where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
994 views
Technical Discussions
Ron Olson
R & D, Aviation
The Best Aviation Company In The World, USA, Joined Feb 2005, 23

Ron Olson

R & D, Aviation
The Best Aviation Company In The World,
USA,
Joined Feb 2005
23
04:52 Sep-29-2005
Metals and Conductivity

Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.


    
 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 521

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
521
00:42 Oct-01-2005
Re: Metals and Conductivity
Simple answer: No
Typically Aluminium Alloys cover quite a range of conductivity depending on Heat treatment state.

The relationship between heat treatment and conductivity is complex: Many alloys (e.g. the common 7075 type) follow a circular curve with heat treatment/work - Even knowing the alloy composition you cannot reliably tell the full state from conductivity - often need hardness as well.

What you can do is use conductivity as a check- If an alloy has the conductivity you expect it is 'likely to be correct', or more precisely, if it is different something is wrong, but you cant work back to deduce much, with a high degree of certainty, if you only know conductivity.

If you can make a few more assumptions it becomes a lot more useful. Typically a shop may only work with a few different alloys, so conductivity can be used to check which one you have.

If you 'know nothing' you need hardness and PMI checks as well

Joe


----------- Start Original Message -----------
: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
------------ End Original Message ------------




    
 
 Reply 
 
Carl Berrojo
Carl Berrojo
05:32 Oct-02-2005
Re: Metals and Conductivity
----------- Start Original Message -----------
: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
------------ End Original Message ------------
No, due to the overlapping conductivity values of aluminum alloys (ie. 2024-T3 is 28%-32% IACS and 7075-T6 is 30%-35% IACS). Normally, you would identify the alloy with acid testing (we use kits provided for this purpose by Scientific Systems Laboratories), then use the conductivity value to determine the temper (heat treat condition).





    
 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
02:13 Oct-02-2005
Re: Metals and Conductivity
Dear Ron,

No. The conductivity is just one of several parameters. You will need a spectro or XRF spot analysis, if you don't want to cut a piece and send it for conventional chemical analysis. Strength and hardness data will tell you about heat treatment.

Swamy

----------- Start Original Message -----------
: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
------------ End Original Message ------------




    
 
 Reply 
 

Product Spotlight

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

Conformable wedge transducer

The conformability is obtained with a flexible membrane filled with water between the transducer and
...
the inspected component. The coupling between the membrane and the component requires a small quantity of water or couplant. The conformable wedge combines the acoustic performance of immersion technique with good coupling and low attenuation.
>

TESTD-PT SYSTEM

Pulse thermography is a non-contact test method that is ideal for the characterization of thin fil
...
ms and coatings or the detection of defects. With a remarquable short test time and a high detection sensitivity, the Telops TESTD-PT is the perfect tool for non- destructive testing. With such high frame rates, it is even possible to investigate highly conductive or diffusive materials.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window