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The temperature-controlled WELLER W-series soldering irons are suitable for a broad range of demanding soldering applications on electrical components with extremely high heat sensitivity and are therefore ideal for use in industrial production and for maintenance work on electrical appliances. The industrial soldering irons of the W series have a solidly constructed heating element and a wide selection of “Longlife” soldering tips. The various power classes 60 W, 100 W, and 200 W provide the solution to a multitude of different soldering tasks. Temperature is controlled according to the WELLER Magnastat principle.

If the tip is cold, the permanent magnet is attracted by the ferromagnetic temperature sensor. This actuates the switch. As the sensor approaches the Curie point, it loses its ferromagnetic properties and can no longer hold the permanent magnet. The magnet is released and the switch returns to its off-position (the power supplied to the heating element is interrupted). If the tip cools slightly, the temperature sensor attracts the permanent magnet and power is supplied once again. The temperature sensors (Magnastats) have an extremely narrow distribution of switching temperatures and are not subject to any wear resulting from ageing or material fatigue.