Do not weld on 4130 in the high temper states ie yield strength over
100,000 PSI. The weld arc will locally destroy the high yeild strength
you paid for and provide a discontinuity that provides a site for cracks
to start.
If it is on the end where there is little or no stress, then welding is
not much of a problem.
de n0yvy steve
Jonathan Starr wrote:
>
> I also was setting up my new 4130 mast today. Mine is 3"
> dia. and 26' long. I needed to cap it, and rather than try
> to weld it I got a short 3" galvanized pipe nipple and a
> galvanized end cap. The nipple is a slip fit over the 3"
> mechanical tubing, and by painting the end of the mast with
> epoxy before sliding the nipple/cap on, it makes a nice
> tight endseal. The same system will work with 2" mast.
>
> For a lift ring, I put 3 3" u-bolts on a short piece of 3" x
> 5" angle and put a shackle through the 3" leg. Again, easier
> than welding.
>
> Aloha,
>
> Jonathan KH6X
> kalepa@maui.net
>
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