Serious question, do we really need to warm crucibles for every single pour?

I've worked in casting for a few seasons now. Sometimes when we're busy, I don't warm the crucibles before pouring aluminum. The parts still turn out okay. My foreman says it's a rule, but I think it's only for big jobs or certain metals. For instance, with brass, I always warm them up. But for aluminum, it seems fine. Am I missing something? I'd like to hear from others who might do the same.

2 comments

2 Comments

hayes.jenny3d ago

Skipping crucible warm-up for aluminum pours? That's how you get steam pockets and ruined parts. Aluminum may seem forgiving, but cold crucibles can lead to incomplete pours or even cracks. I once had a batch fail because we rushed and didn't preheat. Brass absolutely requires it, but aluminum isn't a free pass. The rule exists for a reason, even on busy days.

phoenixb663d agoOG Member

Wait, you can skip warm-up on aluminum? That's wild. I'd be too scared of wrecking the whole batch.