Got an answer to the original question! | |
According to the experts at Quimby Welding Supply, my local supplier, preheating with any kind of flame will contaminate the weld seriously enough that it will need cleaning after applying the flame.
They recommend only applying a clean heat source such as an electric heating blanket (the welding specific kind, not the bedroom kind). An electric stove element will also work, but tranfering preheated pieces of aluminum from the kitchen to the garage might be tricky!
I'll try again without preheating and see if I have better results. |