Welding Stainless Casting 2

[PAN]

We would like to weld JIS SCH13 (Equivalent to ASTM A297 HH). I understand ther AWS A5.4 E309-16 can be used. There will not be preheat or PWHT. Maximum interpass temperature will be 150 C.

Please comment about this consept. Should we have any precaution for this work?

 

[metengr]

PAN;
The only change that I would suggest is using an SFA 5.4 E310Cb weld rod for this application. The E310 Cb is a columbium stablized grade, and is commonly used to weld repair heat resisitant castings. In addition, I would suggest performing a post weld NDT like Liquid Penetrant to assure weld depsoit and surrounding and base metal integrity.

 

[PAN]

metengr,
Thanks for the comment. Could you please advise me about the reason to recommend E310Cb instead of E309Cb?

 

[metengr]

PAN;
The E309 Cb has the following alloy content regarding Cr and Ni;

22%-24% Cr, with 12%-16% Ni + Cb

The E310 Cb has the following alloy content regarding Cr and Ni;

24%-26% Cr, with 19%-22% Ni + Cb.

Typically, I like to use slightly over-matching alloy filler metal for elevated temperature oxidation resistance and creep strength when weld repairing HX series heat resistant stainless steel castings. You certainly can use the E309 Cb, I would not use E309-16.

 

[unclesyd]

All the Hx alloys have behaviour problems when welding. It takes welder a little while to get use to material.
I would let each welder have a try on a scrap piece.

We have found several things in welding Hx materials that help a lot.
Use a welder that you consider a good stick SS person.
Use a short arc welder. This is to help with the tendency of some castings to "fall away in the arc".
Watch the angle of the elctrode, don't let it get too flat.
Watch the dwell time on the walls. Most of these alloys are hot short.

Don't get too far into your welding without do some testing.