EFW pipe

EFW pipe

What is an efw pipe?

This pipe undergoes electric fusion welding or EFW for its production. It is the standard approach for piping with large diameters. An efw pipe gets manufactured by rolling the plates and welding the seam. The process involves heating the metal with electrodes. Then, the electric arc makes the weld. Using a longitudinal seam weld is the most widespread approach in aerospace, construction, automotive, etc.
The process does not require external pressure. However, you will need contact pressure if you use resistance welding. A subtype of EFW is GMAW or Melt Gas Shielded Welding. It encompasses extra protection from inert gases for a 316 stainless steel efw pipe. The procedure matches arc welding, but the overall performance is better.

EFW Pipe specification, dimensions, and size chart

EFW Pipe Specification

EFW Pipe Grades, Tolerances and Equivalent

Other grade list

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What does stainless steel hfw pipe mean?

ERW, or electric resistance welding, comprises low, medium, and high-frequency processes. A stainless steel hfw pipe uses high-frequency welding. It is a subtype of ERW that typically gets employed for thin-walled steel pipes. This technique uses the generated heat between the objects in contact (skin effect and proximity effect) to enable the connection in a super duplex efw pipe.
High-frequency welding, or HFW, comprises contact welding and induction welding. Here, the alternating and direct currents generate high frequencies. This type of welding uses a current generator and a welding generator.
This procedure is quick and efficient for a stainless steel 316l efw pipe. It gets used in oil and gas, wells, mechanical piping, etc. It is critical to control the quality of the production process to ensure a high-performing component.

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Are saw and EFW the same?

Submerged Arc Welding is a classic approach for piping. SAW is also an arc welding procedure, i.e., it is a subtype of EFW. It requires a continuous electrode stream. A super duplex 2507 EFW electric fusion welded pipe can get manufactured as LSAW (longitudinal) or spiral submerged (SSAW).
This method uses a conductive flux blanket that offers a pathway between the component and electrode. This technique can avoid sparks and is a safer approach. It can also limit fumes and radiation compared to a duplex 2205 EFW welded pipe.
While SAW and EFW are similar, it differs from ERW or resistance-based welding. It is difficult for it to achieve the high levels of production efficiency promised by ERW.

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What are the three types of stainless steel fusion welding?

Stainless steel pipes can get welded in various ways based on the required specifications and budget. The three most common types of a stainless steel efw pipe are TIG, resistance, and MIG.
TIG or tungsten arc welding is the best for thin piping. It uses argon, helium, hydrogen and nitrogen. This method can produce pipes with high corrosion resistance. In contrast, resistance welding uses an electrical current to seal a stainless steel 304 efw pipe. It is ideal for materials with low melting points. Finally, MIG welding uses an argon-based shield with helium, oxygen and carbon dioxide. It simplifies welding areas that may be difficult to reach in complicated installations.

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What is the difference between welding and electric fusion?

Both methods get employed in different industries to connect piping. The essential difference lies in the mechanism. Standard welding requires heat and pressure to reach the melting point. Here, acetylene is the typical gas used to generate the necessary heat.
Contrastingly, electric fusion enables joining by using electrical energy. The latter runs an electric current to generate the required heat for creating a joint. Here, the duplex stainless steel efw pipe gets heated by electrodes, and an arc gets used to make the weld. It has increasingly become popular because of its efficiency, safety, and cost-effectiveness.

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What are the four disadvantages of electric fusion welded pipe?

Fusion welding is a popular and inexpensive approach employed by many industries. However, it has a set of limitations. The primary drawback is that joining dissimilar metals is not straightforward. The materials differ in melting points and coefficients of thermal expansion, making welding tricky.
The second disadvantage of an efw stainless steel pipe is the residual stress from the solidification process. The materials can get damaged by heat or degrade in their mechanical properties. Finally, such piping develops a heat-affected zone in a 304L stainless steel efw pipe. It is a weak spot that can pose a problem if unattended.