TM2000 Gas Welding Lens

The TM2000 in use while welding aluminum - as seen in the streaming video clip

welding aluminum - 1:20s - 969KB

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The oxy-fuel welding and brazing process will join a wide variety of metals and, with the addition of certain fluxes, the torch can be used to join a far greater number of metals without the use of expensive, bulky equipment.

The strong yellow-orange flare given off by many of these fluxes is due to the presence of sodium and potassium salts. The visual impact of this flare makes it difficult to achieve a fine bond or joint without severe eyestrain, headaches or vision loss.

In the accompanying graph the area bounded by the curve labeled "visual response'' determines where the eye is most sensitive. This area of eye sensitivity is only part of theentire visible spectrum which stretches from 380 nanometer to 740 nanometers. On either side of the visible spectrum are the ultraviolet and infrared wavelengths. The vertical lines labeled potassium, sodium arid lithium present a virtual forest of wavelengths to dodge or filter out. The small curve from 480 nanometers to 580 nanometers does just that. This curve and the area within it represent the window provided by the TM2000 lens.