On Thursday, July 24, 2014 1:16:40 PM UTC-7, Clare wrote:
On Thu, 24 Jul 2014 10:34:48 -0700, wrote:



On Wed, 23 Jul 2014 21:40:07 -0400, wrote:



On Wed, 23 Jul 2014 20:18:48 -0500, "Terry Coombs"

wrote:



Meanie wrote:

I plan to have someone weld 4 sections of a layout using 6061 aluminum

which you can see

here.....https://www.flickr.com/photos/18223943@N06/14542109948/



This corner/section

https://www.flickr.com/photos/182239...n/photostream/

where the two pieces meet at the side, the corners touch. I cut the

other two corners for a flush cut.....

https://www.flickr.com/photos/182239...n/photostream/



Should I cut one side piece to make flush with the other for better

welding or will a good welder be able to fill that in for a secure

job?

Thanks



The first pair , you need to widen the vee a little , give the welder

somewhere to put some filler . The other pair should also touch at the

inside corner , and have about a 60� vee .

If tigging a "V" is not necessarilly required - Autogenous welding

doesn't even need filler (or much filler)

While autogenous welding works well with steel it does not work well

with 6061 aluminum. What happens is that the aluminum tends to hot

crack. This is why a filler metal is needed, the filler is a different

alloy and when mixed with the base metal forms an alloy that is not

sensitive to hot cracking.

Eric

But remember, not all aluminum is 6061, and not all 6061 is T6. And

not all aluminum is welded with a filler that is different in

composition from the base metal..

Welding 6061 structural parts is always second or third choice for me

- much rather use rivetted or bolted construction than welded where

strength is required.

I didn't look -was 6061 speced in the OP's post? If so, my bad.

You're a ****ing idiot, Clare.