What Is The Difference Between ERW And SSAW Pipes
1. Strength and toughness:
Generally speaking, SSAW pipes, due to the use of double-sided submerged arc welding, have relatively high weld quality and thus possess high strength and toughness.
Although the production process of ERW pipes is simple, the quality of the weld seams may be somewhat limited, especially in the production of large-diameter and thick-walled pipes.
2. Production process:
ERW: The resistance heat generated by high-frequency current heats the edge of the tube blank to a plastic state. Then the workers apply pressure for welding. This method is applicable to the production of pipes with relatively small diameters and thin wall thicknesses.
SSAW: It uses coil plates as raw materials.The forming machine rolls the steel plates into tubular shapes, and then the workers will weld them using double-sided submerged arc welding technology. This method is applicable to the production of large-diameter and thick-walled pipes.
3. Weld shape:
ERW: The weld seam is linear and located along the longitudinal direction of the pipe.
SSAW: The weld seam is spiral and extends along the spiral direction of the pipe.
4. Application Scope:
ERW: It is often used in the transportation of low-pressure fluids, structural support and other fields.
SSAW: It is mainly used for high-pressure and large-diameter oil and gas pipelines, as well as structural supports for Bridges, buildings, etc.
Advantages Of SSAW Pipes
ERW pipes are mainly formed by heating the edges of steel strips to a plastic state through high-frequency resistance welding and then pressing and welding them together. The weld seams are straight. SSAW pipes are made by forming the coil in a spiral shape and then welding it with submerged arc welding, resulting in a spiral weld seam. This process enables the steel pipe to generate greater heat input during the welding process. It is conducive to the fusion of the weld metal and the escape of gases, thereby improving the quality of the weld seam.
1. Material utilization rate:
SSAW steel pipes use wide coil plates as raw materials. Compared with the narrow steel strips used in ERW pipes, they have a higher material utilization rate and reduce material waste.
2. Production cost:
Due to its relatively simple production process and high degree of automation, coupled with high material utilization rate, its production cost is usually lower than that of ERW pipes, especially in the production of large-diameter steel pipes.
3. Scope of Application:
Due to its high strength, high toughness and good welding performance, SSAW welded pipes are widely used in long-distance pipelines such as oil and natural gas, urban water supply and drainage and other fields. Especially in engineering projects that need to withstand large internal pressure and complex geological conditions, it has more advantages.
4. Performance:
In terms of corrosion resistance, fatigue resistance and other aspects, SSAW pipes also demonstrate superior performance compared to ERW pipes. This is attributed to the thorough fusion of its welds and the heat treatment process, which enhances the overall performance of the steel pipe.
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