Welding 2xxx aluminum to 6xxx aluminum

Date 01-05-2011 16:08

Is there a good source of information on the net regarding welding dissimilar aluminum alloys? We are welding a 2000 series aluminum alloy to 6061 and it doesn't seem as though there is much data out there regarding resulting weldability or metallurgy when welding dissimilar aluminum alloys. Any suggestions?

Thanks

By Lawrence (*****)

Date 01-05-2011 18:40

Zeek.

Alot depends on joining process and service conditions..

2XXX series alloys are commonly joined by resistance spot welding, but only a few 2XXX alloys are considered weldable by arc processes. 2014, 2219, and 2519 are the three arc-weldable alloys mentioned by the Aluminum Association in its "Welding Aluminum Theory and Practice". No 2XXX alloys are considered suitable for brazing.

Say more about the specific 2XXX series alloy you have selected, and maybe about process and service conditions too.

By Zeek

Date 01-05-2011 19:22

We are using an automatic TIG process to weld 2219-T87 to 6061-T6. Our filler wire of choice is 4043. I don't know the exact service conditions yet, but i'll post them up this afternoon.

By Zeek

Date 01-06-2011 00:32

The service conditions are pretty mild... The temperature of the part ranges from 40F to 90F max and the structure operates at 14.7psi, but is proof tested to 23.

By Tommyjoking (****)

Date 01-06-2011 02:01

I do not think you will have any problems with your choices.

By Zeek

Date 01-06-2011 18:56

We haven't been having any problems in regards to tensile testing because we are meeting our strength requirements. But, I don't know much in terms of the metallurgy or resulting material matrix that we are creating by welding these 2 alloys together in this manner. My concern is things like fatigue, corrosion properties, etc.