Stud welding on galvanized member
Stud welding on galvanized member
(OP)
We want to weld studs to a hot-dip galvanized platform frame for grating clips but I've read that you should not stud weld directly to galvanized steel. This leaves two options.
1) Stud weld before galvanizing. The fabricator is saying the studs will get knocked off during hot-dip galvanizing. This seems like utter nonsense to me. Just be careful. Am I making it easier than it really is? Does he have a valid point? I can see them getting damaged during shipping but again, just be more careful.
2) After galvanizing grind the spot where the stud goes, weld it on, then touch up affected area. I've never heard such b'ing & m'ing when this option was presented to the shop guys.
The obvious answer is don't stud weld, use some other method for attaching grating. The problem is our client has only given us two choices. Stud weld or use Hilti stainless steel disk. These babies along with the powder-actuated fastener are $20 apiece! Don't even get me going on, "How could they possibly cost that much?" Anyway, anybody have any experience with a solution to problem?
1) Stud weld before galvanizing. The fabricator is saying the studs will get knocked off during hot-dip galvanizing. This seems like utter nonsense to me. Just be careful. Am I making it easier than it really is? Does he have a valid point? I can see them getting damaged during shipping but again, just be more careful.
2) After galvanizing grind the spot where the stud goes, weld it on, then touch up affected area. I've never heard such b'ing & m'ing when this option was presented to the shop guys.
The obvious answer is don't stud weld, use some other method for attaching grating. The problem is our client has only given us two choices. Stud weld or use Hilti stainless steel disk. These babies along with the powder-actuated fastener are $20 apiece! Don't even get me going on, "How could they possibly cost that much?" Anyway, anybody have any experience with a solution to problem?





RE: Stud welding on galvanized member
RE: Stud welding on galvanized member
RE: Stud welding on galvanized member
RE: Stud welding on galvanized member
RE: Stud welding on galvanized member
Do you need structural connections?
if so, you're 2 approaches are all you have.... unless...
the contractor has a WPS for burning through HDG to make this weld, PQR test records for that burn-through WPS, and WPQR's welder certs and test records for each welder to make those field connections.... i bet against the house that the Contractor does NOT and i win every time. i'm assuming you've specified AWS welds, which the galvanized coatings kill all the Pre-Qualified Welds available, as it is an essential variable.
The Hilti system will give you lots of headaches if you have to shoot into or near the web, or if you have steel shapes of varying thickness to punch into. i fail about 3% of them. But, you could meet halfway and say.... Shoot them, and the one's you mess up (or don't work here), clean the metal and weld.
RE: Stud welding on galvanized member
If the tape is not applied tightly to the substrate, the caustic dip, HCl dip, or the flux dip will get between the tape and substrate and it will fall off before it reaches the kettle. It sounds silly but this work is for a power plant so we have taken it very seriously. Zinc in a stainless weld causes cracking which causes companies to go out of business.
Maskote may work for your application but it was too messy and time consuming for us.
RE: Stud welding on galvanized member
RE: Stud welding on galvanized member