Press

What is Electric Fusion Welding (EFW) and Electric Resistance Welding (ERW)?


Electric fusion welding (EFW)is the combination of metal and metal by heating one or several consumable electrodes and the workpiece. Resistance welding is a welding process that uses a strong current to pass through the contact point between the electrode and the workpiece to generate heat from the contact resistance.

The arc of electric fusion welding melts the metal and the filling material fully, and does not need to pressurize, and the filling metal part comes from the electrode.

Electric resistance welding (ERW)is a type of welding method that uses resistance heat as an energy source, including electroslag welding that uses slag resistance heat as an energy source and resistance welding that uses solid resistance heat as an energy source.
Resistance welding often uses a large current. To prevent arcing on the contact surface and to forge the weld metal, pressure is always applied during the welding process.

Extended data:

Welding achieves the purpose of joining through the following three ways:

1. Fusion welding
The workpieces to be joined are heated to melt them locally to form a molten pool. After the molten pool is cooled and solidified, they are joined. If necessary, a filler can be added to assist. It is suitable for welding of various metals and alloys without pressure.

2. Pressure welding
The welding process must exert pressure on the weldment and belongs to the processing of various metal materials and some metal materials.

3. Brazing
A metal material with a melting point lower than that of the base material is used as the brazing filler metal, and the liquid brazing material is used to wet the base material, fill the joint gap, and mutually diffuse with the base material to realize a link weldment. Suitable for welding processing of various materials, and also suitable for welding processing of different metals or different materials.



New service from OilVoice
Trip Shepherd is for companies who need to track their staff in areas of risk.
It's free to use, so we invite you to try it.

Visit source site

https://permanentsteel.com/newsshow/differences-be...

Electric Resistance WeldingERW pipeEFW pipe

More items from lvy


How to Maintain Oil Casing Pipe

At present, many oil companies are protecting oil casing pipe , and do not allow the use of wear-resistant belts. So how to repair the casing problem? Many drilling companies have tried many methods to remove the toughness of the tungsten carbide of the drill pipe. In the welding process of the wea ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 13 days agoPress > casing pipeOil and GasMaintain

The Technological Development Process of ERW Steel Pipes at Home and Abroad

High frequency straight seam welded pipe (ERW) is the hot rolled coil plate formed by the forming machine, using the skin effect and proximity effect of high frequency current to heat and melt the edge of the tube blank, and pressure welding under the action of the squeeze roller To achieve product ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 20 days agoPress > erw steel pipeTechnological DevelopmentHome and Abroad +1

Corrosion Mechanism and Anti-corrosion Process of Oil Well Casing

The damage to the wellbore structure of oil fields and water wells not only affects the normal production of damaged wells, but also affects the normal development of adjacent wells and even blocks, and poses a great threat to the stable production of the entire oil field. The main factors that caus ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 20 days agoPress > well casingAnti-corrosion ProcessCorrosion Mechanism +1

Anti-corrosion Process of Oil Casing Pipe

Corrosion of oil casing is related to factors such as partial pressure of corrosive gas, ambient temperature, water content, salinity, flow rate, pH value and so on. So what are the anti-corrosion processes of the oil  casing pipe ? Let 's take a brief look: 1. Cement sealing anticorrosion skills I ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 23 days agoPress > casing pipeAnti-corrosion Processmining industry

Seamless Steel Pipe Market Is Not Optimistic Under the COVID-19

Under the COVID-19 epidemic situation, the seamless steel pipe market is not optimistic, and the production rhythm must not be chaotic. With the effective control of the new coronary pneumonia epidemic in China and the accelerated pace of resumption of production and production, the fundamental p ...

lvy lee - Permanent Steel Manufacturing Co.,Ltd


Posted 25 days agoPress > covid-19Seamless steel pipeSeamless Steel Pipe Market
All posts from lvy