"Galvanized steel pipe" is a general term referring to all steel pipes that have undergone galvanizing for corrosion protection. "Galvanized welded steel pipe" is the most important and specific subcategory within this category, specifically referring to products that are first manufactured into pipes through welding processes (such as straight seam welding and spiral welding) and then galvanized.
"Galvanized steel pipe" is a broad category, which mainly includes two types of products based on the different forming processes of the base pipe: galvanized welded steel pipe and galvanized seamless steel pipe. Therefore, when referring to "galvanized steel pipe," it does not specify whether the base pipe is welded or seamless.

The key lies in the type of base pipe: Galvanized welded steel pipe uses a welded pipe as its base pipe. Its characteristics include economic cost and large production volume, and it is widely used in low-pressure fluid transportation (such as building water and gas pipes) and general structures (such as scaffolding).
Galvanized seamless steel pipe, on the other hand, uses a seamless steel pipe as its base pipe. It has a stronger pressure-bearing capacity and is typically used in mechanical structures and critical equipment pipelines with higher strength requirements.

Galvanized welded steel pipe belongs to the category of galvanized steel pipe. In everyday life, unless otherwise specified, the term "galvanized pipe" usually refers to the most common and affordable "galvanized welded steel pipe." When choosing a galvanized welded steel pipe, it is sufficient for ordinary low-pressure applications; however, for critical structures requiring high pressure and strength, galvanized seamless steel pipe must be used.

Both galvanized steel pipe and galvanized welded pipe belong to the galvanized steel pipe series. Galvanized steel pipe is a common seamless steel pipe with a galvanized coating. Its zinc coating is generally thinner, and its advantages are higher corrosion resistance and aesthetic appearance, making it suitable for some indoor pipe installations.
Galvanized welded pipe is a product obtained by galvanizing ordinary welded pipe. Its zinc coating is generally thicker, which has stronger corrosion resistance and a longer service life. Galvanized welded pipes are suitable for high-pressure and large-diameter pipelines, such as those in chemical, petrochemical, and power industries, as well as for outdoor pipeline installations.

Answers

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