The protective gas pressure for welding flanges is to avoid slight leakage of welding flanges. The protective gas in the furnace should be connected to a certain positive pressure. Assuming it is hydrogen protective gas, it is generally required to be above 20kBar. Annealing air is generally used for welding flanges with pure hydrogen gas, and the air purity is above 99.99%. If the other part of the air is an inert gas, the purity can be lower, but it cannot contain too much oxygen and water vapor.
Regardless of whether the annealing temperature inside the welded flange reaches the specified temperature, the welded flange is generally subjected to solution heat treatment, also known as "annealing", with a temperature range of 1040~1120 ℃. It can also be investigated through the survey holes of the annealing furnace. The welded flange fittings in the annealing area should be incandescent, but without softening or sagging.
Welding flanges to treat water vapor in casting furnaces. On the one hand, check whether the furnace material is dry, as the furnace material needs to be dried for the first time. The second issue is whether there are too many water stains on the welded flange fittings when entering the furnace, especially those with holes. Do not leak water into them, otherwise the air inside the furnace will be crushed.
Sealing of welding flange furnace, welding flange bright annealing furnace should be sealed and isolated from the outside air; When hydrogen is used as a protective gas, an exhaust port is opened. The inspection method can be to wipe the cracks at the joints of the annealing furnace with water to see if they run away; The place where gas leaks briefly is both the inlet and outlet of the annealing furnace. The sealing ring in this area wears out very briefly and needs to be checked and replaced regularly.
