HVAC Duct Welding
HVAC Duct Welding
(OP)
My welders showed up on an industrial jobsite without any certified welders. I need to get these guys certs but I am more familiar with AWS D1.1 for structural welding and ASME 31.1/31.3 for pipe. They will be welding ductwork but more like HVAC ductwork - in fact, they will be using 6010 rods. Does anyone know what code I need to pull to test under? D1.1 seems not to fit, nor do the pipe codes. Thanks.





RE: HVAC Duct Welding
You might also find that E6010 electrodes are not the better electrodes for this application. Depending on the material and the thickness, it might be appropriate to go to another welding process such as GTAW or GMAW.
RE: HVAC Duct Welding
RE: HVAC Duct Welding
RE: HVAC Duct Welding
RE: HVAC Duct Welding
RE: HVAC Duct Welding
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Plymouth Tube
RE: HVAC Duct Welding
RE: HVAC Duct Welding
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RE: HVAC Duct Welding
And you are (probably) the first to have ever checked them on this this ... 8<)
What diameter rod are they trying to foist off? If they are attempting to weld HVAC-thick sheet metal with SMAW, it will have to be very, very small or they will burn through. Also: Stick welding is notoriously dirty and leaves a lot of grit, debris, and residue. Have they (the welders) committed to cleaning up and wire-brushing the interior AND exterior of the sheet metal before air flows through?
Have you inspected at the end of each shift the interior and exterior (before insulation goes on!) to make sure it really is welded up properly and cleaned?
RE: HVAC Duct Welding
Grease duct is heavy enough wall, to be stick welded with no problems.
Most HVAC duct unless it is an extremely large size is less than 16 ga wall, not condusive to stick welding unless you have a very steady hand and hours of experience. This is why most companies switched to mig or fluxcore.
If this is a trade union jobsite, I would suggest insisting on getting qualified welders from your SMWIA local, if non union then check with your local ABC center.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: HVAC Duct Welding
RE: HVAC Duct Welding
If you are using a Code, and following those rules, you will survive any audit, no matter how stringent. Tests are simple and can be performed on the jobsite with a saw and hammer.
RE: HVAC Duct Welding
Watch for holes in the duct and soldered areas with no penetration.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor