The industrial production of tubes and pipes began with the development of rolling mill technology in the first part of the nineteenth century. Strips of sheet metal were butt or lap weld in the same heat source. That was use to roll them into a circular cross-section, which was subsequently create by funnel arrangements or rolls (forge welding process).
Production quantities increased quickly with reputable stainless steel high frequency tube mill manufacturers over a short period as new methods for creating seamless tubes and pipes were widely accessible at the century’s close. Even though different welding procedures were used, seamless tubes and pipe eventually became the industry standard because of the continuous development and refinement of the seamless techniques.
After that time period, the welded tube’s fortunes improved thanks to the findings of welding technology studies, leading to an increase in research and development activity. And the widespread use of a broad variety of tube welding procedures. At now, welding accounts for around two-thirds of the world’s steel tube manufacturing. About a fourth of this total, however, is made up of what is known as “large-diameter line pipe” at sizes that aren’t practical for the seamless tube and pipe production.
Steel Pipe: The Variations Between ERW and HFW
HFW is a part of the ERW pipe production method. There are a variety of electric resistance welding methods, including low-, medium-, and high-frequency varieties; HFW refers specifically to the latter. EFW is a subset of the ERW process use for producing standard. And thin-walled steel pipe, which is one of the key distinctions between ERW and HFW.
Pipes that are join using electric resistance are refer to as ERW pipes.
High-Frequency Welding Pipe, or HFW Pipe.
Briefly describe the ERW steel pipe
Electric Resistance Welding (ERW) is the process through which steel pipes are made. The welding seam runs lengthwise. When electric current flows over the contact surface of the welding region during ERW pipe welding, heat is generate. It’ll become hot enough to bind the two steel edges together. Meanwhile, the edge of the pipe billet steel melted and extruded together due to the combined pressure.
The Practicality and Potential of ERW Steel Pipe
Low and high-pressure requirements may be satisfy using ERW steel pipe for the transportation of gaseous and liquid items like oil and gas. With the advancement of ERW technology, ERW steel pipe has been increasingly employee in several industries, including the oil and gas industries, the automotive sector, and many others.
Features that make ERW pipe superior
Advantages include little expenditure, minimal waste, minimal material, and straightforward mechanization.
Exactly what does “HFW steel pipe” mean?
To clarify, HFW pipe is a subset of ERW pipe.
Steel pipe classified as high-frequency welded (HFW) is an ERW pipe made with a welding current frequency of 70 kHz or higher. High-frequency welding resistance creates heat in the contact objects, melting any metals present and allowing for further processing, such as forging, to produce the desired alloy. In this context, HFW refers to a kind of heat energy that exhibits resistance from inside a solid. Two unusual phenomena, known as the skin effect and the proximity effect, are trigger. When a high-frequency current is pass through a metal conductor. HFW makes advantage of the skin effect to focus on the surface of a steel object. While proximity effects allow for precise regulation of the high-frequency electric current’s strength and direction of flow. Considering the rapid velocity, the contacting plate edge might be heat and melt in a short time. Then extrude during the docking process.
HFW pipes have several benefits
HFW steel pipes do not need the use of filler metal during welding. As a result, it is capable of high output rates and quick welding times. HFW pipe is often use in the oil and gas industry, as well as in the construction industry for a broad range of structural and mechanical applications. However, various variables, including raw material and method, might impact the quality of HFW steel pipes. And it’s becoming harder to keep an eye on the quality of the finished product. As a result, there is still room for development in both yield and welding techniques.
Comparison between ERW and HFW steel pipe
Knowing how ERW and HFW welding differs is the first step.
The resistance of the join metals to the passage of the welding current is the source of the heat use in the ERW welding process. To electrify the whole surface of the steel plate or coil to the length of welding, a high current is require. Welding using ERW uses a 50/60 Hz electric current that travels the length of the whole conductor.
The high frequency ss tube mill technique is distinct from high-frequency welding in that just a localised area of steel is heated by the induction of electric coils. Both alternating current and direct current may be use to create high frequencies. Welding generators that operate at a constant current or constant voltage and frequency are employee for these tasks.
The frequency range of a constant current welding machine’s output is 100 kHz to 800 kHz. Triode and tank circuits were use in earlier techniques to transform 60 Hz, AC current into HF. The latest welding machine incorporates field-effect transistors made from metal oxide silicon, a technology often used in conjunction with a parallel resonant circuit. The generators in the constant voltage variant are insulate gate bipolar transistors that can power about 2000 kW between 100 and 600 kilohertz.
Conclusion
Commonly, steel pipes that have been weld together using resistance are refer to as ERW. Welding falls into one of two categories, either alternative current (AC) welding or direct current (DC) welding (DC). AC welding may be broken down into low-frequency, moderate-frequency, ultra-frequency, and high frequency categories base on the frequency being use. Standard or thin-walled steel tubing is ideal for high-frequency welding (HFW). Welding processes such as induction welding and contact welding are include. Welding using direct current is the norm when working with steel tubes of a low caliber. High-frequency welding (HFW) is one of many ERW manufacturing processes. As a result, HFW steel pipe is include in the category of ERW steel pipe.
