Forced restoration of 900SS after finding crack in frame. - Page 3 - Ducati.ms - The Ultimate Ducati Forum
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post #21 of 464 (permalink) Old Mar 23rd, 2015, 2:48 pm Thread Starter
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With the small quantites that I have of the tubes it would be impossible to use weight as a definitive way of working out what is and is not Chromolly steel. I have used a series of crude tests to come to the conclussion along with the NZ Ducati agents verifying our conclussions as well, though they could not tell me exactly what grade of Cromoly steel they were manufactured from. I have the actual material spec listed down some where but at the moment I seem to have miss placed it.
For the purpose of this repair I am going to proceed with the belief that it is Chromemolly 4130 (or an equivalent there of. To that end and having spoken to our Aeronautical metal workers and welders in the Royal New Zealand Airforce they have recomended that i use MESSER MG600 tig welding rods. This rod is designed for maxmium strength and is the best rod to use for joining disimilar metals if you are not 100% sure what the metals actually are. Apparently the RNZAF use alot of this for various welding jobs for some of the historic aircraft that we still fly.
As far as not MIG welding Chromemolly steel - have a look at the robitic welding of the KTM frames - manufactured useing Chromemolly steel and MIG welded.
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post #22 of 464 (permalink) Old Mar 25th, 2015, 10:57 am
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Makes good sense. Looking forward to watching your progress!

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post #23 of 464 (permalink) Old Mar 25th, 2015, 2:51 pm
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Originally Posted by Combi245 View Post
Apparently the RNZAF use alot of this for various welding jobs for some of the historic aircraft that we still fly.

That has to be one of the best walk up start to have a jab at a Kiwi statements I've seen in a while. But it might be prudent to wait till after the One Day Cricket finals this weekend (assuming Australia actually make it past India)


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post #24 of 464 (permalink) Old Mar 25th, 2015, 3:59 pm Thread Starter
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The piece of 3.2mm plate 4130 for the gusset has turned up and I am just waiting on the welding rods and the tube to follow suit. Have been practising my welding on some heavy tube sections and I am grogessively using thinner wall section tube and getting tighter and smaller with the welds just to get familiar with welding plain steel - its been a while since I had to do any.
Yes it will be good to see the Black Caps win the World cricket cup - the last match was certainly a cliff hanger to watch.
Yes most of our aircraft are old - we still have a Havard in use and it is only just in the last couple of years that we retired the Soiux helecopter. The Iroquois are been taken out of service within the next month or two - just shy of the 50 years in service within the RNZAF I believe. The Hercules has just hit 50 years in service as well.
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post #25 of 464 (permalink) Old Mar 26th, 2015, 3:48 am
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Something out of the blue here.
Could it be that your type of tank brace mount stresses the frame more and causes it to crack?

Being solid from left to right, it can't flex as much and causes the cracking.

The frame on my '92 SL and my trackbike have a tank brace mount like this one

I think a setup like this tolerates more flexing, so less prone to cracking.
Knock on wood: no cracks spotted yet.
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post #26 of 464 (permalink) Old Mar 26th, 2015, 2:49 pm
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There seems to be several variations of reinforcements over the years and they still cracked.
Here's my `95 before I had it repaired / welded at FrameCrafters in Union IL.
In this case the crack began at the weld and propogated around the base of the weld blob where a stress riser was created.

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post #27 of 464 (permalink) Old Mar 26th, 2015, 3:21 pm
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Ok.... my thinking seems to be off...
Hope I won't find things like that.

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post #28 of 464 (permalink) Old Mar 26th, 2015, 3:47 pm
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Forced restoration of 900SS after finding crack in frame.

I had a similar tank mount and crack as in last picture.
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post #29 of 464 (permalink) Old Mar 27th, 2015, 1:15 am
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Quote:
Originally Posted by Dave G View Post
That has to be one of the best walk up start to have a jab at a Kiwi statements I've seen in a while. But it might be prudent to wait till after the One Day Cricket finals this weekend (assuming Australia actually make it past India)
Sorry to interrupt, but the Aussies actually thumped the Indians and will now roll the Kiwis convincingly.

But I am surprised that anyone from California knows anything of such exotic sports - are you an ex-pat Dave-G?

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post #30 of 464 (permalink) Old Mar 27th, 2015, 2:16 am
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