Can you help me, I have never seen this issue before?
From time to time, our members call the AGA with stories describing issues we have never heard of before. Often we are tasked to assist our members in finding a solution or speaking with industry experts to lend their opinion. In an effort to pass along what we learned from our members, I wanted to share the results from two recent investigations.
A galvanizer recently contacted the AGA regarding a skyscraper project in Manhattan, NY where a hot-dip galvanized coating inspection was performed above the 60th floor during ongoing construction. Upon climbing to the various floors requiring inspection, the galvanizer found all the digital coating thickness inspection gauges were completely unresponsive once at the elevated job site. To learn why this may occur on other jobs sites and how to avoid this issue in the future, see what the galvanizer and I learned upon contacting the gauge manufacturer:
Meanwhile, several galvanizers in the Pacific Northwest area of the United States contacted the AGA regarding a surface condition which presented itself as sharp, raised spikes after hot-dip galvanizing. This condition was unable to be identified prior to galvanizing, and was mostly found on hot-formed, semi-finished products, including flat bar, round/square stock, angle and channel. At first, we believed the condition to be a localized dross issue, but this proved an incorrect evaluation. An investigation revealed the presence of steel laps from steel manufacturing may be the root cause, but many attempts to identify and remedy the surface prior to galvanizing have been unsuccessful. As a result, discussions with steel manufacturers in the area are ongoing. For more information on this issue and what is being done about it:
© 2020 American Galvanizers Association. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use.