new project

[drivermark]

Curt what grade tube are you using for the rear legs of your springer? If I remember correctly the sample pieces you sent me to match the leg spuds to were only .125 thickness.
That seems a bit skinny for the length. (according to the tables in the handbook)

[curt]

theyre 1/4 chromoly dom had to have them turned down but they are perfect you do excellent work my friend

[drivermark]

With 1/4 inch thickness don't you need to normalize that after welding or am I misinformed?
My understanding is that you need a big ass oven to heat it up and hold it at temp for a while after welding on 3140.

[drivermark]

Oops 4130

[Dusty-Dave]

4130 and 4140 regardless of thickness must be normalized after arc or TIG welding IE heated o a dull red and allowed to air cool to avoid hydrogen embrittlement
Dusty

[drivermark]

That's it? I thought there was more to it than that. For some reason I could have sworn I read that it had to be held at something like 1100-1200 degrees F for a bit (couldn't remember how long) and then cooled very slowly to avoid embrittlement.

[curt]

i heat it like dave and let it air cool have done some structural stuff over the years for work still holding up over ten years old . not sure its the proper way but its the way i was taught

[curt]

got some time welding on the front legs today didnt get pics but more to go tomorrow ill try to get pics . got the bottoms of the tube ground to 45s and drilled the rosette holes . welded the lower lugs in and ground and sanded came out nice couple small spots where i undercut a little but ill fill them in and regrind and sand till its perfect . it was a lot of heat today i dont want to warp anything so slow it is

[Dusty-Dave]

What I described results in normalized cromo. Lots of heat treats for hardness temper etc. What Drivemarak described sounds like a combo of normalizing and annealing. But for the structural I do normalizing is fine.
Dusty

[drivermark]

Thanks for the info guys. What I read must've been the process for annealing, not normalizing.


Thanks again,

Mark

[curt]

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a little more sanding and the front legs will be ready for primer . thanks again mark for making the lugs for me

[drivermark]

Your welcome, if you or anyone else here need any more of them, hit me up. I have since made a ball end cutter attachment for my lathe, so the ends are a little more uniform.

[curt]

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gettin there had to have the stem turned down was way too long . think i might have a deal on a complete evo softail drivetrain i gotta go look next week

[drivermark]

For future reference TC bro's sells pre made stems.
I got 2 of them last fall for just under $30 each.
That's less than what I spent for the ground and polished 1030
that I built the stem out of for my first set of forks.

[curt]

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been a little got the stem machined and up on the lift . got the tank need to mount it and put the sight tube setup in .i really need to find some time to figure out bars