1、 FORD LABORATORY TEST METHOD BI 171-01 Date Action Revisions Rev. 0 2017 05 03 Released N. Hortsch & A. Wedepohl (NA) Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 4 PAINT ADHESION TO BACKSIDE OF WELDS Application This procedure is used to measure the paint
2、adhesion at the backside of MIG/GMAW welds. Materials Required Adhesion Tape No. 898 (Minnesota, Mining and Manufacturing Co. - 3M) 24 mm wide. -or- An Equivalent 24 mm wide tape can be used if agreed upon by Ford Materials Engineering as long as the peel strength is greater than 0.6 N/mm per ASTM D
3、3330, Method A. The shelf life of these tapes is 12 months when stored in the original package in a dry, dark location. Procedure 1. Locate the backside side of a MIG weld. Weld Back side of Weld FORD LABORATORY TEST METHOD BI 171-01 Copyright 2017, Ford Global Technologies, LLC Page 2of 4 2. Apply
4、the tape by firmly pressing it onto the surface over the area containing the back side of the weld. Remove the tape within 90 +/- 30 seconds of application by pulling it off rapidly (not jerked) back upon itself at as close to an angle of 180 to the sample as possible. Evaluation 3. Report the perce
5、ntage of adhesion loss using the Adhesion Loss Table as a visual reference. Photo of paint adhesion loss on the back side of a weld Note: The reference images in the Adhesion Loss table are based on a 10 mm wide weld area (light grey lines) a weld length of 40 mm and a tape width of 24 mm. The perce
6、nt loss is calculated from the weld width and length and not the tape width and length. Adhesion Loss Table Classification Tape Appearance 0% loss FORD LABORATORY TEST METHOD BI 171-01 Copyright 2017, Ford Global Technologies, LLC Page 3of 4 Adhesion Loss Table Classification Tape Appearance 1% loss 2% loss 5% loss FORD LABORATORY TEST METHOD BI 171-01 Copyright 2017, Ford Global Technologies, LLC Page 4of 4 Adhesion Loss Table Classification Tape Appearance 10% loss 20% loss 50% loss
