What is the difference between Dom and welded tubing?

DOM (Drawn Over Mandrel) tubing and welded tubing are two common types of steel tubing used in various applications. Here are the main differences between them:

1. Manufacturing Process: DOM tubing is manufactured by drawing a solid round Steel Bar through a die and over a mandrel, which forms the tube while maintaining its shape and dimensions. This process ensures a seamless and consistent product with precise tolerances. Welded tubing, on the other hand, is created by welding together two or more pieces of steel, typically in a longitudinal seam.

2. Strength and Durability: DOM tubing is known for its superior strength and durability. It has a higher tensile strength and yield strength compared to welded tubing, making it suitable for applications where greater structural integrity is required. The seamless construction of DOM tubing enhances its resistance to fatigue and cracking.

3. Smoothness and Surface Finish: DOM tubing has a smooth interior and exterior surface finish due to the cold-drawn process. This smoothness reduces friction and facilitates better flow characteristics, which is advantageous when used in applications such as hydraulic cylinders or precision machinery. Welded tubing may have a slightly rougher surface due to the welding process.

4. Consistency and Dimensional Accuracy: DOM tubing is manufactured to precise specifications, resulting in more consistent dimensional accuracy throughout the entire length of the tube. The cold-drawing process ensures uniform thickness, size, and concentricity. Welded tubing can have variations in dimensions due to the welding process, and it may require additional processes like sizing or straightening.

5. Availability and Cost: Welded tubing is more readily available and often less expensive compared to DOM tubing. The manufacturing process of welded tubing is simpler and requires fewer manufacturing steps, leading to lower production costs. DOM tubing, being a specialized product, may have a higher price point and may require longer lead times for production.