Similar to any manufacturing process,hot-dip galvanized steelrequires an inspection of the finished product to ensure compliance with applicable specifications. The inspection process requires a clear understanding ofgalvanizing specificationrequirements and measurement techniques to make an accurate assessment.
Inspection of hot-dip galvanized steel is fairly simple, as any uncoated areas are easily identifiable. The requirements for hot-dip galvanized coatings are found in three ASTM specificationsA123,A153, andA767. Differences in appearance, as well as surface imperfections, can occur, however, in most instances, this is not cause for rejection of the material and does not affect the long-term protection. Inspection is most effectively and efficiently conducted at the galvanizing facility where questions can be asked and answered quickly.
AGA Inspection of Galvanized Steel App
The AGA has created a comprehensive app to aid in the inspection of hot-dip galvanized steel. The app is a visual guide to identifying various surface conditions present after hot-dip galvanizing. Each image in the app is accompanied by text identifying the industry term for the surface appearance and detailing how and why it occurs, and whether or not it is accepted according to the specification. In addition to the visual interpretation of surface conditions, the app also contains critical specification (ASTM, ISO, AASHTO) information to assess compliance with coating thickness requirements as well as how to conduct repairs.
The AGA has created an inspection course that course is intended to train individuals on the proper inspection techniques and requirements for hot-dip galvanized steel products. There are four sections in this course:
Hot-Dip Galvanizing Process
Types of Inspection
Upon completion of this course, you should be able to recognize specification requirements and perform all inspection steps to ensure conformance with the requirements. Additionally, any inspector who completes the course, and passes the test (80% or better) will receive a printable Certificate of Completion and will be listed on the AGA website as an inspector.Take the online Inspection Course.