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Broken cast iron barrel fin fix? #424225
03/14/12 7:56 pm
03/14/12 7:56 pm
Joined: Oct 2010
Posts: 26
Vancouver Island
Display Name Offline OP
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Vancouver Island


Unfortuatley, damaged in transit. Fortunatley, probably as easily accessible as could be. Is this a repair any decent welder could fix or should I seek out a "specialist".

Thanks,

Andy

Last edited by Display Name; 03/14/12 7:58 pm.

It's not the destination, it's the journey....

...which is just as well, I'm on a Bantam.
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Re: Broken cast iron barrel fin fix? [Re: Display Name] #424282
03/15/12 2:25 am
03/15/12 2:25 am
Joined: Jan 2004
Posts: 3,568
ca, us
D
DMadigan Offline
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ca, us
You cannot weld cast iron. There are nickel based brazes and brass brazes that will work.

Re: Broken cast iron barrel fin fix? [Re: DMadigan] #424302
03/15/12 5:00 am
03/15/12 5:00 am
Joined: Oct 2010
Posts: 26
Vancouver Island
Display Name Offline OP
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Vancouver Island
Thanks,

I'm now better informed!

Andy


It's not the destination, it's the journey....

...which is just as well, I'm on a Bantam.
Re: Broken cast iron barrel fin fix? [Re: Display Name] #424333
03/15/12 1:12 pm
03/15/12 1:12 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

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Alex  Offline

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Joined: Sep 2002
Posts: 7,812
Seattle
I've Mig and Tig welded cast iron. Sometimes it works, sometimes it doesn't. The good news is that it usually works on barrel fins and with fins it really doesn't have to be phenomenally strong...preheat also helps.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: Broken cast iron barrel fin fix? [Re: Alex] #424381
03/15/12 10:17 pm
03/15/12 10:17 pm
Joined: Aug 2001
Posts: 3,348
Michigan, USA
BONZO R.I.P. Offline
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Happy Birthday BONZO R.I.P.  Offline
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Michigan, USA
I've seen fins attached with a mig welder thT looked pretty good (probably stainless wire,I only saw this in a video)preheat is the way to go , aas well as post heat .The trickk I have heard is to place the pieces in an old charcoal grill buried in the coals . By the time the coals are glowing the pieces should be evenly and slowly heated . attach the fin and place back in the coals for a more controllled slow cooldown.This is to prevent a rapid heating/cooling that tends to crack along the joint.I've never tried this .

FWIW-BONZO

Re: Broken cast iron barrel fin fix? [Re: BONZO R.I.P.] #424390
03/15/12 10:50 pm
03/15/12 10:50 pm
Joined: Jan 2008
Posts: 1,516
Farmington,Connecticut,USA
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Farmington,Connecticut,USA
It can be braze-welded with a little prep.
Bevel the surfaces and apply a 'tinning' pass of brass rod with an oxy-acetelyne torchh with the flame set to 'carburizing'.
Thin fins should respond well to a pre-heating from the torch.
Then you can easily pass a smoth bead of pooled brass to quickly fill the gap.
Pre-heating helps to prevent shrinkage problems with the joined surfaces.


1978 Bonneville T140V PX
Re: Broken cast iron barrel fin fix? [Re: DMadigan] #424427
03/16/12 2:33 am
03/16/12 2:33 am
Joined: Jul 2009
Posts: 3,549
Vic. Australia
P
Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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Joined: Jul 2009
Posts: 3,549
Vic. Australia
Originally Posted By: DMadigan
You cannot weld cast iron. There are nickel based brazes and brass brazes that will work.

Google-search "Henrob cast iron",or just watch this Fusion welding cast iron with Henrob torch

I've done this,using cast iron filler rod (old piston ring).It would take a lot of pre-heat to avoid shrinkage problems if you weld a fin back on like this.The whole barrel would have to be red hot.

Re: Broken cast iron barrel fin fix? [Re: Display Name] #424438
03/16/12 3:58 am
03/16/12 3:58 am
Joined: Jan 2004
Posts: 3,568
ca, us
D
DMadigan Offline
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Thanks Pete, I had not seen that before. I would still prefer to braze the fin to reduce the heat required. If it was the base flange then definitely.

Re: Broken cast iron barrel fin fix? [Re: DMadigan] #424444
03/16/12 6:01 am
03/16/12 6:01 am
Joined: Sep 2008
Posts: 284
Goldendale, Washington
4
40 Below! Offline
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Goldendale, Washington
I've used MIG on cast iron several times, engine blocks, carb flanges etc. Lay a little puddle(till it just wets out) and get out. Let it cool completely and hit it again. I believe that preheat on small pieces sets up stresses. Veed out and surgically clean is the key, as small a vee as you can possibly get away with. IMO nickel stick and braze imparts way to much heat.


