Is it possible to demagnetize a material?

When the reverse magnetic field reaches the intrinsic coercivity (Hcj) point, the permanent magnet is thoroughly demagnetized. Besides the former field demagnetization, there is another way to demagnetize a permanent magnetic material by increasing temperature which is called thermal demagnetization.

How do you demagnetize metal before welding?

Heat-treat the metal Use a heating process to heat the affected metal slowly. While doing so, use a gaussmeter to check the residual magnetism. When the metal reaches this temperature, it will demagnetize. Then let it cool down in an environment without magnetic fields.

Does heat demagnetize?

Like the strength of the magnet, heat affects the magnets in terms of resistance to demagnetization, which generally decreases with increasing temperature. The only exception are ceramic (ferrite) magnets, which are easier to demagnetize at low temperature and more difficult to demagnetize at high temperature.

What are the methods of avoiding demagnetization?

Store with a keeper Store your magnet with a keeper on the two magnetic poles. A keeper is a piece of iron that is temporarily added between the north and south poles of a magnet to prevent it from demagnetising. If a keeper is not provided with your magnet then store your magnets on a steel sheet.

How do you demagnetize stainless steel?

Steel can be demagnetized with a commercial demagnetizer, a hammer or by heating it to a very high temperature, known as the Curie temperature.

How do you demagnetize a pipe to weld?

One common method that I have used on pipelines in the oil and gas industry is to create a magnetic coil with the work lead. I wrap the lead around the pipe three to six times, about half the pipe diameter away from the weld groove on the opposite side from the direction of the arc blow pull.

https://www.youtube.com/watch?v=O1ndI7v_9XI