Hi all
"Index" note - a sub-conversation started about hydrogen / weld
hydrogen and its investigation in the thread which is
"A small welding job"

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On 1/22/2023 9:30 AM, Richard Smith wrote:

Hi all
"Index" note - a sub-conversation started about hydrogen / weld
hydrogen and its investigation in the thread which is
"A small welding job"

And I've been following that conversation - even though about 85% of
it is over my head . While most of it is gibberish to me , I have
learned from your posts ...
--
Snag
"You can lead a dummy to facts
but you can't make him think."

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Snag <Snag_one@msn.com> writes:

On 1/22/2023 9:30 AM, Richard Smith wrote:

...

And I've been following that conversation - even though about 85% of
it is over my head . While most of it is gibberish to me , I have
learned from your posts ...
...

I am happy about that.
Conversation flows and as you trust in the people you infer things
which are important about the topic.
I did my best to convey the story in http://www.weldsmith.co.uk/career/writing/phd/1701_hmov_weldzone_platesteels_story.html
"Memoir of my Doctoral research endeavour"

If you think our talk is bad enough, don't try to read my thesis :-) http://bura.brunel.ac.uk/handle/2438/4617
"Hydrogen distribution and redistribution in the weld zone of constructional steels"

With hydrogen, I would like to prove it, but people in Europe are far
too concerned about "Is it the lowest hydrogen possible?". I
understand that in North America you tack-weld with 6010's?
A distinct craziness is the insistence 7018's should go in a
rod-oven. If you could have used a 6013, then you can use a 7018 no precautions.
Yes a dried 7018 does burn nicer, with a clean transparent arc, as I
have known. But no metallurgical necessity for modern Western
European steels, which are very "clean" (well-refined) and low-carbon.
Knowing the (Euler-Bernoulli) beam equations, I got some offcut
Rectangular Hollow Section and took it to the hydraulic press, where I
found an "S355" steel (355MPa specification minimum yield)
(my-mpa-to-ksi 355) ;; 51.46994842033917 ;; = 50ksi steel.
yielded at 360MPa.
They control the composition so accurately they "just" make the yield
stress, to give a steel which is lovely to punch, saw, drill, etc.
So you could weld it with cellulosics on a cold day no precautions.

One weekend I was paid quite well and given an assistant to come in
and repair the handrails around the perimeter of a construction barge (flat-topped - being used to store drilled pile tube) after a
collision which has "wiped off" all the handrails and stanchions.
I took cellulosics - 6010's - with me and went around the
scaffold-tube railings full-penetration butt welding them together
in-one, no prep. Yes I then did a quick "wash" with a 6013 give a
smooth surface.
My assistant had never seen anything like it. He felt he had a very
rewarding weekend. His Dad was very pleased and was very solicitious
when I wanted to learn seafaring navigation (the Dad was a skilled
experienced skipper).
All this is because of my Doctoral research leading into good
mentoring from North America.

Best wishes,
Rich Smith

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On 1/22/2023 2:24 PM, Richard Smith wrote:

Snag <Snag_one@msn.com> writes:

On 1/22/2023 9:30 AM, Richard Smith wrote:

...

And I've been following that conversation - even though about 85% of
it is over my head . While most of it is gibberish to me , I have
learned from your posts ...
...

I am happy about that.
Conversation flows and as you trust in the people you infer things
which are important about the topic.
I did my best to convey the story in http://www.weldsmith.co.uk/career/writing/phd/1701_hmov_weldzone_platesteels_story.html
"Memoir of my Doctoral research endeavour"

If you think our talk is bad enough, don't try to read my thesis :-) http://bura.brunel.ac.uk/handle/2438/4617
"Hydrogen distribution and redistribution in the weld zone of constructional steels"

With hydrogen, I would like to prove it, but people in Europe are far
too concerned about "Is it the lowest hydrogen possible?". I
understand that in North America you tack-weld with 6010's?
A distinct craziness is the insistence 7018's should go in a
rod-oven. If you could have used a 6013, then you can use a 7018 no precautions.
Yes a dried 7018 does burn nicer, with a clean transparent arc, as I
have known. But no metallurgical necessity for modern Western
European steels, which are very "clean" (well-refined) and low-carbon. Knowing the (Euler-Bernoulli) beam equations, I got some offcut
Rectangular Hollow Section and took it to the hydraulic press, where I
found an "S355" steel (355MPa specification minimum yield)
(my-mpa-to-ksi 355) ;; 51.46994842033917 ;; = 50ksi steel.
yielded at 360MPa.
They control the composition so accurately they "just" make the yield
stress, to give a steel which is lovely to punch, saw, drill, etc.
So you could weld it with cellulosics on a cold day no precautions.

