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
On Wed, Oct 9, 2013 at 9:24 AM, smkabeer ahamed <sm_kabeerahamed@yahoo.co.in> wrote:
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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
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