Re: [MW:27623] USE OF WPS

Hi 

I would like to add some points in addition to above . Ex for SMAW as per ASME Sec IX

 

1.    Change in electrode diameter for WPS/PQR is considered as a Non-essential variable as per ASME Sec IX- QW 404.6 ( 2017 edition) for Electrode Diameter up to 6 mm

 

2.    Change in electrode diameter for WPS/PQR is considered as a Supplementary essential variable as per ASME Sec IX- QW 404.7 ( 2017 edition) for Electrode Diameter greater than 6 mm

 

In your case change in diameter is within 6 mm, so you can use 4 mm diameter by revising your WPS for approval just in case.

 

 ( copied from 2010 edition for understanding purpose )

 

Also note, You may consider/ verify the below point if applicable

 

In some cases Client provide restriction on the maximum allowable  electrode sizes along with position during fabrication.  ex for SMAW Low hydrogen electrodes 5 mm for the 1G/1F position & 4 mm for all other positions.

 

The ability of each welder to use the maximum sizes listed in your WPS table shall be checked by the Inspector as early as possible during fabrication.

 

Even though code allows, For applications requiring heat input restrictions based on service requirements (e.g., applications with Charpy impact testing, weld overlays), the heat input to be recorded against each size of electrode and used as the limiting value for the WPS i.e. The minimum heat input used in production shall be no less than the minimum used in the qualification.

On Wed, Apr 4, 2018 at 4:33 AM, Venkadesh Lakshmanan <venkadeshmech@gmail.com> wrote:

Change in electrode dia is a non-essential variable for normal service. If so, it can be used. But it considered as supplementary essential variable, where notch toughness required in changing of electrode size >6mm.

Regards, 

LV

On Apr 1, 2018 9:17 PM, "Nachhattar Singh" <nachhattar1947@gmail.com> wrote:

Dear Experts

 

I have a WPS and PQR approved for 13% Cr. For 3.2 mm Electrode.

My question is if the same WPS can be used for use of 4.0 mm electrode.

 

If yes, then please give reference of the code / standard.

 

Kind regards  

 

N. S. Gurm

 

PLEASE THINK BEFORE PRINTING

 

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