Welded Elbow Brief Introduction

Welded elbow alias: Pressed elbow, Seamless elbow, Steel elbow, Forged elbow, Weld neck elbow, etc., the names vary by region, all belonging to the elbow series.

Welding elbows are metal pipe fittings used to change the direction of pipeline on a pipe.

Application: Connect two pipes to change the direction of the pipes to 45°, 180°, 90°, or other angles.

Manufacturing Standards: National Standard, American Standard, Japanese Standard, German Standard, Russian Standard

Variety Classification

Welded elbow curvature radii classification: They can be divided into long-radius elbows and short-radius elbows; a long-radius elbow refers to its curvature radius being 1.5 times the pipe's outside diameter, i.e., R=1.5D; a short-radius elbow refers to its curvature radius being equal to the pipe's outside diameter, i.e., R=1.0D; (D is the elbow diameter, R is the curvature radius; D can also be expressed in multiples;)

Welded elbows are categorized by angle: the three most commonly used are 45-degree, 90-degree, and 180-degree elbows. Additionally, other non-standard angle elbows, such as 60-degree elbows, are included based on engineering requirements.

Welded elbows are categorized by material: carbon steel elbows, stainless steel elbows, alloy steel elbows, etc.

Welded elbows are categorized by pressure ratings: there are approximately seventeen types, and those that align with American pipe standards include: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, with STD and XS being the most commonly used.

Production Process

Welded elbows can be roughly divided into: hot push forming, stamping forming, and midplate welding forming.

The hot push elbow forming process is highly recommended for its aesthetically pleasing appearance, uniform wall thickness, and continuous operation, making it suitable for mass production. Consequently, it has become the primary forming method for carbon steel and alloy steel elbows, and is also used in the forming of certain specifications of stainless steel elbows.

Bending elbows formed by stamping were earlier used in the production of seamless bending elbows in bulk, but have been replaced by hot extrusion or other forming processes in the production of commonly used sizes. However, in certain sizes of bending elbows, they are still used due to low production volumes, excessively thick or thin walls.

A half-section of the elbow profile is formed using a plate bending press, followed by welding the two sections together; this process is typically used for the production of large-diameter socket weld elbows with DN700 or more.

Application Fields

Welded elbows offer excellent comprehensive properties, making them widely used in fundamental engineering across various sectors including chemicals, construction, water supply, drainage, oil, light and heavy industries, refrigeration, sanitation, plumbing, firefighting, electricity, aerospace, shipbuilding, and more.

Procurement Recommendations

1: We recommend purchasing from a reputable elbow manufacturer with a certain scale of production.

2: manufacturers of elbows are required to provide material test reports and related documents for elbows.

3: Elbows must have corresponding specification model stamping and marking.