One can make drill be abundant in material layer in the furnace heating time, make the drill can reflect the actual
circumstances of the furnace material layer, the normal again if stirring rake have spin behind the second hole pin,
the pin time is 37.5 seconds, less measure brazing wouldn't be the same.
The second is insert bit in advance.When stirring rake has not yet reached the fire detecting hole before insert in
advance, the stirring rake can take this drill with rotation, when the brazing pull, push and pull out, the result
can only be stirring rake reversals, relax to remove and serious in furnace, until this qian was burned in the fire
layer, upper to pull out, and the residue in the furnace parts and will affect the normal ash.
So must see stirring rake position before soldering, can throw, cannot vote before it.
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