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Steel Spot And Plug Weld Nugget Size: Mercedes-Benz - UPDATE
I-CAR · May 26, 2021 · Mercedes-Benz
Summary
This article outlines Mercedes-Benz's specific guidelines for spot and plug welding, noting that while they do not specify exact nugget sizes, they require pre-repair welding tests, 20 mm spot weld spacing, and 5.5 mm holes for plug welds. It also mandates that squeeze-type resistance spot welds (STRSW) must be placed on original spot weld locations when dealing with multi-layer sheet metal and hardened adhesive.
What to do on the job
Perform destructive welding tests before beginning repairs, space spot welds approximately 20 mm apart, and use 5.5 mm holes for plug welds as specified by Mercedes-Benz guidelines.
How to use it
Use this document to justify the labor time required for performing mandatory pre-repair destructive weld testing and to defend the specific 5.5 mm hole preparation required for plug welding on Mercedes-Benz vehicles.
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