ER 70S-2 in pipeline root welding as per API 1104

[K.M Hrishikesan]

Hi

One of our contractors wants to qualify a PQR using root with ER 70S-2 and subsequently with E 8010-1. I have never come across root being welded with GTAW in pipeline. Can any one comment please..??

Regards

Hrishikesan 

[ARORA Rajeev]

Can be .. we are using in sour services pipeline to reduce root repair 

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[Lakshman]

Hi
What is the base material, size and groove ?

 

Technically Nothing wrong in using GTAW with ER70S-2.

Pls do proper PQR, in one of the project I used GTAW for root

All the best

 

Thanks & Regards,

Lakshman Kumar.

+91 9440031459

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[K.M Hrishikesan]

Thanks Mr Lakshman...Base material is API 5L X70. Thickness 24 mm, single V groove. Could you please  share the WPS of the project you mentioned?

Thanks..

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[ARORA Rajeev]

This pipeline is sour or nonsour service?

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[K.M Hrishikesan]

Thanks Mr Rajiv.. Could you please  share the WPS relevant pages?

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[Kannayeram Gnanapandithan]

ER 70S3 is the best for pipeline 

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[K.M Hrishikesan]

It's non sour.

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[Amol Betkar]

Dear,

In accordance with API 1104, the standard for welding of pipelines and related facilities, the root pass welding for pipelines is typically performed using Shielded Metal Arc Welding (SMAW), also known as manual metal arc welding or stick welding. Gas Tungsten Arc Welding (GTAW), commonly referred to as Tungsten Inert Gas (TIG) welding, is not typically recommended for root passes in pipeline welding according to API 1104.

While API 1104 doesn't explicitly prohibit the use of GTAW for root pass welding, it emphasizes SMAW as the primary method for root pass welding due to its suitability for pipeline welding applications. ER 70S-2 filler material is more commonly associated with Gas Metal Arc Welding (GMAW) or MIG welding, rather than SMAW or GTAW, and may not provide the desired properties for root pass welding in pipeline applications.

For subsequent passes after the root, API 1104 often recommends the use of specific filler materials such as E 8010-1, which is designed for pipeline welding applications. This electrode is commonly used for root and hot pass welding in pipeline construction due to its ability to provide deep penetration and excellent mechanical properties.

In summary, while GTAW may not be explicitly prohibited by API 1104, SMAW using appropriate filler materials such as E 8010-1 is generally the preferred method for root pass welding in pipeline construction, ensuring compliance with industry standards and specifications.

Regards,

Amol K.Betkar

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Best regards,

Amol K.B

B.E(Mech), CSWIP 3.2.2, NACE CIP 1 & ASNT LII(4M)

[K.M Hrishikesan]

Dear Mr Amol

Could you please quote the specific reference from API 1104 that prohibits GTAW for root welding?

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[Muhammad Asif]

Dear Mr. Amol, 

Can you please share the specific clause which states that we can not use GTAW in pipelines?

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[Amol Betkar]

Dear,

API 1104, "Welding of Pipelines and Related Facilities," does not specifically prohibit Gas Tungsten Arc Welding (GTAW) for root welding. The choice of welding process for root pass welding is typically governed by the specific project requirements, welding procedure specifications (WPS), and applicable industry standards and codes.

However, API 1104 does provide guidelines and requirements for the welding process, including the root pass, such as ensuring proper penetration, fusion, and alignment. It also outlines acceptance criteria for welds, including visual inspection and non-destructive testing (NDT) methods. So, while it doesn't specifically prohibit GTAW, it sets standards for the quality and integrity of welds regardless of the welding process used.

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[Vinay]

We Have done    GTAW with ER70S-2

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