Welding Electrode Stainless steel to alloy steel

[Tomy-Met]

Welding Experts Please advise the filler wire & electrode for weld joint between alloy steel pipe SA335P22 & Stainless steel pipe SA312TP321H?

 

[weldstan]

Too vague a question. What are the oper[pre][/pre]ating conditions, temp. PWHT, fluid service, thermal cycling?

 

[Tomy-Met]

Weldstan thanks for your response.
Service is steam with thermal cycling as this is cold reheat line.
Operating Pressure: 49bar
Operating temprature: 510C

PWHT shall be eliminated and temper bead welding shall be done.

 

You were out of your depth with the first question; with temper bead welding you confirmed you are now way out of your depth.
Consult a welding engineer familiar with the application.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[EdStainless]

Getting good creep resistance is a P22 to 321H weld takes work. There are research articles about this.
Hire someone who has done it.

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P.E. Metallurgy, consulting work welcomed

 

[weldstan]

If you have access to EPRI publications, search there. I have read many similar artiicles but am too long retired to search an I no longe have access to their publications. I believe that you will need a transition material pup between the two to get best service life.