What is a longitudinal weld?

Longitudinal welding is when a plate or sheet of metal is formed into a circle and the faying surfaces are coalesced so that the plate is converted into tubing. The inside of the tubing or pipe can collect debris around the weld area, increasing the risk of corrosion.

What is longitudinal pipe?

Simply put, the manufacturing process of longitudinal welded pipes is basically the bending and welding of wide steel plates so that pipes can be formed from leveled hot rolled coils. The coils are shaped during the forming process closely resemble the English alphabets, such as J, C, U, O.

What is transverse weld?

A transverse fillet weld is one that is perpendicular to the force applied as seen in the image below. Because the load is perpendicular to the weld it is considered a tensile load.

What are the differences between longitudinally and spirally welded pipes?

Straight-weld pipes are created by bending and forming metal, which is then welded together down the length of the pipe to create a straight, longitudinal seam. Spiral-weld pipes, on the other hand, are rolled and welded according to a preferred helical angle.

What are the 5 basic types of welding joints?

There are five basic welding joint types commonly used in the industry, according to the AWS:

• Butt joint.
• Tee joint.
• Corner joint.
• Lap joint.
• Edge joint.

What is the purpose of a fillet weld?

The weld is triangular in shape and may have a concave, flat or convex surface depending on the welder’s technique. Welders use fillet welds when connecting flanges to pipes and welding cross sections of infrastructure, and when bolts are not strong enough and will wear off easily.

What is longitudinal stress formula?

The longitudinal stress is σl sin cot and the tangent one is σt sin(ωt + φ) with σl/σt = λ.

What are longitudinal stresses?

Longitudinal stress is defined as the stress produced when a pipe is subjected to internal pressure. The direction of the longitudinal stress in a pipe is parallel to the longitudinal axis of its centerline axis, which means that the stress acts in the direction of the pipe’s length.

Are welds strong in shear?

The allowable shear stress for the welds would be 70,000 psi x 0.30 = 21,000 psi. A reduction of 70% compared to the case where the fillet weld was in pure tension. If our two welds are ¼-inch fillets then the shear strength (load carrying capacity) of the welds is calculated as follows.

How do you calculate weld size?

Calculate the weld size, s, at each node on the intersecting edge of the terminated part:

1. SS or DS groove welds: s = t. w
2. SS or DS 45 ° fillet welds: s = sqrt(2) × t. w

How is spiral welded pipe made?

Spiral-welded pipe is produced from coils of steel that are unwound and flattened. The flattened strip is formed by angled rollers into a cylinder of the desired diameter. At the end of the coil, a new coil is butt-welded to the trailing edge of the pipe, forming a cross seam.