I'm not sure either because you definitely have the right tools for the job. As I have said before, the Sievert with a large burner should easily, and I mean *easily* melt up to 50g of Silver in a 3" crucible. I have done it many times without any problem.
Does the shed provide enough shielding from the wind? Even if it doesn't I can't imagine that is the root cause of the problem as I have seen a few youtube videos of people melting and pouring Silver ingots outdoors.
Try the following procedure:
(It would be handy to have a timer when doing this)
1) Put all the silver you want to melt in the crucible.
2) Make sure the gas is OFF at the Sievert handle.
3) Turn the gas FULL ON at the propane tank. i.e. Keep turning the valve control anti-clockwise until it stops.
4) Light your torch and turn it FULL ON. The flame should be roaring out.
5) Heat your Silver until it glows red, then move the flame away and sprinkle borax over it.
6) Put your flame on the Silver and start your timer.
7) Keep the flame aimed in ONE place on your Silver.
8) At approx. the 1 minute mark that part of Silver should begin to shimmer. KEEP the flame in the same location on the Silver.
9) At approx. 90 sec to 2min that part of Silver will begin to ball up and melt. KEEP the flame in the same location on the Silver.
10) When the Silver you have your flame on is completely molten (approx 2.5 minutes), lift the crucible while keeping your flame on the molten Silver and gently tilt the crucible so that the molten silver rolls towards a part of the Silver that is not yet molten. Always following the molten Silver with your flame.
11) Once the molten Silver engulfs the yet to melt Silver, hold the crucible in that position and keep your flame directed on that area of Silver until it is molten.
12) You should be able to follow steps 10 & 11 until you 'sweep' up all the Silver that isn't molten. Always keeping your flame on the molten ball as it rolls around.
13) Once you have a single molten ball, which shouldn't take any longer than 3 minutes, you can add more borax. Always move your flame away when you do this. The Silver will cool down a little bit but it should only take a few seconds to get it molten again
14) Once molten, you need to either swirl or tilt the crucible to expose any Silver that is not yet molten within the centre. Always keeping your flame on the Silver.
15) By about 4 minutes the Silver ought to be completely molten. Repeat step 13 perhaps another time.
16) Keep swirling and tilting the crucible, Always keeping your flame on the Silver. You should see the Surface of the Silver rolling.
17) By about 5 minutes the Silver should be ready to pour.
18) Slowly bring the crucible to your mould, always keeping your flame on the Silver. i.e. Move the torch and crucible together. Just be mindful that the Delft clay casting flask is Aluminium and has a lower melting point than Silver.
19) Tilt the crucible until the Silver is almost near the spout of the crucible and keep your flame on the Silver.
20) Pour the Silver into the mould as you move the flame away.
This should work. Do everything in slow motion (Except Step 20, you should pour as quick as you can). Do not wave the flame around too much, you don't need to get all the Silver molten at the same time. Hopefully someone will correct any obvious errors but if this doesn't work, I give up
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