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3M Welding, Speedglas

What is Speedglas Auto-Darkening?

In 1981 we turned the world of welding on its head by introducing the first commercially-viable auto darkening welding filter (ADF). Ever since then, the Speedglas™ brand and the technology behind it has been the standard to which others aspire.

How ADF's work?

Before Welding During Welding After Welding
Before welding

With the shield in the safe down position, the welder has a clear view through the welding filter. Both hands are free and the electrode can be precisely positioned.

   During welding

Within 0,1 milliseconds of the arc strike, the filter has switched to the dark state.

   After welding

The filter automatically returns to the clear state after welding is complete, allowing for immediate and safe inspection of the weld pool, as well as the preparation for the next weld.