4130 - bad news...

"Rich S." wrote in message ...
wrote in message
...

Brazing high strength alloy steel components of automotive bodies is
STRICTLY FORBIDDEN.

I know that flame welding of HSLA's is verbotten by the Mfg's, some
state laws and common "good practice" but as far as I know brazing is
OK, though I don't know why anyone would want to when MIG is so quick
and clean. In fact I know that at least one US Mfg. MIGed some
pannels (primary structure)with brass wire, and probably still does.
Also from what I have been reading this "good practice" of MIGing HSLA
may be based on poor science. Seems that the common alloy used by
most autobody shops in their MIG's creates some poor welds due to
migration of the niobium and vandamanium in the HSLA into the HAZ
resulting in the potential for cracking. But...............

B. Weren't we talking about the use of this steel in experimental airplanes?
(Actually, by "where" I meant "where in the world is such brazing "STRICTLY
FORBIDDEN" - which you answered in "A".)

Lets get back to finding a replacement for the 4130 used in
homebuilding. Then we can hash out the best way to fuse it for our
uses.

Is something like an HSLA mmanfactured to ASTM A606 (type 2 or
type4)standard suitable for aircraft parts formerally made of 4130?
Even if it isn't a 100% substitute for 4130 in a closely designed
structure, would it be acceptable for aircraft use if the part were
redesigned (upsized one size?)to better match the HSLA's strength? Is
sheet in thicknesses used by homebuilders available in this alloy?
For a reasonable price?
========================
Leon McAtee