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A ERW welding process refers to the generation of heat caused by the resistance of current flow through the jointed metals in ERW welding. Thus, e r w a high current is needed to electrify the entire surface of the steel plate or coil to the length of welding. A 50/60 Hz electric current is passed through the entire conductor during the ERW welding process.

The HFW welding process differs from the high-frequency welding process in that only a portion of the stainless steel abbreviation metal is heated by induction from an electric coil. High-frequency welding is done either with AC or DC current. Constant current welding generators and high-frequency welding seam pipe generators are used in these cases.

A constant current welding machine is able to generate power at 100-800 kHz. The older processes were used to convert 60 Hz, AC current into high frequency current using triodes and tanks. A new welding machine utilizes metal oxide silicon, field-effect transistors usually connected to parallel resonance circuits, with the conversion of 60 Hz, AC current to high frequency current. In the constant voltage version, insulated gate bipolar transistors are used to produce about 2000 kW of power and with frequencies between 100 and 600 kHz.

There are two distinct features of HF current than 60 Hz line current:

It should be noted that while the 60 Hz line frequency current flows through the entire conductor, the HF current flow only on the surface of the conductor, so it is called the “skin effect ”.

When two conductors carrying HF current are placed close to one another, the current concentrates on the surfaces of the conductors next to each other, this is called the “proximity effect ”.

There is a specific distribution of the HFW current that occurs on both sides of the metal conductor, i.e. the current flows mainly along the sides of the metal conductor. Both conductors are close to one another, and the majority of the HF current flows on the adjacent sides of the metal conductor.

ERW steel pipes made from API 5L PSL2 require HFW

It is a mandatory requirement for ERW steel pipes according to API 5L and ISO 3183 specifications to use HFW welding as a welding method for PSL 2 pipes erw tube mill process welded in a welded process. As it is an improvement from the inherent problems of hardness, lack of fusion and susceptibility to stress corrosion cracking (SCC).

ERW steel pipe includes HFW steel pipe

As the name implies, ERW is a general term describing resistance welded steel pipes. There are two types: alternate current welding (AC), as well as direct current welding (DC). AC welding can be divided into four types based on their frequency. Low frequency welding, intermediate frequency welding, ultra frequency welding and high frequency welding are the four types of AC welding. In the construction of ordinary or thin wall steel pipes, high frequency welding (HFW) is commonly used. It consists of contact welding and induction welding. A direct current welding process is generally used for the processing of small caliber steel tubes. steel pipe manufacturers However, high frequency welding (HFW) is considered to be one of the production methods of ERW steel pipe, which adopts the process of high frequency welding.

What is ERW steel pipe?

Differences between ERW Steel Pipe and HFW Steel Pipe

A steel pipe that is ERW is manufactured by using electric resistance that varies from low to high frequency. The welding seam is longitudinal. The explain the difference between milling and welding electric current generated by the welding process jsw plumbing and electrical will cause the heat to be produced when it flows through the contact surface of the welding area. As a result, the edges of the steel will be heated to the point that they can form a bond. During the process, the edge of the pipe billet steel would melt and extrude together with the combined pressure.

In an ERW process, what kind of pipes (standards) could be produced

Stainless steel ERW pipe/tube standards and specifications

ASTM A269 stainless tube

ASTM A312 Stainless pipe

ASTM A270 sanitary tubing

ASTM A790 ferritic/austenitic/duplex stainless pipe

Carbon steel pipe in ERW

ASTM A53 Grade B and A (and Galvanized)

ASTM A252 pile pipe

ASTM A500 structural tubing

EN 10219 S275, S355 pipe

ASTM A134 and ASTM A135 pipe

API ERW Line pipe

API 5L B to X70 PSL1 (PSL2 shall be in HFW process)

API 5CT J55/K55, N80 casing and tubing

And etc.

ERW steel pipe application and usage

It is possible to use ERWstainless steel pipe suppliers pipes to transport gas and liquid objects such as oil and gas at low and high pressures. The development of ERW technology over the last few years has resulted in more and more ERW steel pipes being used in the oil and gas industry, automobile industry, and so on.

The advantages of ERW pipes

High efficiency, low cost, material saving, easy automation.

 

What is HFW steel pipe?

Differences between ERW Steel Pipe and HFW Steel Pipe

I would like to point out that HFW pipe can be regarded as a type of ERW pipe.

An ERW pipe that has been produced with a welding current frequency of over 70 kHz (high frequency welding) is referred to as a high frequency welding pipe (HFW). A high-frequency welding resistance is generated by the heat generated in the contact object,seamless pipe so that the objected surface will be heated to a plastic state, then forging can be done in order to achieve a combination of steels. Solid resistance heat energy is known as HFW. In the event that a high frequency current passes through a metal conductor, two peculiar effects are produced, the skin effect and the proximity effect. In the HFW process, skin effects are used to concentrate the electric current flow path on the steel object surface, and proximity effects are used to control the high-frequency electric current flow path’s position and power. The speed at which the plate is contacted is very high, which makes it possible to heat and melt the edge of the plate on shore during docking time.

Advantage of HFW pipe

The HFW steel pipes do not need to be filled with filling meta during welding, so they can be welded quickly and efficiently. The HFW pipe is widely used for a wide range of applications such as oil and gas transportation, oil well pipelines, building structures, as well as a variety of mechanical pipes. Although the HFW steel pipe quality is affected by many factors, such as raw material and erw carbon steel pipe manufacturer process, it becomes very difficult to control the quality of the steel pipe during production. Consequently, the yield and welding process still need to be improved continuously in order to achieve the best results.

Welding Processes of the ERW and HFW

As a result of the electric resistance welded to current flow that passes through the jointed metals during the ERW welding process, the heat generated is known as the ERW welding process. ERW welding requires a large current to electrify the entire surface of the steel plate or coil for the length of the welding process, so 50/60 Hz is used for the electric current.

The HFW welding process differs from the high-frequency welding process in that it only heats a section of the steel metals with the induction of an electric coil. High-frequency welding occurs when either AC or DC currents are used to generate the high frequency. In these cases, there are two types of generators. One of them is a constant current welding generator. One of them is a constant voltage high-frequency welding generator.

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