St.52.3 welded to LTCS piping

[FIF99]

Hi,

Anybody having experience with WPS/PQR's for welding heavy wall piping (NPS 2"-14,2mm) in material equivalent to API 5L-X52 (St-52.3) to material ASTM A333-6 / A420-WPL6 / A350-LF2 Class 1.

Material group as per ASME B31.3 for X52 is S-1 and for A333-6 it is P-1.

Any other issues to take care with other than that of a max. carbon content of 0.23% and CE max. 0.43%?

Thanks for any help.

Regards.
FKE

 

[weldtek]

You say = to, if it is API 5L x52, be aware that there are less stringent requirements for PSL-1 than there are for PSL-2. Eg. if you need impacts, you probably won't want to use PSL-1.
In general though, I wouldn't expect problems welding the two materials as long as you use a low hydro process and apply good practice.

 

[stanweld]

The two materials are readily welded to each other. If impact testing is required at -50 F, manual welds can be made using ER-70S-2 for the root and second pass with E7018-1 for fill and cap. A 200 F minimum preheat should be used. While some will mandate low interpass temperatures, I have never had a problem in over 30 years of welding these materials with interpass temp up to 600F. ASME B31.3 would require PWHT at 1100F min.