• Spec for Mast and spreaders

Posted: **Sun Oct 23, 2022 21:28 pm**

Hello.

I found a spreader on starboard side has a crack. See attached photos. I would like to order new one but I don't know which company produced this one. Does anyone has any idea which product it is?

http://michihito.com/file/fe83_spreader ... ard_1.jpeg
http://michihito.com/file/fe83_spreader ... ard_2.jpeg

Posted: **Sun Oct 23, 2022 22:06 pm**

If the boat is a Finn Express 83 - that rig is from Selden. There are detailed Selden catalogs, you should be able to find the spreaders by dimensions.

One FE83 has replaced her mast just recently - they might have spare spreaders, too. Another option is to weld the cracks.

Posted: **Mon Oct 24, 2022 09:38 am**

Thanks. This helps me a lot!

Posted: **Mon Oct 24, 2022 09:57 am**

I wouldn't trust old aluminium with a new weld on it. It's quite hard to get the heat treating right afterwards to avoid local tempering of the material. You might lose 50% of the strength if just welding.

https://makeitfrommetal.com/does-weldin ... weaken-it/

Posted: **Wed Oct 26, 2022 09:42 am**

It is true, old aluminium doesn't weld well.

Posted: **Wed Oct 26, 2022 20:30 pm**

alex wrote: ↑Wed Oct 26, 2022 09:42 am It is true, old aluminium doesn't weld well.

Actually it welds well but the microstructure must be harmoniced first by anealing the work piece and then to do precipitaion hardening again. The fact that it is not normal that workshop has a heat trestment furnace, makes the end result questinable...

For this reason it makes sense that aluminium railroad carts are being welded by stir welding witch is kind of friction welding method without HAZ (Heat Affected Zone) problems in the material. Because of that heat treatment afterward is not required. I can't imaging the furnace big enough to fit in a railroad cart...

Posted: **Wed Oct 26, 2022 20:31 pm**

Panu wrote: ↑Wed Oct 26, 2022 20:30 pm
alex wrote: ↑Wed Oct 26, 2022 09:42 am It is true, old aluminium doesn't weld well.
Actually it welds well but the microstructure must be harmoniced first by anealing the work piece and then to do precipitation hardening again. The fact that it is not normal that workshop has a heat trestment furnace, makes the end result questinable...

For this reason it makes sense that aluminium railroad carts are being welded by stir welding witch is kind of friction welding method without HAZ (Heat Affected Zone) problems in the material. Because of that heat treatment afterward is not required. I can't imaging the furnace big enough to fit in a railroad cart...

Posted: **Wed Oct 26, 2022 20:31 pm**

Panu wrote: ↑Wed Oct 26, 2022 20:31 pm
Panu wrote: ↑Wed Oct 26, 2022 20:30 pm
alex wrote: ↑Wed Oct 26, 2022 09:42 am It is true, old aluminium doesn't weld well.
Actually it welds well but the microstructure must be harmoniced first by anealing the work piece and then to do precipitation hardening again. The fact that it is not normal that workshop has a heat trestment furnace, makes the end result questionable...

For this reason it makes sense that aluminium railroad carts are being welded by stir welding witch is kind of friction welding method without HAZ (Heat Affected Zone) problems in the material. Because of that heat treatment afterward is not required. I can't imaging the furnace big enough to fit in a railroad cart...

Posted: **Thu Oct 27, 2022 19:21 pm**

Some maybe 5-6 years ago I got a quote from Rig-Man (rig-man.fi) gave me an offer for new ones, so even if the mast is old and not produced anymore, seems like it would be able to get at least spreaders for it still.

Spec for Mast and spreaders

Spec for Mast and spreaders

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