Question About Welds On Ali Cooler Piping

[VB-]

hey guys, just wondering, seen heaps of custom cooler piping, mostly on jap cars, that seems to have a weld not running around the pipe, but sort of along it on the bends. as i understand it mandrel bending with a machine isnt real common practice in japan, so they do it in other ways, is this something to do with it?

*as luck would have it i cant find many pics, something like this though:

see the seam running along the radius?

[QWK32]

as i underdstand it, you buy the donuts in halves, cut them to the angle you want, and weld two halves together to get get a pipe.

[VB-]

it makes sense but i cant see why? are half circle donuts alot cheaper? whats a full donut worth compared to two half donuts?

[ACTIV32]

im sure you cant buy a hole donut hence the two half make the hole i just bought 2 halves $26 not pricey at all

[VB-]

oh ok, i thought u could

[Mr Jollwah]

I've seen welded halve donuts maybe thats what they are

[FelixTRX]

Donuts are two pressed (or spun) halfs that have to be welded together into a full ring, before you cut them at the angle you need. Aluminium is a soft metal that crushes easily unless it is handled correctly when bending.

Cheers, Greg.

[Craved]

half donuts are spun - allows pipe out of flat sheet alloy, and the possibility of 180 degrees in different radius - cheapest option as for $25 ish you get 4 x 90 bends

[Adriano]

half donuts are spun - allows pipe out of flat sheet alloy, and the possibility of 180 degrees in different radius - cheapest option as for $25 ish you get 4 x 90 bends

Where do you get them for that price? Last time i checked JNT were a bit more (about $25 per half)

[Craved]

i get it at trade through a mates sheetmetal place - but it does depend on the diameter piping you need - JNT have 4" for $25 per half

hardest thing to get these days i've found is thin wall 3" straight lengths - took 3 weeks to get a length in

[The BOP]

You buy donuts because you get a tighter raduis than any bends you can get, and to get any angle cut you like they are awsome for making radiators and the like try them out If your in Melbourne pm me and I'll hook you up with some

[STR8E180]

heres a picture