Fronty Owner

when the cylinder body is welded my the manufacturer, they will pre-heat the body, do the weld, wrap it up to slowly cool, then post weld stress relieve the body.

This is the same reason Dodge/Ram frowns on welding to the frames on the new trucks even tho all their brackets are welded in place.

j_martin

Wow, that's amazing. The carbon steel pressure vessels I'm familiar with, unless they're for an extreme and dangerous service such as steam power plant service, don't get all that. Most get welded with whatever process is appropriate, usually sub-arc, then sometimes post weld heat treated, and X-ray, ultrasound, dye-penetrant, etc inspection. Of course metal is tracked, everything's documented, etc. Paperwork is immense.

I highly doubt that farm store grade wood splitter cylinders get any of it.

I'm not a mechanical engineer, but I work on the electronics involved at a world class tank manufacturer, so I'm around it a lot. They have a rail car bottom heat treatment facility that'll do everything from rocket nose cones to a tank, 18' in diameter, about 125' long, 600,000 lbs, to over 2000°.

Fronty Owner

It depends on the metals used. carbon steel (A106B or A105 modified forgings) dont usually require a post weld heat treatment. Heat the moisture out of the metal and weld it. We use it on low pressure and structural stuff. When you start talking 5000 to 15000 PSI, its low alloy steel, that has a yield strength that is 3 times that of carbon steel.
MTR, weld maps, PQR, WPS, and a cert for anyone that even glanced at the part is usually included in the product file.

farm store grade wood splitters still use off the shelf cylinders. they may be using carbon steel, they may also be using low alloy to simplify their inventory and limit confusion during manufacture.

Bark

Im pretty good with JB Weld. If JB Weld wont fix it, I will pitch it.

j_martin

Most wood splitters run a 2 stage system, 600-700 psi till it hits a hard spot, then 2000-3000 psi for the grunt work. No where near 5000 psi.

gorms

I guess all that don't matter if I ram another log into it, maybe I'll make a braket to hold the body somewhere else.