We are a leader in manufacturing of tube mills and other allied machinery's and equipments and it has developed a new process of designing, engineering, manufacturing and installing the equipments. Nirmal offers tube mills up to 20 diameter which are high-speed automatic continuous running that produce the wider range of quality steel tubes and pipes. In addition the company offers other machinery's viz. slitting, threading, end-facing, galvanizing plant, hydro testing and cut to length. Almost 90% of the tube makers in India are the users of the Nirmal products.

The two HF welding processes are HF contact and HF induction. In both processes, the equipment that provides the electrical current is independent from the equipment that supplies the forge pressure. Also, both HF methods can employ impeder's, which are soft magnetic components located inside the tube that help to focus the weld current in the strip edges.

In HF contact welding, current flows through the contacts and into the unfinished tube. The current takes the path of least resistance, flowing around the open V, creating a build up of heat at the apex. This is where the welding occurs.

HF Contact Welding: HF contact welding transfers weld current to the material through contacts that ride on the strip. The weld power is applied directly to the tube, which makes this process more electrically efficient than HF induction welding. Because it is more efficient, it is well-suited to heavy-wall and large-diameter tube production. HF Induction Welding: In the case of HF induction welding, the weld current is transmitted to the material through a work coil in front of the weld point. The work coil does not contact the tube-the electrical current is induced into the material through magnetic fields that surround the tube. HF induction welding eliminates contact marks and reduces the setup required when changing tube size. It also requires less maintenance than contact welding.

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