Welding on Galvanized metal Test Data??

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Cumminsguy71

Date

05-28- 18:38

05-28- 18:38

Ok, I have a question, quarry.

I want to know if anybody has seen any data, testing done on galvanized metal. Here is what I am looking at. I know some "welders" think and do the old "use a and burn it out" trick then run a over the . Maybe they wire wheel the or maybe they just use the chipping hammer and a wire brush if we are lucky. I prefer the grind the galvanizing off of the weld, especially when the engineer and owner of the structure specifically mentions doing so. For two reasons, (A) Galvanized coating looks an awful lot like contamination to me and (B) I absolutely hate getting the skin seared off my legs and arms when these molten blobs drip onto me.

The data I am looking for, most likely not anything out there tested like this because the lab guy I deal with all the time said, "all of the tests we have done have been ground properly and galvanized removed".

So, in a non perfect world I am wondering if there is any test data where somebody said, "I wonder what the micro structure looks like? I wonder what the tensile tests and x-rays would reveal?". I am surely not the first guy to ponder this question and I am almost positive that somebody somewhere has done tests to prove that welding directly over galvanized steel is....bad mojo.

If I have a few thousand dollars laying around or my own personal lab I would like to run some tests. Three sets of test plates, all galvanized and beveled as per AWS D1.1. First test plate would be run properly, , uphill, galvanized coating removed, backing strip. Second set, galvanized coating in place and run a uphill over the galvanized, backing strip. Third test plate, downhill(or as it seems some prefer, can you say Farm Code? Has our Farm Code been published yet???), remove the slag with a wire wheel, ideally or with a wire brush the fill the remaining with uphill. For the last two tests to be accurate the backing strips would also have to be galvanized to accurately portray real world situations.

I guess my question to the American Welding Society would be, do you have some free time to run some tests? I would like to see results of something like this so show "weldors" that they are in fact weakening the weld? Am I correct in presuming this? I see galvanizing as contamination, molten metal from two members with the filler rod and now add in molten zinc? Will the molten zinc boil off? It appears to me that when I have done it on one particular job several years ago that it mixes with the filler metal and base metal causing a silvery weld bead. Is there porosity in the weld? Underneath the very code worthy visual? Other than the fact that you can definitely see the silver from where it was obviously welded over galvanized? X-rays, tensile tests, images of the micro structure compared to a properly welded plate with galvanizing removed?

Maybe its not hypercritical as some would be lead to believe or in their infinite metallurgical experience(being a smart azz) they know better because "Daddy did it all the time on the farm".

Now, I guess I am looking for well educated replies, information to back up said replies not some "it'll be alright" type of dribble.

Thanks to all and if there is no data, AWS? Would you mind doing an article on this in the journal?

Shawn

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