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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Here's my cool pic.
What the heck is it?
This is a badly beat up cold trap that I dismantled to do some repair work on. Somehow the inner wall was crushed into a triangular shape! It was soo sad, but even with my poor metal shaping skills I got it back into what resembles a cylinder. First challenge finished.
Second challenge, soldering stainless steel! After about 10 tries to solder the stainless, I finally succeeded. This is a major milestone for a guy like me, who doesn't know hardly anything about metals. I researched soldering stainless and applied what the articles said, and they were all wrong except for one. It takes the right flux and right solder to really do the job. And this job is very critical because this cold trap is going to be used on my ultra-high vacuum pump cart.
So any of you guys thinking soldering stainless steel is easy, I say give it a shot, soldering 304 stainless isn't as easy as you think if you're using the wrong stuff.
Inner wall cylinder under vacuum testing solder seal integrity. Gauge holding at 76cm. I still have to solder the inner lip for an inner and outer seal. Then I have to rejoin the steel lip to the outer canister without ruining the inner seal.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
At what pressure? I'm assuming that it is around atmospheric pressure cause of the arc and also than plastic bottle is not being crushed or expanding. Also would the heat from the arc melt the plastic? Wow very cool. It would be cool to do it with diff gasses too.
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
Yeah the ladder was filled to about 1atm. The pressure would rise when it heated and decrease when it cooled, though. I ran it for like 5 hours last night and the bottle barely got warm. Before I added the argon, with just air inside, it got hot rather quickly and was about to melt. I don't know what the difference would be, but there clearly is one.
Any speculation what this is?
I suspect either a large capacitor discharge, or a muzzle blast from either a railgun or a regular gun of some sort.
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Post Your Cool Pic Here!
It would be cool to do it with diff gasses too.
