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What is Expanding Flange? Uses, Welding, and Types

Expanding Flanges

An expanding flange is an incredibly useful tool used in many industries. It is a type of blind flange that has no bore and is used to connect two different pipes together. It’s often used in plumbing and piping applications, as it provides a secure connection between two pieces while also allowing for ease of installation. This blog will discuss the different types of expanding flanges and their uses in the industry.

What is Expanding Flange?

Expanding Flanges are a type of mechanical device that is used to secure pieces of larger machinery together. Typically made from durable materials like metal, their chief purpose is to ensure that all components of a given unit remain connected and operate smoothly. They act as an internal fastening system for rotors, compressors, or structural components. To use expanding flanges, the two pieces have to have cylindrical inner sections, with one piece slid over the other before being placed in the machine. When torque is applied, it causes the material to expand (inwards) and lock everything solidly together, providing a tight connection and helping prevent damage due to vibration or rotational issues.

Expanding Flange Uses

Expanding flanges are commonly used in the plumbing and pipefitting industry to join two pipes quickly and effectively. They can also be used as a temporary solution to plug leaks from other types of flanges or pipes that have been damaged. Additionally, they can be used to join sections of pipe when welding or brazing isn’t an option due to location or other constraints.

Expanding Flange Welding

When welding an expanding flange, the weld must be completed correctly so that no leaks occur once the joint has been made. This process typically involves using a filler material to fill any gaps between the two pieces being joined together before applying heat via welding equipment. The heat should be applied evenly across the entire surface area of the flange to ensure a successful welding job.

Expanding Flange Types

Several different types of expanding flanges are available on the market today, each with its unique benefits and drawbacks depending on your particular application needs. These include threaded, slip-on, weld-neck, lap-joint, socket-welded, and blind flanges – all designed for different purposes and conditions.

Depending on your requirements, one type is more suitable than another for your project needs.


In conclusion, expanding flanges are incredibly versatile tools that can be used for many applications within the plumbing and pipefitting industry. They provide a secure connection between two pieces while also allowing for ease of installation without needing additional welding or brazing equipment on site. Furthermore, several types are available depending on your project requirements – such as threaded, slip-on, weld-neck, lap-joint, socket-welded or blind flanges – all designed with specific purposes in mind. Website owners and SEO newbies looking for quick connections between pipes without needing extra equipment on hand should consider expanding flanges–they may save you time!

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