| [ Total Views: 1219 | Total Replies: 4 | Thread Id: 63520 ] |
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 2443TT
A.k.a.: Ian
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| posted on July 3rd, 2007 at 07:32 PM |
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Welding cylinder heads, distortion?
Hi all,
I've got a question for those out there that have welded cylinder heads.
My question is about distortion of the head and will I expect any.
The heads are CB competition eliminators. I have had the middle 3 of the lower 5 cooling fins milled off the heads and am having water jackets welded
on them. I figure because the welding will be being done to whats left of the cooling fins which is an inch or so from the solid material around the
combusion chambers this should prevent any distortion of the combustion chamber.
Thoughts anyone?
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2443TT
A.k.a.: Ian
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| posted on July 3rd, 2007 at 07:56 PM |
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One other thing is what kind of rods should I be using? I am told for cast alloy I need to use a high silicon content rod. CE heads are aparently
made from cast 356 alloy so will this affect the rod choice?
Cheers,
Ian
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on July 3rd, 2007 at 10:05 PM |
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I am thinking you are right about the minimal distortion,
but be prepared to do a little bit of flycutting or squaring up just in case.
Give CB a call and have a chat with Pat.
He has welded those castings quite extensively
and will know which rod to use, and if distortion is at all a worry.
That's my thoughts.
| Quote: | Originally
posted by westi
That's mad Alan.
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2443TT
A.k.a.: Ian
Fahrvergnugen
Posts: 962
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Registered: December 11th, 2002
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| posted on July 3rd, 2007 at 10:23 PM |
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Thanks Dave, will do.
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 vw54
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| posted on July 4th, 2007 at 06:35 AM |
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when welding an alloys its best to pre heat the whole item evenly before you weld
prepare the area first grind or vee out and clean the area to be welded
heat the head in a oven evenly to about 150C and allow a decent soak peroid say min 1 hour for a head allows the heavy section to be heated evenly
and penetrated
remove an do welding as quick as you can cover with a heat blanket to minimise heat loss
after welding complete put back in the hot oven and allow to stabilise once again for 1 hour or so then switch off the oven and allow to slow cool
dont remove before its cold
we used this method at Qantas for welding aircraft parts very minimual distoration if any at all
You could also tak weld the jackets into position before heating the heads up would make the job easier and a tak weld wont effect the distoration
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