General > General Technical Chat
Old School Soldering
<< < (8/13) > >>
pickle9000:
Stained glass was a major user of soldering irons 3/8 inch to 1 inch tips is normal. 120 watt iron is a pretty good size for a half inch tip. Came is the H channel material (solid lead) that the glass slips into. Old pre-electric irons where just that a copper iron in a fire you would have as many as you need to keep up with the job.

It's a very old technology.
helius:
Copper soldering irons were used in this reproduction of the 2200-year-old Antikythera Mechanism:

Showing that a similar tool could have been used to make it.
TerraHertz:

--- Quote from: coppercone2 on January 07, 2021, 09:18:16 pm ---modern acetylene cylinders use THF instead of acetone and there is alot of safety work that went into them since there was a explosion in australia a long time ago. Some of the concerns that people have no longer apply to modern tanks, but all concerns involving gas are still the same.

--- End quote ---

You don't happen to know how to transfer acetylene from one tank to another? I'm curious.

For propane it's easy - gravity and gas pressure in the full tank will push the liquid to the empty tank. Just a matter of fittings, tank orientation, flushing out air, etc.

For general gases, oxygen, argon, CO2, MIG gas, etc, there are high pressure gas transfer pumps. Cheap from China, someday I must get one.

But acetylene... I have no idea. At least of how to do it safely. Must be possible, since cylinders _are_ filled.
Maybe there's some old book(s) from the early 1900's with details, before everything went liability mad. But I haven't found them yet.

It's not such a pressing need, now one can buy gas cylinders outright again. Thank God.
Years ago I swore I'd never again get sucked into the cylinder rental scam.
coppercone2:
Yea I would not fuck with acetylene its cheap enough. Seriously dangerous way to try to save money. Get a portatorch with small bottles.

For high pressure gasses you use higher pressure equalized tanks with flow limiting restriction and a good regulator. The distributors typically have weird gasses delivered and common gasses supplied from a gas battery. I want to say the welding store does not use a transfer pump they just have like 30 cylinders daisy chained together for distribution, the high pressure transfer happens in some professional facility.

When I think of china + thousands of PSI that is bad. How do you know someone did not machine a shitty casting or something. The professional air compressors are the size of a industrial washing machine and run at like 95db+. The frames of all this stuff are built like safes with like 3/8 inch plate being the minimum. Special tech gets paid like 30+ an hour just to service em. I expect the QC for these parts to be very expensive (like a spline shaft manufacturing place). I suspect its welded together with the same standards as military vehicle armor.
iso:

--- Quote from: TerraHertz on January 16, 2021, 10:42:26 am ---
--- Quote from: coppercone2 on January 07, 2021, 09:18:16 pm ---modern acetylene cylinders use THF instead of acetone and there is alot of safety work that went into them since there was a explosion in australia a long time ago. Some of the concerns that people have no longer apply to modern tanks, but all concerns involving gas are still the same.

--- End quote ---

You don't happen to know how to transfer acetylene from one tank to another? I'm curious.

For propane it's easy - gravity and gas pressure in the full tank will push the liquid to the empty tank. Just a matter of fittings, tank orientation, flushing out air, etc.

For general gases, oxygen, argon, CO2, MIG gas, etc, there are high pressure gas transfer pumps. Cheap from China, someday I must get one.

But acetylene... I have no idea. At least of how to do it safely. Must be possible, since cylinders _are_ filled.
Maybe there's some old book(s) from the early 1900's with details, before everything went liability mad. But I haven't found them yet.

It's not such a pressing need, now one can buy gas cylinders outright again. Thank God.
Years ago I swore I'd never again get sucked into the cylinder rental scam.

--- End quote ---
I transfer calibration gases at work from cylinders into passivated canisters, which are not rated for much pressure but the principle I imagine is the same. I put the receiving canister under a vacuum (if it's a calibration gas, down to ~100 mTorr, but for general gas use it doesn't need to be down that far I imagine) then attach it via a bit of stainless steel tubing (usually via a Micro-QT connector) and an appropriate regulator. I then open up the regulator slowly to the required pressure until I can't hear the gas flow anymore. I assume it'd be a similar process for transferring between two larger gas bottles. With acetylene I suspect you couldn't put the old cylinder under vacuum otherwise the saturating solvent would disappear, but maybe if you purged the air out first as you suggest...
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod