Weld Stainless Steel Base Plate to Regular HSS section. 3

[dik]

A recent project has a SS base plate welded to an HSS column.
Can someone suggest a procedure and the type of welding to achieve that? or would regular SS welding procedures and electodes be adequate? The Hilti SS anchors will be covered with a SS cover; should the weld be passivated? Thanks in advance. Normal spec is:

-STAINLESS STEEL WELDING SHALL CONFORM TO ANSI/AWS D1.6-2017.
-WELDING ELECTRODES MAY BE 308L.


Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JStephen]

There are 309/309L rods that are used for SS to CS, but can't help with the details.
And I think that would likely be its own procedure, not just using a SS procedure.

 

[Ron]

Not a pre-qualified joint under AWS and likely not under CWB standards, so physical testing would be required.

 

[dik]

Thanks... I was hoping for something that had a prequalification to it.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[jayrod12]

Dik,

Metal-Tech Industries locally has done some SS to CS welding on projects in the past.

Unfortunately I don't have a contact there anymore, but maybe they'd be able to give you a hand.

 

[dik]

Thanks, everyone. I'll let you know the outcome.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

JStephan: Bang on... thanks

Found this one... and CWB app'd... now to get some design values for it.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[kingnero]

Perhaps a bit late to the party, but I do have some questions about that procedure...
I would requalify with the (experienced) welder's parameters as these don't sound like good practice to me.
I only use this wire diameter for up to 0.125 " plate thickness, and go up for thicker plates,
and I'd prefer to weld 5 mm plates (.187") at 220 amps (12 m wire feed on a 1 mm wire), quite a bit faster than given.
The parameters for >= .375" are criminal.

Yes, one of the 309 (L/LSi/LMo) varieties should be used.

 

[dik]

Thanks king... never late... it just adds to my inventory. I'm not sure what the welder's parameters are; can you elaborate?

The plate (actually BAR) is thin. The engineer spec'd 1/4", but I'm pretty sure it has to be 3/8. I don't know why the baseplates are SS. They are part of a handrail system that is HDG... does't make sense. The baseplates are 4x4 with four 3/8" Hilti anchors spec'd with 3" embedment... my Profis calcs indicate 5" embed due to closeness (2-1/2" apart) with the 3' handrail moment.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[kingnero]

3/8 bar will require a lot of dexterity from the welder. Difficult, but doable. I recently did something similar, but all connections were at 32° (baseplate went flat on the beam that supports the stair, the bars were vertical stringers from the railing).

You'll want a 1 mm wire at the high end of short circuiting transfer, meaning around 10-11 m/min wire feed (aim for 200 - 220 amps) and 20-21 Volt. And a damn good welder.
309 wire and 98/2 gas are correct. Don't worry about travel speed, the welder has to focus on keeping the torch radial to the center of the bar. You cannot measure travel speed.
Don't be too stringent on visual inspection, Near to impossible to achieve top notch quality AND visual appearance. I'd focus on penetration rather than visual.
FYI, we've trained the welders on 1 1/2" tubes (~ 5 mm wall thickness, so you cannot burn holes in them), and gradually going smaller in diameter.

 

[dik]

king... I should have been more informative in my original question. I'm not sure you understand the connection. It's an SS BAR 3/8x4x4 welded to an HSS 1-1/2x1-1/2 as a small baseplate... with a fillet weld all around small pieces. It's a small baseplate on a post. I'm not sure where the dexterity is involved. It's a shop fabrication. Does that change any of your reply?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[kingnero]

I'm sorry, I misread it as 3/8 round bar welded to a baseplate. I shouldn't have replied without confirming this, however I had a similar work in my head that automatically took over ...

Please ignore my entire last reply, as it isn't applicable then. For these welds, I'd try spray arc as it'll give much better penetration and a nice and flat appearance. Wire and gas as mentioned before.

 

[dik]

Thank you so much... I owe you a beer.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[gtaw]

I would opt for SMAW using E309-16 or E309-17. The welds are relatively short and can most likely be deposited as single pass welds. Hardly worth the time to setup using GMAW or FCAW. How many base plate need to be welded? You'll be paying for a full spool of filler metal if you go with GMAW or FCAW.

The procedure will not be prequalified per AWS D1.1 or D1.6 if they are the governing standards because of the dissimilar base metal combination.

Be advised that the E309-17 typically produces a nice looking concave fillet weld, but often doesn't get fusion to the root. E309-15 will get the fusion to the root, but produces a very convex weld, not as pleasing to the eye as E309-17. E309-16 will be easier to get fusion to the root than E309-17, and not as much convexity as E309-15.

The electrode diameter is dependent on the wall thickness of the HSS and the size of the fillet welds required. The recommended amperage range for each electrode diameter is usually listed on the manufacturer's website. You can confirm the useful amperage range when you qualify the WPS.

Best regards - Al

 

[dik]

Thanks gtaw:

Is there a common procedure for using E309-16, or one of the other sticks?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik