Hot cracking in welding I-718 castings

[weldengineer]

Could anyone recommened a proven set of parameters (GTAW) to prevent hot cracking when welding I-718 alloy castings? We have experimented with pulse vs. straight polarity and used lower amperage and lower interpass tempuratures. The castings are in the homogenized condition prior to weld so they are in the best possible condition. Any further recommendations?

 

[JimMetalsCeramics]

Useful links:

http://klabs.org/DEI/References/design_guidelines/design_series/1205msfc.pdf

http://www.aws.org/cgi-bin/mwf/topic_show.pl?id=413

http://cla.utsi.edu/html/people/mmccay/index.htm

 

[spengo]

Does the information on page 6 of this link help?

http://www.msm.cam.ac.uk/phase-trans/2002/papers/APNickelWeldv2.pdf