By js55
Date 12-17-2008 22:18
Edited 12-17-2008 22:27
10's a good choice. Perhaps a little more alloy than you need, though maybe not in strong oxidizing service. The 4 will still out perform AL6XN in the 10% FeCl3 test. 4 and 10 will handle Mo segregation better than 3, and far better than the AL6XN HAZ. Though 3, like 10 matches the Cr better. But the main thing is 4 and 10 use W instead of Cb/Nb (depending upon what side of the ocean your on) so the perceived problem with N goes away, and they are less prone to hot cracking, at least in my experience.
As for cracking you still haven't said what it is your seeing.
I would gather centerline hot cracking. Though neither of these fillers are exessively prone to hot cracking, as long as parameters are within reason.
What parameters are you running?
Do you have good convexity on your beads?
Are they narrow?