welder certification

[Rilley Chellah Mulenga]

Good day technical experts,

Can I use a WPS for S355jr thickness of 30mm plate in SMAW to qualify a pipe S355jr 6mm thick in SMAW ? your quick response is highly appreciated  

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RILLEY CHELLAH MULENGA Materials Evaluation Head of Department E: rilley....@ahkgroup.com	www.ahkgroup.com

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[venkateswara reddy Desireddy]

In WPS document qualified material thickness range and P number range available, 

Based on that you can select the WPS.

As per ASME Sec IX you can use plate WPS for pipe. But must be required same P number.

Before using WPS you have to conform all essential variables.

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[Bala Murugan]

Heloo Mr Rilley,

I hope your WPS qualifies as per ISO 15614-1 . Can you clarify if your category is Level1 or Level 2? What about Pipe OD?

No, as per ISO 15614-1, a Welding Procedure Specification (WPS) qualified on S355jr plate with 30mm thickness using SMAW does not qualify you to weld S355jr pipe with 6mm thickness using the same WPS. The essential thickness qualification range for butt welds is based on the thickness of the test piece and differs for plate and pipe, especially when moving from plate to significantly thinner pipe.

Plate-to-Pipe Qualification Limits

• Plate test pieces generally only qualify pipe if the pipe’s outside diameter is greater than 500mm, or if the diameter is more than 150mm and welded in the PA or PC (rotated) position. For smaller pipe diameters or significantly lower wall thickness, separate qualification is required.

• In your specific case (30mm plate → 6mm pipe SMAW, S355jr), you cannot directly use the WPS without further qualification of the pipe if the diameter limitations above are not met.

 Pls find the attached Code extract for your reference.

Thanks & Regards,

Balamurugan

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[Rilley Chellah Mulenga]

Good day Bala,

We are using ASME IX other than ISO 15616-1

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[Rilley Chellah Mulenga]

Goodday  venkateswara ,

The thickness range qualified in the WPS according to ASME IX is 1.5 to 30mm and the P no is 1 because the material is the same S355JR steel 

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[Bala Murugan]

As per Asme section 9, yes you can use that WPS if all the essential variables like p no, f no matches ....you can use that WPS 

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