treatment of distension - how to verify it

[MBT]

Good morning to all
problems of August, so much with this time surely you are not under the umbrella....
Suppose we have a medium-sized carpentry with welding and processing
a design is indicated the treatment of distension.
the supplier, of course, will supply me with certificates that guarantee me that this distension has been carried out.
But... I'm a candalostie I don't trust! If I wanted to make sure that the distension was actually done as a rule of art, what kind of test can I do?
and if the distension was done by vibration, do there exist controls?

thanks for suggestions

 

[cacciatorino]

Good morning to all
problems of August, so much with this time surely you are not under the umbrella....
Suppose we have a medium-sized carpentry with welding and processing
a design is indicated the treatment of distension.
the supplier, of course, will supply me with certificates that guarantee me that this distension has been carried out.
But... I'm a candalostie I don't trust! If I wanted to make sure that the distension was actually done as a rule of art, what kind of test can I do?
and if the distension was done by vibration, do there exist controls?

thanks for suggestions

I don't know how to respond to the specific point, but if you start with this approach then you should check all the technological process that has led you to the manufacture, from steel castings to the intake material for welding etc. etc.. sure you want to do it?

 

[MBT]

I don't know how to respond to the specific point, but if you start with this approach then you should check all the technological process that has led you to the manufacture, from steel castings to the intake material for welding etc. etc.. sure you want to do it?

we say I do it to seen ragion and as "special case"
Let's say, without going into the specific, that I found suspicion that a piece was laid out in the sense that they laid it on a flat surface and to take away the stress must have lost it of chamomile or sung a dwarf-nanna....
However, before moving a serious "j'accuse", I would like to have concrete evidence.

 

[Fulvio Romano]

I guess you also want non-destructive control, don't you?

If you do a high-resolution 3d scan, then do a set of holes and do the same scan to verify the deformations?

I don't know, I said nonsense. .

 

[MBT]

I guess you also want non-destructive control, don't you?

If you do a high-resolution 3d scan, then do a set of holes and do the same scan to verify the deformations?

I don't know, I said nonsense. .

control should be nondestructive.
Let's put it like this...
Suppose you have a piece, which has deformed. you suspect it wasn't lying, or at least not properly
The supplier shows you a certificate, but your 5th and a half way tells you that that certificate is worth the toilet paper used... .
do you have a way to prove that distension was not done properly?

 

[Gioan]

very interesting question,
I do not have the answer, but if the metal has undergone a heat treatment like that for the distension (about 600-650°c) it can be seen to the eye on the surface, always that the artifact is not all worked of milling or all painted or sandblasted (there are always internal areas that are not reached by sandblasting or spray painting and can be controlled with a mirror).
know then if the thermal cycle has been executed as a rule of art with the correct times of heating-maintenance-raffredd. I don't know exactly, even at me it would be very useful (always it is not a destructive or too expensive control). Hi.

 

[MBT]

bhe, the piece was sanded, workers and painted. You should see inside to understand something. However, if the treatment has been done with vibrations, it does not leave visible traces to the naked eye.

 

[cacciatorino]

control should be nondestructive.
Let's put it like this...
Suppose you have a piece, which has deformed. you suspect it wasn't lying, or at least not properly
The supplier shows you a certificate, but your 5th and a half way tells you that that certificate is worth the toilet paper used... .
do you have a way to prove that distension was not done properly?

I think it's a very difficult thing, I found a wiki page where you list non-destructive techniques for finding residual tensions, but it doesn't seem like stuff within the reach of any business lab.
http://en.wikipedia.org/wiki/residual_stress#non-destructive_techniques

 

[Gioan]

Hi.
Since I was very interested in the matter, I wanted to ask mbt if he had solved by finding a simple method (as well as those we had hypothesized in the discussion) to verify the execution of the distension.
Thank you.

 

[MBT]

Hi.
Since I was very interested in the matter, I wanted to ask mbt if he had solved by finding a simple method (as well as those we had hypothesized in the discussion) to verify the execution of the distension.
Thank you.

Hi.
mah, things from me are a more complicated hair of the expos, because of other factors. . .
However, by doing some interviews around, I found a branch in Italy of an English company that is equipped for these types of checks, at costs that seem entirely acceptable.
not having tried it yet, I do not feel like talking about its effectiveness.

 

[Gioan]

Thanks for the mbt answer.
if you carry out these checks we wait for your considerations.
Thank you.