In general, seamless pipes can be considered stronger than welded pipes due to their homogeneous structure and absence of weld seams. Here are some factors to consider:

Strength Comparison

Homogeneous Structure: Seamless pipes are produced by extruding a solid billet of steel through a die to form the shape of the pipe. This process results in a uniform grain structure throughout the entire length of the pipe, which can contribute to higher strength and resistance to pressure and mechanical stresses.

Welded Seam Issues: Welded pipes are manufactured by welding together the edges of a steel plate or coil to form a cylindrical shape. The weld seam introduces potential weak points, where stress concentrations can occur, reducing the overall strength of the pipe compared to seamless pipes.

Other Considerations

Quality Control: Seamless pipes undergo stringent quality control measures during manufacturing to ensure uniformity in composition and structure, which contributes to their strength.

Applications: Seamless pipes are typically preferred for high-pressure and critical applications where strength, reliability, and resistance to corrosion are crucial, such as in the oil and gas industry for pipelines.

Welded Pipe Advantages

Cost and Availability: Welded pipes are generally more cost-effective and easier to produce in large quantities, making them suitable for less demanding applications where strength requirements are not as critical.

Flexibility: Welded pipes can be manufactured in larger diameters and lengths than seamless pipes, offering flexibility in design and installation.

Conclusion

While both seamless and welded pipes have their advantages and applications, seamless pipes are often considered stronger due to their uniform structure and absence of weld seams. However, the choice between seamless and welded pipes ultimately depends on specific application requirements, including factors such as pressure, temperature, corrosion resistance, and budget considerations.