Electric Resistance Welded Pipe

ERW steel pipe is formed by rolling plate and welding the seam.

It is cost-effective steel pipe with tighter Dimensional tolerances and less weight. The weld seam is heat treated after welding without untempered martensite remains. Also, the weld flash can be removed from both inner and outer surfaces.

ERW pipes by standards

ASTM A500

ASTM A500 standard specification covers carbon steel, cold formed welded and seamless structural tube in both round and shaped forms.

ASTM A53

Carbon Steel Seamless Pipes

ASTM A53 / A53M Standard covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26.

ASTM A178

ASTM A178/A 178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

API SPEC 5L

API SPEC 5L is a international standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) o f welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.

ASTM A513

ASTM A513 Type 1A mechanical tubing is produced from hot rolled strip steel while A513 Type 1B tubing is produced from hot rolled strip steel that has been pickled to remove scale then oiled to provide a cleaner surface than hot rolled.

ASTM A252

ASTM A252 standard covers nominal wall cylindrical steel pipe piles in which the steel cylinder acts as a permanent load-carrying member or as a shell to form cast-in-place concrete piles.

ASTM A178 / A178M

Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

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ASTM A178 standard referes to electric-resistance-welded tubes with minimum-wall-thickness. Materials are carbon steel and carbon-manganese steel, ASTM A178 pipe and tube is to be used in boiler tubes, boiler flues, superheater flues and safe ends.

Steel Grades A (low-carbon steel), C (medium-carbon steel), or D (carbon-manganese steel). Manufacturing processes must include heat treatment, welding after cooling. Crush test shall be performed if required by customer.

Dimensional tolerance of ERW steel pipe

Tolerance of outside diameter
 Out Diameter  Tolerance of Pipe End  Tolerance of Pipe Body
 219.1-273.1  +1.6mm, -0.4mm   ±0.75% 
 274.0-320  +2.4mm, -0.8mm  ±0.75% 
 323.9-457  +2.4mm, -0.8mm  ±0.75% 
 508  +2.4mm, -0.8mm  ±0.75% 
 559-610  +2.4mm, -0.8mm  ±0.75% 
Tolerance of wall thickness
 Grade  Out Diameter  Wall Thickness
 /  219.1-457  +15%, -12.5%
 B  508-610  +17.5%, -12.5% 
 X42-X80  508-610  +19.5%, -8%

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Even welding and smooth weld line, can be substitute for seamless tube after drawing and cold rolling.

A 178/A 178M – 02

Standard Specification for Electric-Resistance-Welded Carbon Steel, Carbon Manganese Steel Boiler, Superheater Tubes

SA-450/SA-450M

SPECIFICATION FOR GENERAL REQUIREMENTS FOR CARBON, FERRITIC ALLOY, AND AUSTENITIC ALLOY STEEL TUBES

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Recommended ERW pipes

Electric resistance welded (ERW) pipe is manufactured by cold-forming a sheet of steel into a cylindrical shape.

ERW pipe FAQs

The surface condition of steel pipe is known as the environment that this is through the steel pipe coating with the surrounding soil insulation, pipe surface condition is different from the four weeks the soil.

The alloy content of the coil is often lower than similar grades of steel plate, improving the weldability of the spiral welded pipe. Due to the rolling direction of spiral welded pipe coil is not perpendicular to the pipe axis direction, the crack resistance of the spiral welded pipe materials.

Electric resistance welded

Current is then passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without the use of welding filler material. Initially this manufacturing process used low frequency A.C. current to heat the edges. This low frequency process was used from the 1920’s until 1970. In 1970, the low frequency process was superseded by a high frequency ERW process which produced a higher quality weld.

Steel pipe for pipe technology, can be divided into (SML), mainly as the Oilfield internal transportation pipeline and small-diameter high-pressure natural gas pipeline, used for a small number of long-distance gas pipeline, the vast majority of long-distance pipeline with Direct seam high frequency (ERW), spiral submerged arc (SSAW), LSAW three (LSAW).

High Frequency Resistance Welding

A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond. Fins can be either solid or serrated (segmented). The weld produced in this process is a true forge, blacksmith weld. This type of weld is comprised of a fusion between two portions of parent metal without the introduction of a filler material. The weld is simply produced by heating the interfaces to be joined to a plastic state and applying pressure.

Used in boilers, furnaces and fired heaters for efficient heat recovery.

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.

The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors.

The residual defects in erw steel pipe ultrasonic testing is an important reason for failure of the weld, causing defects missed is inappropriate due to a probe parameter selection, disturbing wave effects and burr flaw echo echo does not distinguish between such a variety of factors.

Scrape the inside welds very smooth burr, weld and base metal transition very smooth. Usually a steel pipe wall thickness is 11.9mm, a thickness range of extrusion welds typically range from about 25mm to either side of each weld, the weld portion after the removal of burr than other parts of the base material thickness of about 10%.

ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes.

Straight seam welded steel pipe, according to welding process can be divided into high frequency resistance welding and submerged arc welding, longitudinal submerged arc welded is short for SAWL, high-frequency straight seam resistance welding is short for ERW.

Resistance welding is short of ERW steel pipe with number of advantages, such as high productivity, low cost, good dimensional accuracy, beautiful appearance. However, in the past, due to the poor reliability of the weld, great limitations on the use. The proportion of small pipe production.

Analysis of the frequency of inclusions in steel production, the pre-arc fusion inadequate inadequate edge fusion, central fusion deficiencies, stick welding, casting welding, porosity, skip welding and other welding defects nine common causes and preventive measures.

ERW pipe issues and defects is related to raw materials, production methods, process conditions, equipment status and personnel. Product defects that appear in the production process by the above factors and constraints.

Also known as the "skin effect," When an alternating current through a conductor, due to induction effect caused by the larger cross section of the conductor current distribution is uneven, the closer the conductor surface current density.

High-frequency electric resistance welding (ERW) steel pipe production, internal weld surface treatments are generally incomplete curettage (left weld reinforcement) and complete curettage (scraping will form the inner surface of the groove) in two ways, and the results were not ideal, will affect the overall performance of the steel pipe. Taking into account the thickness of ERW pipe welds, strength and reliability of ultrasonic testing, squeeze through thick welds - calibrating processing, optimized contour shape welds to improve the overall performance of ERW pipe.



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