--- In bentechriders@yahoogroups.com, "Nick Lenarz" <n9viw@...> wrote:
>
> --- In bentechriders@yahoogroups.com, "Jim" <obsidian_nj@> wrote:
>
> >
> > BTW, 4130 steel does not need any kind of heat treatment before
> > welding. It can and should be welded as is. Heating an alloy like
> > 4130 to a high temperature would cause the metal to loose strength.
> <SNIP>
> > Jim
> >
>
> So, you're saying that heat-treating 4130 (at least as regards bicycle
> building) is unnecessary? That's a relief! I have a Schwinn Sierra
> with the front triangle made out of 4130, and wanted to use it for a
> project. I was concerned about embrittlement, not annealing, in the HAZ.
>
> Of course, here I come with the curveball: I don't have a TIG welder,
> and while I do have access to a welding group, I don't want to spend
> that kind of money. Now, can I reliably weld 4130 with, say, 7014 arc
> rod, and still not worry about damaging the tubing due to heat flux?
>
This is my first post on here and maybe I am wrong. I have heard that
if you use mig to weld 4130 you should anneal the welds. I have read
this a number of times about frame building with 4130. You wouldn't
have to heat treat the whole frame. Just anneal the welded parts.