One weekend I was paid quite well and given an assistant to come in
and repair the handrails around the perimeter of a construction barge (flat-topped - being used to store drilled pile tube) after a
collision which has "wiped off" all the handrails and stanchions.
I took cellulosics - 6010's - with me and went around the
scaffold-tube railings full-penetration butt welding them together
in-one, no prep. Yes I then did a quick "wash" with a 6013 give a
smooth surface.
My assistant had never seen anything like it. He felt he had a very rewarding weekend. His Dad was very pleased and was very solicitious
when I wanted to learn seafaring navigation (the Dad was a skilled experienced skipper).
All this is because of my Doctoral research leading into good
mentoring from North America.

Best wishes,
Rich Smith

In the past your humble responses and respect for the feedback from
those of us who are clearly hacks has made me (if perhaps nobody else)
believe you are "just" an experienced line welder. Somebody who may
have had a trade school education or may not, but has become an expert
welder through years of experience as a production welder. I mean this sincerely. I hope you blew coffee out your nose when you laughed at
some of the things I had to say.

In your various comments (and questions)and their accuracy within my
limited scope of experience as a self taught hack I had come to believe
that you were quite expert in some aspects of welding, but did not
perhaps have a full practical grasp of some of the limitations some of
us face, and while maybe knowledgeable in most aspects of welding
perhaps not so much in areas where you had not expressed a great deal of experience.

I now see that perhaps your expertise is as much academic as practical.
I humbly recognize I under estimated you.



--
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I lack "streetwiseness" as a welder.
I lack the background in the myriad of common jobs a welder-fabricator
would know.
I have to rely on others a lot to show me the way.
Things are good if I have earned enough to get that to happen. Where
there are things I am good at and favours go both ways.

The areas I do "have an advantage" is where the application has a
clear technical structure easily understood with a scientific
background and responds to very systematic working
eg.
* spray-transfer GMAW - steel and aluminum
* cellulosic 6010 SMAW (rare in the UK though)
With these processes, a scientific visualisation of how they work
guides you. I only had to be shown these once to "grasp what's going
on". So these are the things add to the "earned" bank on a job.

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"Richard Smith" wrote in message news:lyr0vl3pqj.fsf@void.com...

I lack "streetwiseness" as a welder.
I lack the background in the myriad of common jobs a welder-fabricator
would know....

-------------------
"Streetwiseness" can backfire. I read of a plane that crashed because an assembler "knew" that the engineer had made a mistake in how a bolt was to
be installed and took it upon himself to do it "correctly".

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"Jim Wilkins" <muratlanne@gmail.com> writes:

"Richard Smith" wrote in message news:lyr0vl3pqj.fsf@void.com...

I lack "streetwiseness" as a welder.
I lack the background in the myriad of common jobs a welder-fabricator
would know....

-------------------
"Streetwiseness" can backfire. I read of a plane that crashed because
an assembler "knew" that the engineer had made a mistake in how a bolt
was to be installed and took it upon himself to do it "correctly".

Yes.
Though...
That could be viewed totally differently as poor communication and
likely a manifestation of past and existing problems in an
organisation.

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"Richard Smith" wrote in message news:lybkmopj3n.fsf@void.com...

"Jim Wilkins" <muratlanne@gmail.com> writes:

"Richard Smith" wrote in message news:lyr0vl3pqj.fsf@void.com...

I lack "streetwiseness" as a welder.
I lack the background in the myriad of common jobs a welder-fabricator
would know....

-------------------
"Streetwiseness" can backfire. I read of a plane that crashed because
an assembler "knew" that the engineer had made a mistake in how a bolt
was to be installed and took it upon himself to do it "correctly".

Yes.
Though...
That could be viewed totally differently as poor communication and
likely a manifestation of past and existing problems in an
organisation.

----------------------------

This is the convention he blindly followed: https://www.kitplanes.com/best-practices-nuts-and-bolts/
"There is a convention that bolts should be installed so that their shanks point inward towards the center of the aircraft, backward towards the tail,
or downward such that gravity will tend to hold the bolt in place if the nut falls off for some reason. This basic rule makes inspection easier and seems logical in the case of a downward orientation, but if clearances or other important considerations dictate some other orientation, no sleep should be lost over violating the rule."

I don't remember where I read the story, or the details of the failure. The plane may have been a military prototype, I don't think it was an airliner.

The aircraft radio prototypes I built had to conform to structural rules,
such as not breaking loose and flying forward in a survivable crash.

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