HIC, HAC, UBC, it's Hydrogen trapped in the weld metal live!

By lo-hi

Date 10-05-2014 18:41

simply amazing, and thanks a bunch.

By qcrobert (***)

Date 10-07-2014 19:38

Haven't seen that demonstration in years, thanks Henry.

Btw do you still have that lab coat? :eek:

Robert

By ssbn727 (*****)

Date 10-07-2014 22:07

Hey Stranger! :surprised:

You should get on here more often QC! Robert, we do miss you here! :grin:

I don't want to get inot the habit of calling you "Stranger" every time you decide to grace us with a cameo - CAPECHE?

Seriously, How is everything going these days? We got to catch up okay? Remember that this place will always be your second home my friend!

Now as far as my lab coat is concerned, that coat disappeared so long ago that I haven't a clue to where it ended up... It probably wouldn't fit me anymore even if I were to miraculously find those rags... :surprised:

The lab coats I did have one time were dark navy blue with yellow gold stitching for my name and I had one for every day of the week except Saturday and Sunday...

Yes sir! That school did know how to dress their instructors... They didn't have a clue about what they should have been compensating us for our time but that's a totally different conversation... And since I have wandered off topic briefly, I'll just say that Man doesn't those Hydrogen bubbles look awesome wiggling their way out of the metal and then witnessing the damage they cause as the metal solidifies and has cooled to ambient temperature! :surprised:

I don't know why somebody doesn't film a modern version of this flick because, If that isn't convincing enough when witnessing the Hydrogen escape and seeing some bubbles still entrapped @ various locations in the weld metal then Nothing could convince these kids in the classrooms who are wondering what we're attempting to convey to them with an illustration or just a demonstration alone... It's an awesome teaching presentation IMHO! :grin:

Finally, again please don't keep yourself scarce by not showing up in here as often as you used to Robert! We really do care and miss you here, and enjoy reading your own contributions also okay? :grin:

Respectfully,
Henry

By CWI7611 (**)

Date 10-13-2014 04:24

You can click on the link and watch the old film or in a column on the right side of the Youtube link you can see a video titled Hydrogen Diffusion in Welding or something like that by Bill Bruce. There is a lot of narrative prior to the actual demonstration or you can do it yourself in your own welding area, shop, jobsite, etc.. Just take some E-XX10 electrode and weld a short strip on plate and let it cool a little then dunk it in a jar or clear container of glycerin or even mineral oil. The more viscous fluid will slow the hydrogen bubbles down so you can see them. What's really impressive is to take a Low Hydrogen electrode, not a moisture resistant type, and leave it out overnight or a couple of days then weld with it and dunk it in the fluid. You will see why you should throw those electrode away after they have been out of the oven or hot box for too long.

Good luck and enjoy. If you do this in front of a bunch of students you will be a hero, it is impressive.

By ssbn727 (*****)

Date 10-14-2014 01:11

I already have many moons ago... I'm glad you enjoyed the movie everybody! :grin:

Btw, No disrespect but, this topic has been discussed here many, many times already, and my friend Al has shared a similar visual demonstration as well as the countless other discussions in quite a few threads regarding this phenomena... :roll:

Do you have any other content that you could share with us because it would be more than welcome? :smile:

Here's just one thread of many discussing Low Hydrogen electrodes, and similar photo's from Al also showing the hydrogen escaping represented by those "tiny Bubbles" rising from the metal in the baby oil:

http://www.aws.org/cgi-bin/mwf/topic_show.pl?tid=11508;pg=1

Here's another video:

http://www.dnvusa.com/resources/video/HydrogenDiffusionDemonstration.asp

Here's a video of a gentleman explaining how hydrogen diffuses through a palladium membrane steady state(Lot's of math):

https://www.youtube.com/watch?v=QNPcBAWXk50

Here is a much better to understand video describing how hydrogen diffuses through a palladium membrane (plate) with a lot of math also:

http://vimeo.com/38036642

Quantum Effects in the Diffusion of Hydrogen on Ru(0001) - (Note: extremely scientific with a lot of chemistry written in this article:

http://pubs.acs.org/doi/full/10.1021/jz400622v

Here's an interesting article for those folks who work in the oil patch:

http://www.ogj.com/articles/print/volume-106/issue-36/transportation/cp-changes-address-hydrogen-diffusion.html

This on is written about how to find better ways of storing hydrogen - a not so easy task with just any metal described better by reading this article:

http://www.renewableenergyworld.com/rea/news/article/2013/08/electrochemical-step-towards-better-hydrogen-storage

Hydrogen Diffusion on Si(001) I know that it's not directly related to the topic but, I just though it was cool enough to share. Watch this if you wish, or not:

http://groups.physics.umn.edu/stmlab/hydrogen_diffusion/hydrogen_diffusion.htm

Here's a Scanning Tunneling Microscope clip of showing the diffusion of a single ad-dimer on a Si(001) surface at 475K:

http://groups.physics.umn.edu/stmlab/Animations/movies_fr.html

STM images showing the diffusion of a single dimer along a dimer row at 410K. Unlike our other movies, this is composed of empty state images, so the surface rows appear dark and the troughs appear bright. The dimer's orientation flips between parallel and perpendicular to the rows (types A and B respectively) while it progresses along the row; however, at this temperature the two orientations are indistinguishable:

http://groups.physics.umn.edu/stmlab/Animations/movies_fr.html

And remember we had a discussion regarding Si islands? These are STM images showing the fluctuations of islands at 620K. The edge rows of islands fluctuate the fastest, and when fluctuations at one's two ends cross, the row disappears. Due to the sticking anisotropy, it is then difficult to nucleate a new row, and the island shrinks. Note that the small lower right hand island disappears all together:

http://groups.physics.umn.edu/stmlab/Animations/movies_fr.html

Okay! Let's get back to hydrogen diffusion as it relates to welding steel with this article and it refers to ferritic steels: "How do I measure the diffusible hydrogen level in my ferritic steel weld?" :

http://www.twi-global.com/technical-knowledge/faqs/material-faqs/faq-how-do-i-measure-the-diffusible-hydrogen-level-in-my-ferritic-steel-weld/

If anyone's interested in taking a course in Diffusion as it relates to Solid State Chemistry online from the OpenCourseWare @ MIT then here's a link for you:

http://ocw.mit.edu/courses/materials-science-and-engineering/3-091sc-introduction-to-solid-state-chemistry-fall-2010/reactions-and-kinetics/24-diffusion/

Oh, here's an online course on blacksmithing and physical metallurgy from OCW @ MIT (For you Superflux! :grin:

):

http://ocw.mit.edu/courses/materials-science-and-engineering/3-a04-modern-blacksmithing-and-physical-metallurgy-fall-2008/#related

Here are some of the projects in the course:

http://ocw.mit.edu/courses/materials-science-and-engineering/3-a04-modern-blacksmithing-and-physical-metallurgy-fall-2008/projects/

Anybody want to take an online course on Welding and Joining Processes from OCW @ MIT? You can go here and see if you're interested, and Professor Thomas Eagar is presenting this course... Download the materials and you'll see some lecture notes and assignments:

http://ocw.mit.edu/courses/materials-science-and-engineering/3-37-welding-and-joining-processes-fall-2002/index.htm

Well, that's it for me... I feel like I'm coming down with something so, I'm gonna take some tylenol (less than 2K mg.), get under the covers and sweat this out I hope.

Respectfully,
Henry

By CWI7611 (**)

Date 10-18-2014 11:33

Some of that math hurt my brain.