There are various types of welding processes available for steel pipes and tubes. ERW or Electric resistance welding is one among them. Let’s understand more about the ERW process, ERW pipes, and tubes.
What is ERW pipe?
ERW pipe is a steel tubular product that has been welded using an Electric resistance welding process. Electric resistance welding is the process of joining metal parts together permanently by heating them with an electric current and melting them at the joint.
How is ERW pipe made?
An ERW pipe is made by cold-forming a flat steel sheet into a cylindrical shape and the edges are fused together by passing an electric current. The two main types of ERW processes are
- High frequency welding
- Rotary contact wheel welding
High frequency welding
In high frequency ERW welding, a high frequency A.C current is passed through the edges of the metal parts. High frequency ERW welding is commonly used in ERW pipe manufacturing processes. It yields better bonding and crack prevention compared to low frequency ERW processes.
Rotary contact wheel welding
In rotary contact wheel welding, an electric current is passed through a contact wheel at the weld point. This contact wheel applies some forge pressure needed for the welding process.
Features and uses of ERW pipes
- Since there are no fusion materials used in the ERW process, the resulting product is clean and the weld seam cannot be seen or felt.
- The installation of ERW pipes is very easy because of its high dimension precision;
- ERW tubes are used for engineering purposes, fencing, scaffolding, automobile sector, water and gas conveyance, agriculture, etc.
What next?
At Melsteel, we have a range of ERW pipes and tubes in round, square and rectangular shapes. Buy them online or contact us on 03 8794 3100 or send us an email at buysteel@melsteel.com.au and our customer service team will be happy to assist you!
