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 -

348 views
Technical Discussions
Tim Milligan
Tim Milligan
05:31 Aug-30-2004
Helium leak testing

Can anyone settle an argument regarding helium leak testing? We regularly weld titanium parts and duplex parts. NDT is usually by means of dye pen and helium leak test (low pressure, wiith vacuum on one side of the weld and helium on the other).
Is the helium test invalidated if the dye pen is applied before carrying out the leak test?


    
 
 
Jim Knowles
Jim Knowles
09:02 Aug-31-2004
Re: Helium leak testing
----------- Start Original Message -----------
: Can anyone settle an argument regarding helium leak testing? We regularly weld titanium parts and duplex parts. NDT is usually by means of dye pen and helium leak test (low pressure, wiith vacuum on one side of the weld and helium on the other).
: Is the helium test invalidated if the dye pen is applied before carrying out the leak test?
------------ End Original Message ------------

Essentialy, Yes, the reason is that when Helium testing like what is described, the penetrant liquid is viscous material and would block any small leak path to the detector. It is required that the part is Helium tested before PT, or the part can be vacuum degassed after PT, usually at an elevated temprature to aid in the boil off of the penetrant.



    
 
 

Product Spotlight

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

PROlineTOP Plug & Play Ultrasonic inspection device

As Plug & Play solution it units all control and operation elements in a small housing and therefo
...
re replaces the typical control cabinet...
>

Magnetic X-Ray Pipeline Crawler

Zhong Yi brand pipeline crawler is magnetic/micro-video controlled crawler with DC X ray unit inst
...
alled for checking welding of pipeline. Move steadily inside the pipeline 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometers and provide the efficient inspection of the pipeline.
>

EKOSCAN Phased Array

In order to always fit your needs, EKOSCAN can manufacture any type of UT transducer, either convent
...
ional or Phased Array. As an ISO 9001: 2015 certified company, EKOSCAN is extremely careful as far a material selection and manufacturing processes are concerned. Our probes guarantee our customers the benefits of latest innovations regarding piezo-composite, backing, impedance adaptation layer, etc. Specific probes for hostile environment: high temperature, high pressure, corrosive environment,etc. Specific probes designed to fit your specific application: optimization of every parameter to guarantee you the best detection.
>

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