welding core plugs

Date 10-16-2008 06:15

are there any special techniques for welding 1 inch thick core plugs in cast steel. the core plug diameters are 2 inches, with a v groove weld prep. They seem to crack in the root when TIG welding due to stress
any help / advice / trick of the trade greatly appreciated
mick

By ravi theCobra (**)

Date 10-16-2008 16:03

are they wrought or cast pieces ?

for some reason on API 610 pumps our suppliers used to insist on cast core plugs -

By mickdale (*)

Date 10-20-2008 06:00

sorry about the delay in replying
they are just turned low carbon steel bar

By ravi theCobra (**)

Date 10-20-2008 19:08

my experience has been to use the same   material as the casting   ( A 216   Gr WCB or Grade WCC ).

I think that you are in for trouble if you weld a forged steel bar to   a casting as one has a cast structure   and the other

piece is a forging - My work was on API   610   pumps   which   were for flamables in a refinery -

By DaveBoyer (*****)

Date 10-21-2008 02:39

I would not expect the difference in microstructure between cast steel and wrought steel to be the problem, a weld deposit is a cast microstructure. Alloying elements I think would be the main issues.