Argon gas is available in 3 phases.
First phase with 99.97 % purity is said to be commercial quality and used for general applications
and not in TIG / Plasma welding. It is OK for plasma cutting operations. The impurities level in it is
high and may produce porosity and thin & fine slag lines in micron level, which are hardly detectable
through RT, but, felt only through UT.
Second phase with 99.99 % purity level is good for all TIG welding applications ans specially for SS
materials. Provides defect free and radiographic quality welds. .
Third phase with 99.999 % is Ultra high pure (UHP) type and with 'zero' impurities. Good for Urea reactor
welding as well as sensitive jobs including high quality SS welding.
The oxidation level also depends up on ceramic / metallic cup (nozzle used for shielding ) or due to leakages
in the hose, regulators etc. The opening should be generally 3 to 4 times the Tungsten size. As you know
root oxidation is due to the lack of (or) less volume of gas purging during welding SS .
Sridhar.
.
From: smkabeer ahamed <sm_kabeerahamed@yahoo.co.in>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Wednesday, 9 October 2013 9:24 AM
Subject: [MW:18887] Fw: ARGON GAS PURITY LEVEL REG
Dear friends,
stainless steel welding ss304 to ss304 I have used TIG welding at groove
joint.I have used argon gas purity level 99.7 percent instead of
99.99percent .our client suspect weld joint get oxidized.Is this purity
level is accepted as per any code How we will check what percent of
oxidation available in joint.is any testing method is there.how we will
convince our client and get approval from him.kindly suggest as early as
possible
Regards,
S.M.KABEER AHAMED
CHIEF ENGINEER
QUEST INSPECTION AGENCY
BANGALORE-INDIA
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First phase with 99.97 % purity is said to be commercial quality and used for general applications
and not in TIG / Plasma welding. It is OK for plasma cutting operations. The impurities level in it is
high and may produce porosity and thin & fine slag lines in micron level, which are hardly detectable
through RT, but, felt only through UT.
Second phase with 99.99 % purity level is good for all TIG welding applications ans specially for SS
materials. Provides defect free and radiographic quality welds. .
Third phase with 99.999 % is Ultra high pure (UHP) type and with 'zero' impurities. Good for Urea reactor
welding as well as sensitive jobs including high quality SS welding.
The oxidation level also depends up on ceramic / metallic cup (nozzle used for shielding ) or due to leakages
in the hose, regulators etc. The opening should be generally 3 to 4 times the Tungsten size. As you know
root oxidation is due to the lack of (or) less volume of gas purging during welding SS .
Sridhar.
.
From: smkabeer ahamed <sm_kabeerahamed@yahoo.co.in>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Wednesday, 9 October 2013 9:24 AM
Subject: [MW:18887] Fw: ARGON GAS PURITY LEVEL REG
On Tuesday, 8 October 2013 11:51 AM, smkabeer ahamed <sm_kabeerahamed@yahoo.co.in> wrote:
Dear friends,
stainless steel welding ss304 to ss304 I have used TIG welding at groove
joint.I have used argon gas purity level 99.7 percent instead of
99.99percent .our client suspect weld joint get oxidized.Is this purity
level is accepted as per any code How we will check what percent of
oxidation available in joint.is any testing method is there.how we will
convince our client and get approval from him.kindly suggest as early as
possible
Regards,
S.M.KABEER AHAMED
CHIEF ENGINEER
QUEST INSPECTION AGENCY
BANGALORE-INDIA
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
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.
---
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