Dear all,
When using Arcmet its vital to get 99.9% pure argon gas plus ensuring that the surface is grinded and polished. Here is an excerpt from TCR's procedure for Arcmet operations in terms of pre-requisites:
The component subjected to the test shall have a flat surface area of approximately about 20 x 20mm square and the same shall be finished with a 60 grit abrasive paper using either a portable grinder or a polishing machine. The metallic surface to be tested shall be free from all extraneous materials such as scale, grease, rust, dirt, etc. which may interfere with the testing. ArcMet cannot be used for smaller size pipes and fittings. Its best performance is for larger than 50 NB size. For optical emissions based PMI, the technician will need Instrument Grade Argon of 99.999% purity argon gas as well available at site. Input of 230 Volt AC is required.
When using Arcmet its vital to get 99.9% pure argon gas plus ensuring that the surface is grinded and polished. Here is an excerpt from TCR's procedure for Arcmet operations in terms of pre-requisites:
The component subjected to the test shall have a flat surface area of approximately about 20 x 20mm square and the same shall be finished with a 60 grit abrasive paper using either a portable grinder or a polishing machine. The metallic surface to be tested shall be free from all extraneous materials such as scale, grease, rust, dirt, etc. which may interfere with the testing. ArcMet cannot be used for smaller size pipes and fittings. Its best performance is for larger than 50 NB size. For optical emissions based PMI, the technician will need Instrument Grade Argon of 99.999% purity argon gas as well available at site. Input of 230 Volt AC is required.
We do PMI with both XRF as well as portable OES (such as an Arcmet) in Saudi Arabia, Kuwait and in India.
Regards
Rohit Bafna
TCR Engineering
On Mon, Mar 24, 2008 at 12:09 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:
you can try ultrahigh pure from the following range, research purity
may not be avaialble offthe shelf
RESEARCH PURITY 99.9999%
ULTRA HIGH PURE 99.999%
PRE-PURIFIED 99.998%
ZERO GAS 99.998%
HIGH PURITY 99.995%
also surface cleaning of the conatcat area importatnt, consult your
analyser supplier for further help!
On Mar 24, 3:35 pm, shailesh dave <snd2...@yahoo.com> wrote:
DEAR Mr. RAGHURAM,
BUT SPARK EMISSION WHAT WE ARE ADOPTING HERE IS ARGON BASED AND MANY
TIMES I FOUND PURITY OF ARGON IS NOT ENSURED. HENCE I AM RELUCANT TO
GO FOR SPARK EMISSION FOR PMI OF LOW CARBON SS.
YOUR VIEWS PLEASE.
REGARDS,
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