non auto darkening welding helmets are tools that play a role in protecting the safety of operators during welding and cutting operations. It is a high-tech product that integrates optics, electronics, ergonomics and material science. The use of high-quality LCD and glass-plated combination for the shading lens, the lens of the light-sensing system can instantly detect the generation and disappearance of arc light when welding, quickly drive the LCD body shading color change to achieve safe and effective filtering of harmful light, so as to protect the welders' eyes and face to avoid the harm of arc light radiation.
Non-auto darkening welding helmets have many advantages over traditional black glass welding masks, especially in terms of improving welding quality, reducing welding costs, reducing welders' training costs and reducing welders' occupational hazards. Response time, light stability and reliability, optical performance of the filter screen, power consumption, and wearing comfort are the key factors to consider when choosing auto darkening welding masks. non auto darkening welding helmets have a positive impact on the improvement of welding quality, welding efficiency and occupational protection of welders.
In the use of traditional black glass welding mask conditions, the causes of injury to welders are: first, the arc initiation process, some welders usually use bare-eye arc to avoid deviation of the weld joint, although there is a physiological blink reflection protection, but the arc of the moment the direct effect of arc light can not be completely avoided; second, the existence of multiple simultaneous welding operations in the environment, the cross-radiation of welding arc light; third, the reflection and scattering effect of arc radiation, the impact on the welders.
Variable light filter usually includes control circuit, arc light detector, outer protection sheet, ultraviolet and infrared filters, light valve, inner protection sheet and other structural components. When the welding arc is generated instantly, the light filter screen can automatically convert the shading number from a lower value to a higher value, in order to protect the operator; when not welding is a bright state shading number state, it is easy for the welder to observe the welding parts to prepare for welding; when the welding stops, the filter from the dark state shading number back to the bright state shading number, the welder can clearly observe the welding effect and prepare for the next welding operation.
The UV and IR filters placed on the inside of the outer shield have permanent protection against IR and UV radiation regardless of whether the control circuit of the weld cap is working properly, which is equivalent to the protection against IR and UV radiation of a filter with a shade number of 12 or 13. In evaluating the performance of autochromatic filters, the effective field of view, response time, sensitivity, delay settings, light state shading number, dark state shading number, power consumption, circuit immunity, and the optical performance of the filter screen and other parameters must be paid attention to, in addition to the convenience of maintenance is also an important factor.
Response time is non auto darkening welding helmets an important parameter, refers to the automatic light filter screen light state, from the arc light detector to accept the arc light signal to the light valve completely to the intended dark state required time, the response time is the shorter the better. Because the response time is related to the welders arc by the strong visible light instantaneous exposure to the degree of injury, the shorter the response time, the faster the light valve from the light state to dark state, the welders by the possibility of injury is smaller. In the process of transition from the light state to the dark state, the performance of the liquid crystal material and the response time of the control circuit will directly affect the response time of the light changing screen.
Arc light detection sensor is the light screen from the light state shading number to the dark state shading number change of the trigger device, its response characteristics and reliability will directly affect the stability and sensitivity of the work of the welding filter screen, especially in the case of small to 1 amp or even smaller stable welding current and by other operators arc welding interference in the environment.
The non-auto darkening welding helmets, which are set up with a delay from the darkening to the brightening shading number, reduce the impact of the strong afterglow of the incandescent pool on the welders' eyes.
The non auto darkening welding helmets have a bright shade of 4 at power on, so the welder can clearly observe the weld area, accurately locate the weld area, and avoid the interference of the surrounding welding arc light; when the arc light detector detects the start of the arc, it will switch from the bright shade to the pre-set dark shade in a very short period of time, protecting the welder from the arc light. The use of non-auto darkening welding helmets avoids blind welding and has positive significance in ensuring the accuracy of welding operations, protecting the flatness and finish of non-welded surfaces, improving welding quality, reducing welding costs and reducing the cost of welder training.