Introduction to Weld Neck Flanges

Socket weld flange according to standard should be a Socket weld neck flange product, as some customers may not be clear about it and see or think of adding a small short neck to the socket weld flange, thereby creating the term "Socket weld neck flange" or "neck flange", with the English abbreviation: So Flange

Characteristics of flat焊接neck flanges

Welded neck flanges, compared to flat welding flanges, also known as flange plates, feature an additional short neck, significantly enhancing the flange's rigidity and improving its load-bearing capacity.

The flat welding neck flange not only saves space and reduces weight, but more importantly, it ensures that there will be no leakage at the joint. Additionally, the flat welding neck flange offers a variety of sealing face types, providing excellent sealing performance.

Specification Model

DN15-DN1000

Pressure Rating

PN6~PN100

Sealing Surface Type

Rounded Face (RF), Flat Face (FF), Milled Face (MFM), Concave Face (FM), Raised Face (M), Tongue and Groove (TG)

The concave and convex surfaces (MFM) are for matching use.

Common materials

Carbon steel, alloy steel, stainless steel.

Welding Neck Flange with Flat Face - Standard Compliance

HG/T20592~20635-2009

GB/T 9116-2010

There are necked flat welding flanges available in various international standards, including ANSI, DIN, and JIS.

Connection Type

Same welding method as flat flange, single-sided welding, double-sided bolted.

Production Process

Pure material forging, highly precise lathe processing.

Advantages and Disadvantages of Weld Neck Flanges

Advantages: The necked flat welding flange is also a type of flat welding flange, due to its short neck, which enhances the flange's strength and improves its load-bearing capacity; thus, it can be used on piping systems subject to higher pressures.

Disadvantages: More expensive than flat welding flanges due to their shape, which makes them more prone to dings during transportation.

Procurement Recommendations

Purchase from a reputable socket weld flange manufacturer with a certain scale of production.

2: Manufacturers of flanges are required to provide material inspection reports and related documents for necked butt-welding flanges.

3: Necked flat welding flanges must have corresponding specification model stamps and markings.