Welding Helmet: How it works

Welding is one of the most hazardous occupations in construction because of the daily ability of workplace wound from burns as well as electricity. Traditionally, injuries from welding activity such as: eye burn, blinding and diminished vision, damage respiratory parts or electric shocks are common. For that reason, a welder is recommended to always wear a welding helmet in order to prevent those dangers. Spending more on a welding helmet is going to raise comfort, encourage your welding capacity, result in higher quality welds and ensure your safety.

An auto darkening helmet will help the welder prepare the work surface easily and be free of problem when starting welding. The lens of an auto darkening helmet will automatically darkens when Arc radiation appears. Unfortunately, selecting a helmet can be confusing if you do not update the latest auto-darkening lens technology.

Now, we will discuss what components are found in auto darkening welding helmets and how those components work together. As a result, you will know to choose the best welding helmet for you.

Source: learningfrontiers.eu

An auto darkening welding helmet has three main components: IR/UV Filter, liquid crystal cell, and polarization filter.

  1. IR/UV Filter:This filter is designed to remove and absorb99.9 % infrared (IR)ultraviolet (UV) radiation. It is a UV- and IR-coated dark-tinted glass with metallic layers, mainly 5 silver layers and 6 layers of aluminum oxide with a fixed shade value, usually #10.The layers of glass used in the ADL filter imbibe quite much the noxious longer wavelength UVB radiation.As a general rule,the auto darkening lens (ADL) works active or not base on it.
  2. Liquid Crystal Cell: LC cells have the ability to turn the light. When fluid crystals are lying smooth, they turn the light by 90 degrees. Yet, if the LCC’s are elated by electricity you can adjust them to determine how far you want to bend the light; even to the point that they don’t refract the light at all.

  1. Source: thefabricator.com

    Polarization Filter: It is used in conjunction with other components to darken the visible light. The earliest two polarizeson the right are arranged in the same orientation while the polarizer closest to the UV/IR purify is at a 90 degree tilt collated to the other 2polarizes. Thus, if you look through the lens, the light is going to be backer or lighter due on the orientation of polarizes .If you take a look through 2polarizes at 90 degree angle, they are at their darkest. With polarizes ordered in the similar orientation, they are going to only darken the light slightly.

Once you understand the components of welding helmet and their roles, you find it easy to know how it works totally. You will notice that two polarizing filters which are nearest to your eye, they are arranged in the same orientation. When switching off, the polarized light will be twisted to an angle of 90 degrees by the liquid crystals between the polarizing filters. This lead to the lens will have a dark shade of 5-6, and the eye will be protected from very bright light. When it is switched on, the first two polarizes on the LC panel with un-twist the light waves that have been polarized and the lens will drop down to shade of 3.

After comprehending how the welding helmets work, you should know how to use it in the right manner. First of all, it is advised to set your helmet to the preferred settings on a clean surface with the purpose of avoiding the lens’ interference. Then, lift the front part of welding helmet and then test the battery’s state. The following step is adjusting the shield delay time, which refers to the amount of time your welding helmet will take to change from dark to lighter state. You can adjust from 0.25 to 0.35 seconds or the slower setting (from 0.6 to 0.8 seconds) by using the fast setting.

However, you might be overwhelmed because of setting the auto darkening controls. We would like to give you some basic setting tips to help you avoid confusing.

  • Shade:It is the density of your darkening shield with the settings range from 1(clear) to 10 (totally dark). You might alter the shade based on the intensity of the light being emitted.
  • Delay:This is the speed at which you can set up the period of time before the lens be bright again after finishing the welding arc. It is your preference to set the fast or slow delay
  • Sensitivity: This is the degree of light that will be required in order to engage the shade. The brighter the light is, the darker the shade will be, and vice versa.

From the above discussion, the functionality of your welding shield will depend on your preference. The location or environments are core factors of your settings. Normally, keeping a default setting of 10 is the best option. Besides, when you buy a new helmet, or your company gives you a welding helmet, you make sure that the manufacturer manual book is provided. Read it carefully and in details to understand the components of your helmet and how it works. Remember this sentence: Safety first.