Basic concept of seamless size head

In industrial manufacturing and pipeline engineering, there are a variety of ways to connect various types of pipelines, and as one of the important connectors, the seamless size head plays an irreplaceable role in many applications with its structure and excellent performance. In this paper, the basic concept, structure characteristics, manufacturing process, application field, advantages and disadvantages of seamless size head are discussed in detail.

#### 1. Definition of seamless size head

Seamless size head, as the name suggests, is a pipe fitting used to connect pipes of different diameters. Its main function is to achieve pipe reduction or expansion, usually used in pipeline systems. When it is necessary to connect a large diameter pipe with a small diameter pipe, the size head can do this task well. The seamless design means that there are no welded joints during the manufacturing process, which can effectively avoid problems such as pipe leaks or fractures caused by stress concentration at the joints.

#### 2. Structural characteristics

Seamless size heads usually have the following notable features:

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