Spec for Mast and spreaders

[michihito]

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

[alex]

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.

[michihito]

Thanks. This helps me a lot!

[harald]

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/

[alex]

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

[Panu]

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...

[Panu]

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...

[Panu]

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...

[Cage]

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.