WPS & PQR for overlay (hard-facing) on solid shaft

Dear Mr. ND,

Please refer your queries regarding WPS for overlay:

What should I mention in WPS in base metal thickness range ?

Nominal base mental thickness qualified (T) should be 1 inch to unlimited

Also, for filler metal what should I mention weld overlay thickness range and thickness range ?

U have not mentioned the size of the electrode, no of layers to be welded and post machining requirements and surface hardness required (taking dilution factors also into consideration) etc.

Assuming, U are using 3.20 (or) 4.00 mm size to give 2 (or) 1 layers and final finishing to get req. 2.00 mm final hardened layer , the thickness in the WPS could be mentioned as follows:

1. For conducting final hardness test on as welded surface, the distance from app. Fusion line (at the root side) to the final as welded surface shall become the minimum qualified overlay thickness.

2. For conducting final hardness test if the material is removed from as welded surface, the distance from app. Fusion line ( at the root side) to the final prepared surface shall become the minimum qualified overlay thickness.

Any other point where WPS for overlaying is different then normal groove welds ?

Yes. Overlaying is different with lesser details compared to WPS for normal groove joint.

I would appreciate if somebody is having some sample WPS & PQR regarding this which will help me.

If possible I will enclose the same to you at the earliest.

regards,

SRIDHAR,

Advance inst. of welding technology-Chennai -India.

Dear Mr. Sridhar,

Thank you very much for your reply and your valuable inputs.

The technical inputs you have shared here were of great help to me.

Thanks and regards,

ND

The answers to all of you questions are given in ASME Code Section IX 2007