EFW Steel Pipe

Electric Fusion Welding Pipe(EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the work piece so that the work piece leaving the melt, the formation of the weld. lt is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys. Deep penetration welding fast, heat-affected zone is extremely small so small performance impact on the joints, the joint almost no distortion. But EFW welding steel pipe has a requirement on a special welding room because welding using X-rays.

EFW Pipes and Tubes Material & Grades:

Stainless Steel EFW Pipes & Tubes: ASTM A - 270, 249, 312, 269, 213, 268, 358 304, 304L, 316, 316L, 317L, 321, 316 Ti, 309, 310, 904L, 410, 420, 430, 431, 202, etc

Carbon Steel EFW Pipes & Tubes : ASTM A106, IS1239, IS3589, Api 5L, ASTM A106, IS1239, IS3589, Api 5L.

Alloy Steel EFW Pipes & Tubes : ASTM A691, ASME SA691, CM 65, CM 70, CM 75, CMSH 70, CMSH 75, STM A691 Grade 1CR Grade-12, 1.1/4CR Grade 11, 2.1/4CR Grade 22, 3CR Grade 21, 5CR Grade 5, 9CR Grade 9, Grade 91.

Application:

1. Pressure pipes

2. Oil Pipe, Gas pipes

3. Fluid Pipe, water pipe

4. Boiler Tubes

5. Structure Pipe, construction pipe

6. Fertilizer tube

Specification:

Specifications	Range
Out Diameter	Φ350mm- Φ2400mm
Wall Thickness	6mm-80mm
Length	2.0m-12m

Standard:

ASTM A53	Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
API 5L	Specification for Line Pipe(Two levels PSL 1 and PSL 2 of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.)
A252	Standard Specification for Welded and Seamless Steel Pipe Piles
A500	Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
A139	Standard Specification for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over)
A672	Specification for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
A691	Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures

In EFW welding process, the external high energy electric arc is used to create a weld joint. Once the welding is done, the excess weld material from outside and inside of the pipe is removed with the help of trimmer tools.
In general, to reduce the negative effect of welding, a localized heat treatment of weld seam is carried out immediately it clears online ultrasonic test. Normally an induction heating method is used to restore microstructure of welded zone. These type of heat treatment is known as post annealing. In next stage, the pipe will go through Hydro testing, visual and dimensional inspection and once certified by inspection engineer it will send for packaging.