Hi,
Hardness testing (thorough thickness or surface hardness using protable hardness tester) on production welds is not geenrally performed, however if requested by Client (usually for hot formed bends, Sour Service and PWHTed components) has to be performed using an approved Hardness tester.
Leeb type hardness tester are most popular but restricted by some Clients, Ultrasonic contact impedance testers in accordance wih ASTM A1038 are acceptable by all.
Surface hardness testing is reliable because outside surface cools fastest and subsurface cools slower therefore outside surface ending up with higher hardness.
Conventional hardness testing (Mechanical) is a usual way to qualify Welding procedure and nobody is going to perform mechanical tests on production welds.
Regards,
Manpreet Singh
On Sun, 17 Jun 2012 10:22:45 +0530 wrote
>Dear Experts,
What is the working principle of Electronic Portable Hardness Tester ?
Is it really reliable to measure final weld hardness test using Electronic Portable Hardness Tester (For Example Hardness test of all weld of a fabricated equipment at fabrication shop) ?
What is the major technical difference between conventional (Mechanical) Hardness Testing machine to find out the correctness of Hardness by using electronic hardness tester.
--
>
To post to this group, send email to materials-welding@googlegroups.com
>
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
>
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
>
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Hardness testing (thorough thickness or surface hardness using protable hardness tester) on production welds is not geenrally performed, however if requested by Client (usually for hot formed bends, Sour Service and PWHTed components) has to be performed using an approved Hardness tester.
Leeb type hardness tester are most popular but restricted by some Clients, Ultrasonic contact impedance testers in accordance wih ASTM A1038 are acceptable by all.
Surface hardness testing is reliable because outside surface cools fastest and subsurface cools slower therefore outside surface ending up with higher hardness.
Conventional hardness testing (Mechanical) is a usual way to qualify Welding procedure and nobody is going to perform mechanical tests on production welds.
Regards,
Manpreet Singh
On Sun, 17 Jun 2012 10:22:45 +0530 wrote
>Dear Experts,
What is the working principle of Electronic Portable Hardness Tester ?
Is it really reliable to measure final weld hardness test using Electronic Portable Hardness Tester (For Example Hardness test of all weld of a fabricated equipment at fabrication shop) ?
What is the major technical difference between conventional (Mechanical) Hardness Testing machine to find out the correctness of Hardness by using electronic hardness tester.
--
>
To post to this group, send email to materials-welding@googlegroups.com
>
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
>
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
>
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>
 |
| Follow Rediff Deal ho jaye! to get exciting offers in your city everyday. |
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Comments