Crack issue in hastalloy22

[Neilash Kumar]

Dear Experts,                  

During  cladding using  Hasteloy C22 consumable  on reaction chamber roll with base material 1.4776/ 30%CrMo steel 

we immediately noticed during a small test clad, cracks (a lot). as per picture 

Pls advise me what we could do to avoid cracks?

Best Regards 

Neilashkumar P 

Sent from Yahoo Mail on Android

[Ramon Briceno]

Dear Neilash, 

What happens is that you must maintain a constant preheating of the base metal side, during the application of the Hastelloy C22 cladding. 

Why ?: The 1.4776 base material has a high carbon content (0.30 to 0.45%) and a high Cr content (about 30%), it is a high temperature resistant stainless steel.  And C22 is high alloy too. A little difficult to welding.

To avoid those hot cracks from the cladding, preheat to 350 °F on the opposite side of the base metal, approximately for the duration of the weld. Then, immediately, cover the piece with mineral wool and let it cool slowly, slowly, to room temperature. Do the corresponding NDTs again. And evaluate.

Luck! 

Ramon Briceno

linkedin.com/in/ramonbriceno-metalengineer

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De: 'Neilash Kumar' via Materials & Welding <material...@googlegroups.com>
Enviado: miércoles, 10 de noviembre de 2021 11:19 p. m.
Para: material...@googlegroups.com <material...@googlegroups.com>
Asunto: [MW:32601] Crack issue in hastalloy22

 

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