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How to anneal butt welding flange
2023-06-13
Welding flange shielding gas pressure, in order to avoid welding flange slight leakage, the furnace shielding gas to a certain positive pressure, assuming hydrogen shielding gas, the general requirements of more than 20kBar. Annealing air, welding flange generally use pure hydrogen as annealing air, air purity of more than 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 in the welded flange reaches the specified temperature, the welded flange generally adopts solution heat treatment, which is commonly referred to as "annealing", and the temperature is planned to be 1040~1120 ℃. It can also be investigated through the investigation hole of the process annealing furnace. Butt-weld flange fittings in the annealed area should be incandescent, but without softening and sagging.
The butt welding flange treats the water vapor in the casting furnace. On the one hand, check whether the furnace body material is boring, and the furnace body material needs to be dried for the first time. The second is whether there are too many water stains on the butt welding flange pipe fittings, especially if there are holes in the butt welding flange pipe fittings, do not leak water into it, otherwise the air in the furnace will be crushed.
The welding flange furnace is sealed, and the welding flange bright annealing furnace should be closed and isolated from the outside air; when hydrogen is used as a protective gas, an exhaust port is opened. The inspection method can wipe the cracks in the joints of the annealing furnace with water to see if they run; the place where the gas leaks briefly is the place where the annealing furnace enters the tube and the place where the tube is discharged. The wear of the sealing ring in this place is particularly short, so it should be checked and replaced frequently.
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