Fw: ARGON GAS PURITY LEVEL REG

[smkabeer ahamed]

On Tuesday, 8 October 2013 11:51 AM, smkabeer ahamed <sm_kabe...@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

[mohd]

dear ahmed,

As per ISO 14175 - I1
Minimum 99.998% purity level argon Suitable for all TIG welding and purging applications on all thickness.
anyway client is right.

your case is weak but still if you can convinced through any demistration by test piece with both purity and compare the result.

regards,
mohd.

[shaikh ahmed]

Dear Brother , Check the % of Oxygen during Purging by OXYGEN MONITOR INSTRUMENT AVAILABLE.

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[Mohanananthanarayanan KR]

Dear sri. Kabeer,

You can check with IOL wherein Argon is graded as I,II etc. IOLAR Grade 2 is used for pressure vessel application. A certificate to this effect with chemistry basically moisture content would be given IOLAR on demand.

Regards

Mohan Ananthanarayanan
DGM Qulaity ISRO



On Wed, 9 Oct 2013 11:54:42 +0800 (SGT), smkabeer ahamed wrote

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[c sridhar]

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_kabe...@yahoo.co.in>
To: "material...@googlegroups.com" <material...@googlegroups.com>
Sent: Wednesday, 9 October 2013 9:24 AM
Subject: [MW:18887] Fw: ARGON GAS PURITY LEVEL REG

[Sam]

dear ahmed,

please clarify where u used 99.7. for shielding or purging ?

i think for shielding we must use 99.99 but for purging/backing we may use 99.7.

please correct if i am wrong.

regards,

[sevak hiren]

Dear Friend,

 

Kindly find my reply as under.

There are three points.

1)    As per ASME section IX, there is no must requirement to mention purity level of shielding Gas. (Judgment based on official ASME interpretation.)

2)    As per ASME Section IIC, SFA 5.32 – Pure argon must be of purity level of 99.99.

3)     Argon up to 99 % purity level may work well, because only 1% or more oxygen can cause weld bead defects. (Judgment based on reading from AWS code D 10.4.)

Conclusion:  For safer practice & considering point no.2, Argon with purity level 99.99 is recommmended.

 

Regards

Hiren Sevak

[james gerald]

I read some article very long back on AWS Journal which gives details about the purity levels which I am unable to track. Probably someone can help you.

 

According to ASME Sec.IIC, SFA 5.32 - Argon purity level is 99.997% which is the same mentioned in the AWS article and the impurity level controlled upto 30 ppm.

 

 

 

Thanks & Regards

J.Gerald Jayakumar
00974-55836810

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[kannayeram gnanapandithan]

Argon purity level

1. Reactive metals----------99.997%

2. Otherthan reactive metal---99.95%

[james gerald]

There are some discoloration chart available with  Client specification like Shell etc.. which can be used to demonstrate the Level of oxidation on the Root side.

 

Thanks & Regards

J.Gerald Jayakumar
00974-55835810

 

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