Characteristics of stainless steel flanges

Characteristics of stainless steel flanges

The stainless steel flange is characterized by fast welding speed and good weld shape.

Stainless steel (stainless acid-resistant steel) flange is a disc-shaped part, which is more common in pipeline engineering, and flanges are used in pairs. In pipeline manufacturing, Flanges are mainly used for the link of pipelines. In the pipelines that need to link, Various devices include flanges. Wire flanges and welded flanges can be used for pressure-deficient pipelines, and the pressure is greater than 4 kg. Add sealing points in the two flanges, immediately after tightening with bolts. Flanges with different pressures have different thicknesses and use different bolts. When the water pump, valve and pipeline are connected, some parts of these equipments are also made into corresponding flange shapes, also known as flange connection.

All connecting parts that are closed with bolts at the periphery of the two planes are collectively called “flanges”; such as the connection of ventilation pipes, such parts can be called “flange parts”. But this connection is only a part of the equipment, Such as the text between the flange and the pump, It is not easy to call the pump a ‘flange part’. Smaller ones, such as valves, are always called ‘flange parts’.

The welding requirements of stainless steel (stainless acid-resistant steel) flanges are very high, and a slight bubble in the welding process may cause accidents in the future.

For example, the gas generator in the automotive airbag system is a device with a stainless steel flange as the main structure. It is mass-produced in an assembly line, and the generator is welded by laser (LASER).

Stainless steel flange has the advantages of fast welding speed and good weld shape

Stainless steel (stainless acid-resistant steel) flanges will not corrode, pit, rust or gall (a fundamental type of component failure). Neck flange connection or flange joint refers to the detachable connection of flange, gasket and bolt as a combined sealing structure. Due to its good corrosion resistance, stainless steel enables structural components to best maintain the integrity of the engineering design. Chromium-containing stainless steel flanges also combine mechanical strength and high elongation, are easy to process and manufacture parts, and can meet the needs of architects and structural designers.

All metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide that forms on plain carbon steel continues to oxidize, causing rust and eventually holes. Carbon steel surfaces can be protected by painting or electroplating with oxidation-resistant metals (such as zinc, nickel, chromium), but this protection is known to be only a film (thin, soft, transparent flake).

Stainless steel flange has the advantages of fast welding speed and good weld shape

Laser welding has the advantages of fast welding speed and good weld shape, but the welding gap is strict, the preparation time before welding is long, the welding cost is high, and the equipment is expensive.

Especially for spot welding, the welder needs to complete 8 laser beams. The opening and closing of the gate not only consumes equipment but also has low efficiency, which is incompatible with the requirements of high efficiency (referring to high efficiency), high quality and low cost of assembly line production.

When the water pump, valve and pipeline are connected, some parts of these equipments are also made into corresponding flange shapes, also known as flange connection. Flat welding flanges are flanges that are directly welded to equipment or pipelines through fillet welds. The structure is simple and the processing is convenient. Its stress characteristics are between the integral flange and the ring flange.

Flat welding flanges are divided into plate type flat welding flanges and neck flat welding flanges. The flat welding flange has low cost and short production cycle. It is more commonly used. A flange type widely used in various fluid pipelines.

So now many stainless steel flange manufacturers will use other welding methods instead of laser welding to achieve the same effect and save a certain cost. Therefore, energy storage welding is recommended for stainless steel flanges. When the tensile strength of the solder joint reaches or approaches the laser welding strength, it can be replaced (use one material instead of another for laser spot welding to improve the overall welding efficiency and Q3Q2Q1 electrode to reduce energy consumption to meet the low consumption and rapid production of the assembly line The principle of one-time flattened capacitor energy storage welding: under the condition of pressure, the capacitor discharge pulse.