API 5L series Pipe & its welding rods inquiry

[PARAI Reaction Channel]

Dear Sirs,

Good day.

As per API 1104, we are going to run PQRs soon;

So, Please give your suggestion and comments for welding the following API 5L series of pipes with the selected Class of welding rods & Fillers :

First, let me know if the selected AWS class are OK to proceed or not ?

1) API 5L Gr. X42 : GTAW : AWS Class 5.18 ER70S-6 + FCAW : AWS 5.20 E71T-1C

2) API 5L Gr. X65 : GTAW : AWS 5.28 ER80S-Ni1 + SMAW : AWS 5.5 E8018-C3  

3) API 5L X70 : GT : AWS 5.28 ER80S-Ni1 + SMAW : AWS 5.5 E9018M (OR)

FCAW : AWS 5.29 E91T1-K2C 

Also recommend me for welding parameters such as Amps, Volts, Gases, Preheat, Post Heat, Interpass Temps with site links to make these PQRs successful.

Best Regards,

Saravanan Sornam,

Ansan-Si,

S.Korea

[sridhar cn]

Mr. SS,

You have not indicated the parent metal thicknesses to recommend the consumable sizes. For a lower thickness pre & post heating is not

required. Towards welding parameters such as amps, volts, gases,  please refer to the technical literature obtained from the manufacturers

of the consumables.

CS

On Thu, 16 Jul 2026 at 22:37, sridhar cn <sridha...@gmail.com> wrote:

Dear Mr SS,

Your proposed consumables are generally in the right direction, but there are a few points worth correcting and verifying, 

particularly with respect to strength matching and low-temperature toughness. 

My comments as follows:

1. API 5L X42: “GTAW” AWS A5.18 70S-6 + “SMAW” E7018 (or) “FCAW” AWS 5.20 E71T-1C is suitable. 

                         If Ar/CO₂ gas is used  E71T-1M is better.

2. API 5L X65: “GTAW” ER80S-Ni1 + “SMAW” E8018-C3 is a proven combination. For FCAW, use E81T1-Ni1C (or) E81T1-K2C.

3. API 5L X70: “GTAW” AWS A 5.28 ER80S-Ni1 + “SMAW” E9018M is the preferred electrode (or) “FCAW” E91T1-K2C is an 

                         excellent choice.

ER80S-Ni1 is commonly used for the GTAW root pass because the weld metal is diluted by the X70 base metal and the subsequent 

fill passes achieve the required overall strength. However, if a correct matching strength is required, an ER90S-Ni1 class filler is a 

better choice in place of ER80S-Ni1 and may be specified instead.

C Sridhar.

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[sridhar cn]

Dear Mr SS,

Your proposed consumables are generally in the right direction, but there are a few points worth correcting and verifying, 

particularly with respect to strength matching and low-temperature toughness. 

My comments as follows:

1. API 5L X42: “GTAW” AWS A5.18 70S-6 + “SMAW” E7018 (or) “FCAW” AWS 5.20 E71T-1C is suitable. 

                         If Ar/CO₂ gas is used  E71T-1M is better.

2. API 5L X65: “GTAW” ER80S-Ni1 + “SMAW” E8018-C3 is a proven combination. For FCAW, use E81T1-Ni1C (or) E81T1-K2C.

3. API 5L X70: “GTAW” AWS A 5.28 ER80S-Ni1 + “SMAW” E9018M is the preferred electrode (or) “FCAW” E91T1-K2C is an 

                         excellent choice.

ER80S-Ni1 is commonly used for the GTAW root pass because the weld metal is diluted by the X70 base metal and the subsequent 

fill passes achieve the required overall strength. However, if a correct matching strength is required, an ER90S-Ni1 class filler is a 

better choice in place of ER80S-Ni1 and may be specified instead.

C Sridhar.

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On Tue, 14 Jul 2026 at 19:15, PARAI Reaction Channel <sarava...@gmail.com> wrote: