3100122

NUMBER:
GROUP:
DATE:
31-001-22
31 - Collision Bulletins
August 19, 2022
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.
SUBJECT:
Approved Use of Weld Through Primers
OVERVIEW:
This bulletin documents the FCA US LLC position regarding the use of weld through primer when
using Squeeze Type Resistance Spot Welding (STRSW) and Gas Metal Arc Welding (GMAW)
processes when welding steel body panels and structural components.
MODELS:
2011 - Current
(ALL)
All FCA Group Vehicles
NOTE: This bulletin applies to vehicles within the following markets/countries: North
America, LATAM, APAC and EMEA.
DISCUSSION:
Corrosion protection must be restored during a repair anytime the protective coatings have been
compromised. All areas that have been subjected to structural pulls, clamping, straightening,
welding, or other repair operations that caused damage to the corrosion protection system need to
be assessed for reapplication.
The use of Weld Through primer is recommended when corrosion protection such as zinc coatings
and e-coat are removed prior to STRSW and MIG/MAG (GMAW) welding processes. Weld
through primer is used in between welded steel panels such as flanges to protect them against
corrosion before they are welded together.
NOTE:
• Can only be used on ferrous metal components.
• FCA recommends the use of weld-through primer for all mating surfaces when using
(STRSW) squeeze type resistance spot welding.
• FCA recommends the use of weld-through primer on all internal flange surfaces / mating
surfaces when using GMA Welding processes.
• FCA requires the removal of all zinc weld-through primer completely from the weld zone
before the welding process to reduce the possibility of porosity in the weld.
• Weld-through primer is not to be used on mating surfaces where the combination of
STRSW and adhesives (Weld Bonding) are being performed.
• Weld through primer must be zinc based.
31-001-22
-2-
NOTE: The use of cavity wax is recommended after the welding process. Cavity wax works
well in boxed areas such as frame rails and will “creep” into small cracks and
crevasses to reduce the chance of corrosion taking place. Cavity wax offers extra
protection when used with a weld through primer in and around the weld zone.
Please refer to the “Corrosion Protection Restoration” document located in Service
Library under “Collision Information - Standard Procedures” for additional
information.
REFERENCE WEBSITE
• Additional information can be obtained at https://www.moparrepairconnect.com .
POLICY:
Information Only