Don,
I didn't do any welding on the bar. I simply heated it up with a rosebud tip,
so I could bend it. I don't know what state of hardness it had to start with.
Is it tensile strength that determines the stiffness? Sorry, I had a course in
material science and one in strength of materials, but all that has departed the
memory banks.
Larry
elliottd wrote:
> Larry - I would suggest you check the tensile strength of ordinary mild
> steel as well as what the book says for 4140. When you weld the 4140 (or
> most other high tensile steels) the heat from the welding will anneal the
> 4140 so the roll bar (around the welds) is only the strength (or close to)
> the strength value for ordinary Mild Steel (1010).
>
> Heat treating the roll bar will put the strength you quoted back in - and it
> will be that strength all over. A stronger roll bar will not only add
> rigidity to the frame of your TR3A, but it will stay where you want it to
> stay, if the day ever comes where you .......... heaven forbid.
>
> Talk it over with a friendly heat treat shop. They will be able to explain
> it.
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