Volvo C30 2007 Service And Repair Manual page 92

Fig. 18: Identifying Proper Spot Welds On Both Panels
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NOTE: Use welding primer on all internal flanges.
Add filling primer if there is grinding damage.
CAUTION: Make sure that the spot welds take properly on both panels.
Fig. 19: Grinding Properly And Improperly
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Grind down the plug weld.
CAUTION: Only grind welds, not the adjacent panel.
2012 Volvo C30 T-5
ACCESSORIES AND BODY, CAB Body Frame - General Information