Post weld heat treatment

[greencircle]

Hello guys,
I am looking for post weld heat treatment process for Alum 6061 T6 aluminum weldment. I am talking about sizes of street light poles.

[ul]
[li]Procedure[/li]
[li]Temperature requirements[/li]
[li]Holding temperature[/li]
[li]Equipement needed[/li]
[li]Any quenching?[/li]
[li][/li]
[/ul]

I am intending to bring the temper in the HAZ zone back to T6 after this heat treatment.

Any input is appreciated.

 

[weldstan]

Is the welding filler metal capable of achieving the strength of the 6061-T6?

 

[greencircle]

I am not sure about this. But I know we use 4043.

 

[weldstan]

4043 is not capable of meeting 6061-T6. So give up the idea of PWHT. You will simply need to size the materials/weld thickness to reflect the lower strength welds.

 

[greencircle]

Thanks for your comments. I did read a little about this.

http://www.esab.ca/ca/en/education/...suitable-filler-alloy-for-welding-6061-t6.cfm

In the above link from ESAB it states that we need to use filler 4643 in case we are performing PWHT.
Now, I don't know what other changes should be involved in terms of welding equipment etc.
Also, this link says base material as ALUM 6061 T6, but in my case I am welding 6061 T6 extrusion to ALUM 356 casting. Not sure my case is different from what ESAB saying. I will also email their technical support & see what they have to say.

Further coming back to my original question, I believe (I could be wrong) that there is no liquid quenching involved in this PWHT. Just air cooling after 6hrs of holding at 360 deg F is sufficient. Any one know more information about this. or any study material/ resource would be appreciated.

Thanks