flange when resistance spot welding.
- does not specify a specific brand of weld-through primer.
Also, note that weld-through primer should not be used on aluminum.
Use the vehicle-specific body repair manuals to determine which type of welding is required for the repair you are performing. Failure to follow OEM procedures will sacrifice the safety and quality of the repair.
For additional links to Porsche, check out the Porsche OEM Page.
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Article validated in 2022