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GIVING THE NOD - Wearing a welding helmet doesn't have to be a pain in the neck

机译：打点头-戴好电焊帽不一定会给脖子带来痛苦

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摘要

AUTODARKENING helmets have high-speed phototransistors that detect the light from a welding arc, and then quickly darken the helmet lens to allow the welder to view the arc safely. Autodarkening lenses use liquid crystal display (LCD) technology, similar to that found in flat-panel televisions and cell phones. The time it takes the sensors to register the light from the arc to the time the lens darkens is between 0.05 and 0.28 millisecond (depending on the helmet), which is up to 2,500 times faster than it takes to blink your eye (the average blink lasts 100 to 150 milliseconds). Additionally, multiple sensors located around the perimeter of the lens are important to ensuring protection in certain applications, such as low-amperage gas tungsten arc welding (GTAW) and out-of-position welding in which one sensor may be obstructed.
机译：AUTODARKENING头盔具有高速光电晶体管，可检测来自焊接电弧的光，然后快速使头盔镜片变暗，以使焊工可以安全地查看电弧。自动变暗镜片使用液晶显示器（LCD）技术，类似于平板电视和手机中的技术。传感器记录到弧光的时间到镜头变暗的时间在0.05到0.28毫秒之间（取决于头盔），比眨眼（平均眨眼）快2500倍。持续100到150毫秒）。另外，在镜头周边周围设置多个传感器对于确保某些应用中的保护非常重要，例如低电流的钨极氩弧焊（GTAW）和错位焊接（可能会阻塞一个传感器）。

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