Difference between ERW and DSAW pipes

Electric Resistance Welded Pipe
ERW pipes means Electric Resistance Welded Pipes.
Electric resistance welding at a glance
Figure1

Difference between ERW and DSAW pipes is generated in the carbon steel smelting defect smelting and casting process, such as segregation, non-metallic inclusions, porosity, shrinkage and cracks.

Double Submerged Arc Welded (DSAW) steel pipe
Double Submerged Arc Welded (DSAW) steel pipe
Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. Both inside and outside welds are performed.
Segregation
Segregation is the uneven distribution of chemical composition in the steel, in particular harmful elements such as sulfur, phosphorus enrichment in the ingot.
Non-metallic inclusions

Non-metallic inclusions refers to non-metallic inclusions in steel containing impurities such as sulfides and oxides.

Stomata

Stomata refers iron and carbon monoxide gas effect generated in the pouring can not fully escape and stay in the tiny pores in the ingot.

Shrinkage
Shrinkage is due to the liquid steel ingot mold from outside to inside, the volume contraction during solidification bottom-up, because the level drops, the final solidification of liquid steel parts can not be added to form.
Crack

Solidification of liquid steel in the order due to different causes stress, tension cracks may appear larger parts.




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