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How to Weld Flanged Pipe Fittings

Jul. 29, 2026

A weld flange is a connecting component used to join pipes and fittings at their ends. These flanges feature bolt holes; two flanges are bolted tightly together with a gasket placed between them. As a disc-shaped component, the weld flange is the most widely used type in piping engineering.

Flange-to-pipe connection method:

Flange connection involves securing two pipes, fittings, or pieces of equipment together. A flange gasket is placed between the two mating faces, and the assembly is secured with bolts to complete the connection. Welding is a crucial method for joining components in high-pressure piping systems. Weld flanges are convenient to use and capable of withstanding high pressures. They are widely utilized in sectors such as the petroleum, chemical, natural gas, power generation, and metallurgical industries.

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Cast flanges feature rough external shapes but precise dimensions, require minimal machining, and offer low costs; however, they are prone to casting defects (such as porosity) and cracks (often due to inclusions), and their internal structure is suboptimal (resulting in poor grain flow characteristics after cutting).

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