Soldering gun

When the primary of the transformer is energized, several hundred amperes of current flow through the secondary and very rapidly heat the copper tip.

They can be used for heavy electrical connections, stained glass assembly, and light sheet-metal work.

The soldering gun generates an electromagnetic spike when the button is released, which can be a problem for electromagnetically-sensitive devices.

The heavy magnetic field produced by the tip can attract and hold small ferrous metal pieces (screws, etc.).

In 1941 Carl E. Weller invented and later obtained U.S. patent 2,405,866[1] for a transformer-based soldering tool which heated and cooled rapidly,[2] essentially as described in this article.