1. welding flange pipe fittings care gas pressure, in order to prevent welding flange pipe fittings small leakage, the furnace care gas should be connected to the necessary positive pressure, if it is hydrogen care gas, generally requires more than 20kBar.

2.annealing air, welding flange fittings are generally used as pure hydrogen annealing air, air purity is more than 99.99%, if the other part of the air is inert gas, the purity can also be a little lower, but can not contain too much oxygen, water vapor.
 

3. Whether the annealing temperature of butt welding flange pipe fittings reaches the designated temperature, the processing of butt welding flange pipe fittings is generally using solution heat processing, which is generally called "annealing", and the temperature is planned for 1040~1120℃.

4. Water vapor in the casting furnace is processed by welding flange pipe fittings. On the one hand, check whether the furnace body data is dry, and the furnace body data must be dried.The second is whether the flange pipe fittings into the furnace remain too much water stains.

5.butt welding flange pipe furnace body sealing, butt welding flange pipe bright annealing furnace should be closed, isolated from the outside air interval;Use hydrogen as caress gas, as long as one vent is open.The method of checking can be used to wipe the joint cracks in the annealing furnace with soapy water to see whether to run;The place where air is easy to run is the place where the annealing furnace enters the pipe and the place where the pipe is out. The sealing ring of this place is easy to wear and tear, so it should be checked and changed frequently.