On Fri, 17 Jul 2015 18:58:16 -0500, Boating All Out
wrote:

Aluminum welded products will fail at the weld under stress. Welded
aluminum is about 50% weaker than unwelded aluminum. Skill has a lot to
do with it and my info is from a highly skilled welder specializing in
aluminum.

This is commonly handled by designing a heavier weld structure, so it
can't be seen as a disadvantage - unless you just don't like aluminum.
http://www.kastenmarine.com/alumVSsteel.htm

===

Nice analysis of the design trade offs, thanks. The biggest knock on
aluminum in my opinion is susceptibility to corrosion. It can be
managed but it takes vigilance regarding electrical faults, repairs
and debris in the bilge.

wrote:
On Sat, 18 Jul 2015 00:50:28 -0400, Wayne.B
wrote:

On Fri, 17 Jul 2015 18:58:16 -0500, Boating All Out
wrote:

Aluminum welded products will fail at the weld under stress. Welded
aluminum is about 50% weaker than unwelded aluminum. Skill has a lot to
do with it and my info is from a highly skilled welder specializing in
aluminum.

This is commonly handled by designing a heavier weld structure, so it
can't be seen as a disadvantage - unless you just don't like aluminum.
http://www.kastenmarine.com/alumVSsteel.htm

===

Nice analysis of the design trade offs, thanks. The biggest knock on
aluminum in my opinion is susceptibility to corrosion. It can be
managed but it takes vigilance regarding electrical faults, repairs
and debris in the bilge.

I have a 40 year old aluminum boat that lived pretty much all of it's
life in salt water and it is doing OK. It is welded together

Part depends on the alloy. Either 50xx or 60xx for salt. Minimal copper in
the alloy. 60xx is hard to work.

wrote:
On Sat, 18 Jul 2015 02:37:40 -0500, Califbill billnews wrote:

wrote:
On Sat, 18 Jul 2015 00:50:28 -0400, Wayne.B
wrote:

On Fri, 17 Jul 2015 18:58:16 -0500, Boating All Out
wrote:

Aluminum welded products will fail at the weld under stress. Welded
aluminum is about 50% weaker than unwelded aluminum. Skill has a lot to
do with it and my info is from a highly skilled welder specializing in
aluminum.

This is commonly handled by designing a heavier weld structure, so it
can't be seen as a disadvantage - unless you just don't like aluminum.
http://www.kastenmarine.com/alumVSsteel.htm

===

Nice analysis of the design trade offs, thanks. The biggest knock on
aluminum in my opinion is susceptibility to corrosion. It can be
managed but it takes vigilance regarding electrical faults, repairs
and debris in the bilge.

I have a 40 year old aluminum boat that lived pretty much all of it's
life in salt water and it is doing OK. It is welded together

Part depends on the alloy. Either 50xx or 60xx for salt. Minimal copper in
the alloy. 60xx is hard to work.

Dunno but the TIG guy I have used seemed to be doing OK with it.

The 60xx welds fine. Is hard to form. So your toon's are probably 50xx.
Same as my boat. The jet boats will normally only use 60xx in bottoms.
Not much bending, and tougher to dent.

On Sat, 18 Jul 2015 13:35:43 -0500, Califbill billnews wrote:

wrote:
On Sat, 18 Jul 2015 02:37:40 -0500, Califbill billnews wrote:

wrote:
On Sat, 18 Jul 2015 00:50:28 -0400, Wayne.B
wrote:

On Fri, 17 Jul 2015 18:58:16 -0500, Boating All Out
wrote:

Aluminum welded products will fail at the weld under stress. Welded
aluminum is about 50% weaker than unwelded aluminum. Skill has a lot to
do with it and my info is from a highly skilled welder specializing in
aluminum.

This is commonly handled by designing a heavier weld structure, so it
can't be seen as a disadvantage - unless you just don't like aluminum.
http://www.kastenmarine.com/alumVSsteel.htm

===

Nice analysis of the design trade offs, thanks. The biggest knock on
aluminum in my opinion is susceptibility to corrosion. It can be
managed but it takes vigilance regarding electrical faults, repairs
and debris in the bilge.

I have a 40 year old aluminum boat that lived pretty much all of it's
life in salt water and it is doing OK. It is welded together

Part depends on the alloy. Either 50xx or 60xx for salt. Minimal copper in
the alloy. 60xx is hard to work.

Dunno but the TIG guy I have used seemed to be doing OK with it.

The 60xx welds fine. Is hard to form. So your toon's are probably 50xx.
Same as my boat. The jet boats will normally only use 60xx in bottoms.
Not much bending, and tougher to dent.

===

Don't have welding equipment but I have done some cold bending on
3/16ths 6061 up to about 45 degrees. The slightest imperfection near
the bend line results in a stress crack. It's very strong however.