"Growing old is obligatory - growing up is optional"
70 TR6C, daily ride
66 TR6SR(750 street tracker)
?? TR25 ice toy
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Re: Broken cast iron barrel fin fix? [Re: Display Name] #425401
03/21/12 2:59 am
03/21/12 2:59 am
Joined: Jun 2002
Posts: 47
philadelphia
S
supertrump Offline
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philadelphia
i would braze a reinforcing bracket perpendicular to the break tha bridges the gap to the next fin.just sort of a small shelf or stud to reinforce,but not stop heat from escaping.then braze the break and paint the braze black.

Re: Broken cast iron barrel fin fix? [Re: Display Name] #432744
05/01/12 6:34 pm
05/01/12 6:34 pm
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline
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Clarksburg, WV USA
Display,

The flat-head screw idea made me think...

If it's not a show bike, why not just locate and (3/32") pilot-match drill the broken and 2nd fin approx. 3" or so apart, tap the 2nd fin for 2pcs #8 or #10 s/h flat-head screws (drill and countersink the broken one out to fit the screw) and just screw the top one down tight, using a few washers as spacers. Out of sight...out of mind.

My $0.02


'70 TR6R Chop (always in process)
Re: Broken cast iron barrel fin fix? [Re: Pete R - R.I.P.] #432775
05/01/12 8:23 pm
05/01/12 8:23 pm
Joined: Apr 2012
Posts: 110
Eureka Ca.
R
revnosebone Offline
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Eureka Ca.
I wonder how well that torch would work on frame tube? I've welded a cast iron water jacket on my 1937 John Deere with nickel rod but can't remember the alloy as it was in the late eighties. It can be done.

Last edited by revnosebone; 05/01/12 8:26 pm.

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Re: Broken cast iron barrel fin fix? [Re: Display Name] #433485
05/05/12 6:40 pm
05/05/12 6:40 pm
Joined: Nov 2001
Posts: 98
Netherlands
J
Jacco van D. Offline
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Netherlands
Welding cast-iron with a high percentage nickel rod is possible. Avoid fast cooling therefore warm it up before start with welding. And weld short patches. Not complete length in one run.


Triumph T100T 1969
Triumph TR6R 1972
Triumph T25T 1971
BSA B25 Fleetstar 1968
Laverda 750SF 1971
TWN Boss 1954
Re: Broken cast iron barrel fin fix? [Re: Display Name] #433530
05/06/12 1:45 am
05/06/12 1:45 am
Joined: Apr 2007
Posts: 753
Brisbane, Australia
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Brisbane, Australia

I had an A65 cylinder repaired by these guys

http://www.metalmend.com.au (cant get this site up at the moment)

for the same reason. Top fin also.

I believe some sort of arc weld was used, because I was a bit surprised as I had heard all the stories about "got to be brazed"

Got 7000 miles on it now and still good. Not entirely attractive, but it's not seen anyway.

Cheers
Ray


BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
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Re: Broken cast iron barrel fin fix? [Re: Display Name] #433812
05/07/12 10:05 pm
05/07/12 10:05 pm
Joined: May 2012
Posts: 23
calif
T
Tintop48 Offline
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calif
for what its worth, cast iron cracks on cooling. to re-attach the fin bevel one end of the broken piece lightly then cold weld to the barrel. a couple of small tacks the lightly peen the tacks with a hammer to help against shrinkage,let cool till you can keep your hand on it then repeat the process as needed. done a lot of cast this way without problems.PATIENCE IS THE KEY.

Re: Broken cast iron barrel fin fix? [Re: Display Name] #433884
05/08/12 10:14 am
05/08/12 10:14 am
Joined: Apr 2005
Posts: 2,332
Bega NSW Australia
Mark Parker Online content
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Mark Parker  Online Content
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Bega NSW Australia
JB weld is probably the simplest and easiest, I've used it to fill holes and shape inside inlet ports on alloy heads, I don't see why it wouldn't hold a fin on. Have you tried it on a fin Overandout?


mark
Re: Broken cast iron barrel fin fix? [Re: Display Name] #433938
05/08/12 5:32 pm
05/08/12 5:32 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

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Alex  Offline

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Posts: 7,812
Seattle
I've used JB weld on a fin. Held for about a year until I knocked it with a wrench...whence it came of pretty easy. JB is great to fill but not great for structural stuff.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.

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