Monday, 31 August 2020 16:28

Restore Crashworthiness with Corrosion Protection---Keys to a Safe and Proper Collision Repair

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Moving on to welding, Peirce said six different weld conditions are required just for the front stiffener, and this part cannot be removed and reinstalled because of the spot welding conditions.


“There are a number of manual weld settings that need to be adjusted to properly perform this repair," Peirce said. "You can’t just move forward with replacement using automatic settings on welders. You need to stop, identify the different weld settings and adjust to get the proper welds.”


After Peirce finished discussing weld-through primer recommendations, Algie shared information on several OEMs’ requirements related to bonding adhesive selection.


“You always need to refer to the OEM repair procedures because they’re constantly being changed and updated,” he stressed.


Bare metal seam sealers can help with corrosion protection and are designed for rapid production, but 3M recommends priming before seam sealing.


“The market demands it because it’s good for production and speed,” Peirce said. “Bare metal seam sealers can be acceptable, but you have to ensure that all bare metal is covered. Any seam sealer is only effective if it is coated properly, but bare metal sealers are especially vulnerable if the coatings are too thin or do not achieve full coverage.”


“Refinish technicians must be especially thorough while refinishing and be sure to paint from both directions to ensure full coverage of the ‘shadow side’ of the bead profile,” he added.

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