Argon cylinder won't pass test

JOB · Feb 6, 2016

Went to a welding supply to pick up a few things and saw this cylinder. Never knew how they built these these cylinders. A short ways down in the weld you can see a different looking weld, looks like who or whatever welded this had a cold spot there.

markct · Feb 6, 2016

I don't believe that high pressure cylinders are welded, they have always been forged, basically a puck of metal pushed down in the center and the sides extruded upward. That just failed for some reason, not a weld tho

markct · Feb 6, 2016

Here you go
Cylinder manufacturing video

Geo-TH,In · Feb 6, 2016

You don't think a little JB weld will fix it?

Stephen Newell · Feb 6, 2016

Price is a little high though.

Dalex · Feb 6, 2016

Yup , saw it on TV , they are pressed from a plate of steel.

Steve@Advance · Feb 6, 2016

That's quite a process, haven't seen that one. They been making them for a long time, some amazing machinery!

IA Roy · Feb 6, 2016

That was enlightening when I saw it on TV a month or so ago. Watching them make chain is fascinating. That is one of my favorite shows. I DVR all episodes and skip over or delete the reruns. It is my 6 year old granddaughter's favorite show.

IA Roy · Feb 6, 2016

I was watching them make aluminum scuba tanks recently. They start with a thick slug and only draw it once. It really shoots out of the die. I think the rest of the procedure is similar to the steel tanks.

Steve@Advance · Feb 6, 2016

I saw the one about chain... I want to see the machine that makes the necklace chain, the ones about the size of a hair!

DR. EVIL · Feb 6, 2016

Actually, the process is called "DEEP DRAWING". Lots of tall slender tanks are made that way, fire extinguishers, oxygen, argon, CO2 tanks, acetylene tanks, and scuba tanks of several different metals, steel, stainless steel, aluminum. Same basic process makes NIBCO sweat solder copper plumbing fittings.

504 · Feb 6, 2016

It looks like someone struck an arc on it. We see arc burns on mig tanks from people hanging the gun on the tank and they get a little spark to the tank(maybe a trigger bump and some times they just have a little power left in the wire). The safety guys say that once a tank has a burn on it, it will fail,maybe next week, maybe in 10 years, but it will fail.

JOB · Feb 7, 2016

That was a interesting video. Can't argue with the video. That rupture in the cylinder was a nice straight line thought. Sort of looked like it could have been a weld with a cold spot.

Dusty MI · Feb 7, 2016

(quoted from post at 21:16:37 02/06/16) It looks like someone struck an arc on it. We see arc burns on mig tanks from people hanging the gun on the tank and they get a little spark to the tank(maybe a trigger bump and some times they just have a little power left in the wire). The safety guys say that once a tank has a burn on it, it will fail,maybe next week, maybe in 10 years, but it will fail.

I have a mig that the gun is hot when ever the mig's switch is on. The gun switch only turns on the wire feed and gas. Don't remember for sure but I think it's a Century.

Dusty

SCUBAInstr · Feb 9, 2016

That cylinder failure is due to internal corrosion of the cylinder wall, and possibly the failure of a burst disk, which should had released the pressure at 4/3 or 5/3 the working pressure. This tank was probably never visually inspected not Hydrostatically tested as per the Manufacturer guidelines. Miracle someone wasn't hurt.

Tommy Duvall
PCI-PSI Visual Cyl Inspector #28031

Argon cylinder won't pass test

JOB

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