Welding 8620 (ASTM A732 Grade 13Q) investment casting
Welding 8620 (ASTM A732 Grade 13Q) investment casting
(OP)
A current supplier is requesting they substitute an 8620 investment casting instead of the specified 1020(A732 Grade 1A). The part is welded to low carbon steel tubing having .125 wall thickness. The part is not highly stressed. My concern is with weld cracking. I do not want to pre or post heat the weld. Should I be concerned? The reason they want to substitute is that they are having porosity issues with the 1A grade. Is this common?
grayseal
grayseal





RE: Welding 8620 (ASTM A732 Grade 13Q) investment casting
On the other hand, if your weld is not critical, could your supplier provide welability tesing, such as a Batelle underbead cracking test, or a Controlled thermal severity test?
RE: Welding 8620 (ASTM A732 Grade 13Q) investment casting
Thanks for the reply. Weldability testing sounds like a good start.
grayseal
RE: Welding 8620 (ASTM A732 Grade 13Q) investment casting
If the amount of welding is minimal (really "cosmetic" repairs) and the part is for a commercial application, you maybe go without PWHT, depends on the heat affected zone
RE: Welding 8620 (ASTM A732 Grade 13Q) investment casting
My part is threaded so I am avoiding Stainless alloys.
-awol