Difference between ERW pipes,SSAW pipes and LSAW pipes

Electirc resistance weld(ERW),spiral submerged arc weld(SSAW),longitudinal submerged arc weld(LSAW) are the common methods of forming process of welded steel pipes.From manufacturing processes we can know that SAW steel pipes(LSAW steel pipes,SSAW steel pipes) and ERW steel pipes are entirely different right from formation,welding etc.So the performance of ERW pipes,SSAW pipes,LSAW pipes differ in the following aspects:

ASTM A53 Grade B ERW Steel Pipes

1. The surface quality of ERW pipe,SSAW pipe and LSAW pipe is different:

Though both SAW pipes(LSAW pipes,SSAW pipes) and ERW pipes all have weld seam.The welding seam of ERW pipe is flat,smooth and better than SAW(LSAW,SSAW) pipes.In most of the SAW pipe(LSAW pipe,SSAW pipe),it is mainly about the weld reinforcement internally and externally.

2.ERW steel pipe weld defect types is less than the SAW pipe(SSAW pipe,LSAW pipe)

Because of the solvent deposited in SAW,in addition to volume defects it results in more defects.The defects found in ERW steel pipes are only straight welds and wire-line and are easy to inspect.The defects can be noticed easily and the ultrasonic reflection on the surface makes it easier to detect.

Longitudinal submerged arc welded (LSAW) steel pipes

3. The residual stress ratio in ERW is lower than SAW pipes(SSAW pipe,LSAW pipe)

ERW steel pipe related to SAW steel pipe in residual stress ratio is low.Since ERW pipe deformation in the deformation process more fully,coupled subsequent sizing flat oval,elliptical vertical changes and necking, making ERW pipe residual stress becomes smaller.Physical testing showed that the same specifications,the same material ERW pipe after incision along the axis,the axial and transverse incisions smaller displacement than the SAW pipe.

4.The overall performance of ERW pipe,SSAW pipe and LSAW pipe is different:

Although the overall performance of both ERW pipe and SAW pipe are the same,when the pipe becomes defective,the steel scrap and welding can be done on ERW pipe,while it is not the same in case of SAW,which would result in cracking or corrosion.So ERW pipe are more durable than SAW pipe.

Spiral submerged arc welding (SSAW) steel pipes

Haihao Group could produce all kinds of type steel pipes(seamless steel pipes,welded steel pipes-ERW pipes,SSAW pipes,LSAW pipes,casing pipes,galvanized steel pipes,etc) as per client’s specific requirements;in addition,we also make butt welding pipe fittings,forged pipe fittings(45°/90°/180° elbow,tee,reducer,cap,bend,cross,nipple,outlet,etc) and forged flanges products,we have perfect heating process with advanced technology and profession technician,if you have any questions,please email us:sales@haihaogroup.com