Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
(OP)
Hi all,
I am looking to determine the maximum tensile force I can put on a pipe that has a welded flange. The pipe is 7.5" OD, 3/8 Wall thickness and the flange is 1" thick with its ID matching the pipes OD and an OD of 12".
I have called out a full penetration weld that will require grooving on top for a flat surface and fillet weld on bottom with the filler material being 4943 whose yield strength will come back to 31 ksi after artificial aging.
The surface area of contact is 23.68 IN^2.
Can I simply multiply its surface area by its shear strength to determine the force required to fail?
Thanks,
Mario
I am looking to determine the maximum tensile force I can put on a pipe that has a welded flange. The pipe is 7.5" OD, 3/8 Wall thickness and the flange is 1" thick with its ID matching the pipes OD and an OD of 12".
I have called out a full penetration weld that will require grooving on top for a flat surface and fillet weld on bottom with the filler material being 4943 whose yield strength will come back to 31 ksi after artificial aging.
The surface area of contact is 23.68 IN^2.
Can I simply multiply its surface area by its shear strength to determine the force required to fail?
Thanks,
Mario





RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
7.5" OD pipe? Could this be tubing? There is no pipe rated at 7.5" OD, or that actually is 7.5" OD.
What BUGGAR is telling you is that aluminium 6061-T6 is heat treated. The material in the vicinity of your weld is the much weaker aluminium 6061-0.
--
JHG
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Base Metal
Rn=FnBM*ABM
Rn = Nominal Strength
Weld Metal
Rn = Fnw*Awe
Since the this load case is in Shear both equations end up being having the same variables
FnBM= 0.6*Ftuw
ABM = Sw*Lwe
Ftuw = 24 KSI as defined by the manual
Sw = .375 as the thickness of the minimum part as a full penetration groove weld
Lwe = Effective length -> Weld parallel to shear -> perimeter = 2*Pi*r
ABM = 8.835 IN^2
FnBM = 14.4 KSI
Rn = 127,224 lbs
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Yes it is tubing.
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Do you need to artificially age the material? When we weld structural aluminum structures, we design around the as-welded strength with no post treatment. How do you artificially age your parts?
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
The only bending that will occur is due to the bolt heads being an 1.5 inches away from the weld but the bolted connection should be stiff enough that it will act very much in tension.
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
That depends on the bolt pattern doesn't it? For your assumption to be true, the bolts should be closely spaced... ...more than 12 bolts required.
STF
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Is that loading steady state/static? Or is there some variation that will make fatigue resistance important?
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
Is that loading steady state/static? Or is there some variation that will make fatigue resistance important?
ESAB offers some suggestions when welding 6061
http://www.esabna.com/us/en/education/blog/how-to-...
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
By the time you apply a knockdown factor for the weld joint and allow for fatigue life, the max tensile stress you should have is probably less than 20ksi.
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
on the degree of microstructural transformations that occur in the HAZ.
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection
RE: Weld Strength of Aluminum 6061-T6 - Flange to Pipe Connection