interpration

[Kannayeram Gnanapandithan]

  Interpretation #: BPV IX-18-34

 Record Number: 18-771

 Subject Description: SC IX; QW-401.1 and QW-403.6 - Thickness Range Qualified for Impact Testing Standard Designation: BPV Section IX Par/Fig/Table: QW-401.1 and QW-403.6 Edition/ Addenda: 2017 

Background:

 A welding procedure qualification was performed on a 40 mm thick test coupon in 1G position by GTAW (10 mm) and SMAW (30 mm). Tension and bend tests were performed on the 40 mm plate. 

A second welding procedure qualification was performed on a 6 mm plate in 3G position by GTAW and only impact testing was performed. A third welding procedure qualification was performed on a 6 mm plate in 3G position by SMAW and only impact testing was performed. All of the essential variables remained the same except for the coupon thickness. 

Question: 

May the PQRs listed above, support a WPS (GTAW+SMAW) for material requiring notch toughness with a qualified base material thickness range of 5 mm to 200 mm, GTAW weld metal thickness range 20 mm max. and SMAW weld metal thickness range up to 200 mm max.? 

Reply: Yes.   

 My queries .   Is it in order

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015, ISO 3834, EN 15085, 

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

[Zakaria ghrab]

Hi experts,

I'm need information about 347H material weldability ( welding process, rod/electrode, temperature control, pwht, impact test?!, ....)

Could you help me with references please.

Thank you very much.

Thanks and Regards, 

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زكرياء غراب
GHRAB Zakaria 

Tunisia : +216 96 635 805

Bénin : +229 97 128 387

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[sridhar cn]

Base metal thickness (impact-qualified) you have now: from 6 mm PQRs - 3 mm to 12 mm.

1. GTAW weld-metal thickness (impact-qualified) you have now: GTAW from the 6 mm coupon (practically ≤12 mm 

    unless the PQR deposited 10+ mm).

2. SMAW weld-metal thickness (impact-qualified) you have now: SMAW from the 6 mm coupon (again, small, not 

    anywhere near 200 mm).

3. What you do not have: any impact-tested PQR that can justify base thickness up to 200 mm or GTAW weld metal 

    20 mm /SMAW weld metal 200 mm for an impact-required WPS. The 40 mm non-impact PQR cannot be used to 

    fill that gap.

 

What you need to do to reach the ranges you want:

To qualify the base thickness up to 200 mm for impact toughness

1. Obtain a PQR with impact testing on a coupon T ≥ 100 mm (As most rules let you qualify up to 2T). If you take 

    T -100 mm and do impact tests according to the spec, you can qualify up to 200 mm (subject to other code 

    requirements). Alternatively, follow the exact QW-403.6 limits for your material and code application - but in practice, 

    you’ll need a much thicker impact PQR coupon than 6 mm.

2. To qualify, GTAW weld-metal 20 mm make sure the GTAW deposit thickness t in the impact PQR is ≥ 10 mm 

    (so 2t ≥ 20 mm). Run a GTAW impact PQR coupon with sufficient deposited weld metal. 

 

3. To qualify SMAW weld-metal 200 mm; that’s enormous - to get 2t -200 mm, you’d need t -100 mm of deposited weld 

    metal in the coupon (impractical). 200 mm is typically achieved only by a very large coupon and is not a practical 

    weld-metal deposit on a lab coupon.  .

 

C Sridhar.

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[Rajnish Dixit]

Hi Zakaria,

Hope it is piping material and generally we use GTAW + SMAW welding processes to weld such stabilized grade material.

For SS347H material, the recommended welding consumables are AWS ER347 for Gas Tungsten Arc Welding (GTAW) and AWS E347 for Shielded Metal Arc Welding (SMAW).

Please check your customer's specifications for PWHT and other requirements. Being stabilized grade PWHT is recommended at 900 deg. cent. temperature for 4 hours.

Thanks,

Best Regards,

Rajnish 

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[Kannayeram Gnanapandithan]

used in high temp superheater coils. No welding issues. may not get matching wire like ER 347H,E347H, instead u can use 347

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015, ISO 3834, EN 15085, 

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

To view this discussion visit https://groups.google.com/d/msgid/materials-welding/1091900790.162442.1761312265505%40mail.yahoo.com.

[Vishwas Keskar]

What is service temperature of the equipment ?

If Ferrite number is to be controlled,  then TYP 16-8-2 filler metal is required as it has very low FN .

Check with designer/ Specs/ service experience 

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