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Why would heat treatment be necessary? If the rear bridge was tig welded then the receiver likely would not have been heated to a point to damage it's original heat treatment except at the weld lines in the rear bridge.

I'm guessing that Mannlicher actions where case hardened like Mauser receivers. This case hardening was done for the sole purpose of wear reduction of the sliding/rotating action of the bolt. The elasticity of the selected steel for the manufacturing of the receivers is what maintains the receiver shape/dimensions against the pressures of firing cartridges.

I'm not an engineer or machinist I just dabble so what the heck do I know.

Vlad

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Click on the link. Pix show the front ring welded, etc. So I'd think a new process would need to be applied.

He said he was going to have the entire action case-hardened. Now one doesn't necessarily show bright colors as a result but there is no evidence of that on the action pictured. Maybe it was. My question was generally applied to action-making in general. Some are case hardened, some are not. Mausers are, and without the case the action would deform under operating stresses at various contact points. I don't know what processes were used nor what materials were used in the manufacture of Mannlichers. Maybe the same as Mausers? Vintage Mausers tend to be from what I've read low carbon simple steels underneath the case.

Other actions {modern} are not case hardened but rather use different materials and involve a heat treatment regimen. I don't know exactly how that is applied and I'd be interested in seeing it done. Regarding known-problem actions, IIRC whereas some low-number Springfields were actually burnt during heat treatment and thus causing failure of the crystalline structure, Eddystone actions were not burnt, but rather not tempered to low enough of a temperature, thus leaving them brittle. Some Husqvarna 96/38 actions are reported to be brittle likely for the same reason as the Eddystones. I'd still like to see the actual quench process. Hatcher's Notebook has a pretty extensive section on receiver heat treatments but doesn't really show clear fixtures, etc, used.

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