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Discussion Starter · #1 ·
Im getting ready to sleeve my draglink but I have a question first. Im currently running 1.25" Chromoly tubing and I want to sleeve it with 1/4" thick tubing so that its a total of 1.75" in diameter.
My question is this. Can I Sleeve it with regular steel tubing or does it have to be Chromoly tubing?

Thanks for any help.
 

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You can use both to sleeve it. Chromo. makes a better weld in MHO. Now go get it... <IMG SRC="smilies/smokin.gif" border="0"> <IMG SRC="smilies/laughing.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">
 

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You can use either. Chrome moly is stronger, but 1020 is probably going to be plenty once you go that big. When you weld to chrome moly you should normalize it after welding.

To normalize the tubing after you weld it, just let it cool normally and then heat it with a torch until it just barely begins to change color. and then let it air cool again.

The reason you have to do this is because the chrome moly alloys are air hardening which means that they form martensite when you cool them from over 1800F in air. Martensite is hard and brittle, also from teh weld there are residual stresses that are caused by the metal contracting as it cools. To change the martensite into tempered martensite which is strong and ductile, and the way the chrome moly alloys were designed to be used, you need to heat it up. There are tons of combinations of times and temperatures that will give you different material properties, but the practice that is comon in aircraft and racecar fabrication is just to heat the weld area with a torch until you get a faint bit of color in the metal. This is about 3 time hotter than you meed to get it, and you need to make sure not to get it too much hotter because if you get it up to 1800 degrees again you will again form martensite.

In this application if you didn't normalize you would probably be fine, but it is steering so do it right.
 

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Discussion Starter · #6 ·
Well I got the tubing. I had to settle with 1.5" diameter since they dont make the 1.75" I needed. O-well im sure the 1.5" will be strong enough for the hydro assist steering setup. Thanks again guys!
 

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someone give Gordon another little <IMG SRC="smilies/skull.gif" border="0"> great info!

[ 10-12-2001: Message edited by: Cutter ]
 

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No kidding. I was trying not to learn anything today though damnit!!! <IMG SRC="smilies/smile.gif" border="0">

Originally posted by Cutter:
<STRONG>someone give Gordon another little <IMG SRC="smilies/skull.gif" border="0"> great info!

[ 10-12-2001: Message edited by: Cutter ]</STRONG>
 
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