Welded Elbow Introduction

Welded elbow alias: Pressed elbow, Seamless elbow, Steel elbow, Forged elbow, Weld neck elbow, etc.; different regions have different names, all of which belong to the elbow series.

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

Application: Connect two pipes, allowing the pipes to change direction to 45-degree, 180-degree, 90-degree angles, or other angles.

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

Variety Classification

Welded elbow curvature radius classification: They can be divided into long-radius elbows and short-radius elbows. Long-radius elbows refer to elbows where the curvature radius is 1.5 times the pipe outer diameter, i.e., R=1.5D. Short-radius elbows refer to elbows where the curvature radius is equal to the pipe outer diameter, i.e., R=1.0D; (D represents the elbow diameter, R represents the curvature radius; D can also be expressed in multiples;)

Welded elbows are categorized by angles: the most commonly used ones 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, including 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 are the same as 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 broadly categorized into: hot-formed, stamping-formed, and medium plate welding-formed.

The hot push bending process is highly recommended for its aesthetically pleasing shape, even wall thickness, and continuous operation, making it suitable for mass production. Therefore, 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.

Press brake formed elbows were earlier used in the forming process for bulk production of seamless elbows, but have been replaced by hot extrusion or other forming processes in the production of commonly used elbow sizes. However, in certain sizes of 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 medium plate and a press bending machine, 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

Welded elbows are widely used in fundamental engineering sectors such as chemical, construction, water supply and drainage, petroleum, heavy and light industries, refrigeration, sanitation, plumbing, firefighting, power, aerospace, shipbuilding, due to their excellent comprehensive performance.

Procurement Recommendations

1: It's recommended to purchase from a reputable elbow manufacturer with a certain production scale.

2: manufacturers of elbows must provide material inspection reports and other relevant documents.

3: Elbows must have corresponding specification and model steel stamp and marking.