2394 And 2395 - Any Pointers?

[Steve2381]

Hello all

I am doing my 2394 and 2395 in a few months, so I need to get my head into the books and learn this stuff.

I struggle with exams and learning, so I am giving myself so time to really drum this stuff home.

Got the 17th edition regs, GN3, GN8 and onsite guide.  Any other recommended reading?

Any pointers to past papers (2394, 2395 or 2391).... anything will help!

Many thanks all

 

[MeFil]

Buy the exam success c&g 2394/5 book. Tells you the how they want you to answer the questions. Saves a lot of wasted time writing unnecessary stuff in the exam.

Only other books you need are regs book and gn3.

 

[OnOff]

PM me an email. I have a load of past 2391 questions I can send you.

 

[Steve2381]

Thanks Onoff.  Can't seem to find the PM function anywhere - not under my name top right as the help files say.  It also won't let me search members.

Also - I can't put my email in this thread because it says I must do 10 posts first... arrgh!

So...     Steve2381@aol. c o m.  

Many thanks!

 

[Sidewinder]

Steve,

I believe that you need 10 posts before you can send PM's, it's to stop spamming.

Stick around, we do have a few ex-tutors on here who can help, and a dedicated student section.

 

[apprentice87]

Hi There,

When i did my C+G certs, [welding] I never even bothered going to the classes... and i still got 12 distinctions and 2 credits.......

Here is what i did;

Got a copy of the syllabus and made a list of everything that was in it, all the subject areas I mean.

I bought every book i could on the subject then, and wrote MYSELF loads of questions. What i mean is; Say the first sentence in the book was, "A giraffe is a big tall yellow thing" I would write myself a question, "What is a giraffe"

I wrote literally THOUSANDS of questions covering EVERY area of he syllabus, and made sure i could answer ALL of them off the top of my head.

This will teach you far better UNDERSTANDING, and not just "facts"

I wrote stuff like this....

13, Describe Youngs modulus, Hookes law, and Poissons ratio.
14, Why do hardness tests, carried out on the same material, using different methods, give differing results.
15, Describe the solidification of metals.
16, Describe crystalline and amorphous solids with examples.
17, Describe, allotropy, isotropy, anisotropy, give examples
18, Define and show formulae for yield point, UTS, E, percent elongation, and percent RA.
19, Describe the mechanics of elasticity.
20, Fully explain the stress/strain curve. [especially mild steels]
21, Describe proportionality, yield point, yield point in steels, and the influence of Cottrell atmospheres.
22, Describe Luders lines, [including susceptible materials]
23, Describe what could effect the ductility of a metal including:- composition, grain size, strain hardening, impurities, precipitated particles, atomic structure.

Needless to say, after this the exams were laughably easy!! All i was worried about, was being able to write the answers down quickly enough. The ones where i only got credits, were ones where i had to draw things, as in isometric sketches, and i am CRAP at drawing!!!

Was it a lot of work???? Oh yes, it most certainly was, but it was worth all the work, if only for the reaction obtained from all the detractors that laughed and said i would fail dismally. The college section leader said to them "wait and see" but they laughed themselves silly... Did not laugh when the results came, oh, and i did 4 years worth in one go..

So, get yourself a syllabus, and once you are happy YOURSELF that you have learnt enough, then, i am SURE you will be fine.

One more word of advice.....

My mum was a school teacher for 44 years.. When the kids did the "eleven plus" the ones that came back and said "ha ha that was easy" all failed.....

Now, the ones that, like yourself, doubted themselves, and came back worried, what happened?? generally, they all passed. It takes intelligence to doubt yourself....

Honestly, i really do think that with a bit of effort you will walk it..

Good luck, and I am sure you will surprise yourself!!

[Hasten to add that i could not answer half of them now mind!!!] Mmmmmm, but with a bit of thought.......

john....

 

[Sidewinder]

John,

Those terms take me back a few years!

I went further than the Welding C&G with materials too.

I can't recall Cottrell atmospheres, or Luders lines.

Mind, use it or loose it comes to mind.

I miss welding, especially OA, very theraputic IMHO.

 

[apprentice87]

Ah, "cottrell atmospheres" are to do with the mechanism if the hardening/strengthening of certain materials [mainly steel i think] by means of the following; [if i remember correctly]

A material deforms [elastically] by means of the movement of "dislocations" in the atomic structure permitting movement of atoms along "slip planes" in the material. The theory of "Cottrell atmospheres" was that by introducing an element with atoms so small that they would fit in the "interstitial" spaces between the atoms of the original material, the dislocations would be filled and the atoms jammed, i suppose, into place, thus making the material a lot stronger, or at least raising the yield point. Carbon is a very small atom, and has this effect [amongst others] in steel, as does the smallest atom of the lot, hydrogen, hence the temporary hardening [and consequent lack of ductility and cracking] in the HAZ on welded joints that can occur in the presence of hydrogen during welding. As you know, the gas can actually be observed bubbling out of the solid steel for some time after welding if you submerge it in paraffin or some such..

So far as i can remember Cottrell atmospheres are the mechanism by which "precipition hardening" [as in aluminium alloys] works. If you "over age" them, the atoms of the second constituent "grow" by means of continued precipition, until they "pop out" of the interstitial spaces and form distinct crystals of their own [instead of being in "solid solution"]. When this happens, all the hardening is lost and the only way to get it back is to reheat the metal to take the precipitated second constituent back into solution, and start again.

Luders lines are to do with the peculiar behavior seen in mild steels at the yield point with the sudden stretching without any increase in applied stress. In some steels it was noted that if you stretched them [during pressing operations i presume] that all these funny lines would form. The bands would be the boundaries of bits that HAD yielded and the bits that had not.

Another very interesting thing was "Motts anology of the carpet"!!!!

I did like materials, i must admit!!! was mega interesting!!!!

Yes, i like O/A too! I did some MMA for someone a few months back. Several packs of 4mm 6013's in a series of loads of 2F fillets. They were all about 6" long. I was doing some left to right, and others right to left, just for fun!! It is strangely therapeutic i must agree!!

john...

 

[pewter]

learn GN3   to help with 2394 + 2395

The section on periodic inspection in GN3 is not very big, study those pages as much as the rest of the whole book. Memorise  it exactly.  to help pass 2395

 

[Steve2381]

Thanks for the advice.  I do intend to get my head buried in the books.  Just waiting on the GN8 which should arrive any day now.

Got a good 3 months clear to really learn this stuff anyway

 

[Tradecerts]

I Done the 2391 a few years ago its a hard course so all the best of luck to you

 

[codger]

Hi there. I teach the 2394/5. I have some material you might be able to use.