Welded Elbow Introduction

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

Welded elbow is a metallic pipe fitting used to change the direction of pipeline on a pipe.

Use: Connect two pipes, allowing the pipes to change direction and bend to 45 degrees, 180 degrees, 90 degrees, or other angles.

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

Variety Classification

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

Welded elbows are categorized by angle: the most commonly used are 45-degree elbows, 90-degree elbows, 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. The most commonly used are STD and XS.

Production Process

Welded elbows can be roughly categorized into: hot push forming, stamping forming, and medium plate welding forming.

The hot-push elbow forming process boasts features such as 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 applied in the forming of certain specifications of stainless steel elbows.

Bendings formed by stamping are an early method used for mass production of seamless bendings, which has been replaced by hot extrusion or other forming processes for commonly used specifications. However, in certain specifications of bendings, 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 medium plate and a press brake, and then the two sections are welded together; this process is generally used for the production of large-diameter socket weld elbows with DN700 and above.

Application Fields

Due to the excellent comprehensive properties of welded elbows, they are widely used in basic engineering fields such as chemical industry, construction, water supply, drainage, oil industry, light and heavy industries, refrigeration, sanitation, plumbing, fire protection, electricity, aerospace, shipbuilding, etc.

Procurement Recommendation

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

2: manufacturers of elbows must provide material test reports and related documents for elbows.

3: Elbows must have corresponding specification and model embossed on them with identification marks.