Manufacturing Process of Welding Flanges:
One, has the annealing temperature reached the specified temperature? The treatment for welding flanges is generally solid solution heat treatment, commonly known as "annealing," with a temperature range of 1040~1120℃ (Japanese standard). You can also observe through the observation hole of the annealing furnace; the flange pipe parts in the annealing area should be in a bright glow state but not show softening and sagging.
Two, during the welding flange machining, check for moisture and steam in the casting furnace. First, ensure the furnace materials are dry; for the initial loading, the furnace materials must be thoroughly dried. Second, inspect the flange pipe components for excessive water stains upon entry; especially if there are holes in the flange pipe components, make sure no water leaks in, otherwise it could destroy the furnace atmosphere.
Three, Furnace Sealing. The bright annealing furnace with welding flanges should be sealed and isolated from external air; if hydrogen is used as the protective gas, there is only one exhaust port that is open (used to ignite the expelled hydrogen). The inspection method involves applying soap water to the gaps at various joints of the furnace to check for leaks; the areas most prone to leakage are where the pipes enter and exit the furnace, as the sealing rings in these areas are particularly susceptible to wear. It is essential to inspect and replace them regularly.
Four, Protective Gas Pressure. To prevent minor leaks in the welded flange, the protective gas inside the furnace should maintain a certain positive pressure, typically requiring 20kBar or above if hydrogen gas is used for protection.
Five, Annealing Atmosphere. Welding flanges typically use pure hydrogen as the annealing atmosphere, with a purity of 99.99% or above. If the other part of the atmosphere is an inert gas, the purity can be slightly lower, but it cannot contain too much oxygen or moisture. Our business philosophy: To survive through quality and to develop through integrity. "Excellent quality, all in JINLIANG Pipe." Special for high-end engineering projects, quality guaranteed. We firmly believe that success stems from continuous innovation and pursuit. Our products are of high quality, and purchasing our products means buying peace of mind and ease. Being an honest merchant, valuing contracts, and upholding credibility is the foundation of our business. Service is in place.