Welding--Harms of argon arc welding on human body
and protective measures
There are three aspects of the harmful effects of argon arc welding on human body:
(1) The cesium in the radioactive strontium tungsten electrode is a radioactive element, but the tungsten argon arc welding has a small radiation dose, and within the allowable range, the damage is not harmful. . If radioactive gases or particles enter the body as an internal source of radiation, it can seriously affect your health.
(2) High-frequency electromagnetic field When high-frequency arc striking is used, the intensity of the high-frequency electromagnetic field generated is between 60 and 110 V/m, which is several times higher than the reference hygienic standard (20 V/m). However, due to the short time, it has little effect on the human body. If the arc is frequently started, or if the high-frequency oscillator is used as a arc-stabilizing device during the welding process, the high-frequency electromagnetic field can be one of the harmful factors.
(3) Harmful gases - ozone and nitrogen oxides During argon arc welding, the temperature of the arc column is high. Ultraviolet radiation intensity is much greater than general arc welding, so a large amount of ozone and oxynitride are generated during the welding process; especially the concentration of ozone far exceeds the reference sanitary standard. If effective ventilation measures are not taken, these gases have a great impact on human health and are the most important harmful factors for argon arc welding.
(1) Ventilation measures The argon arc welding work site should have good ventilation to discharge harmful gases and smoke. In addition to the ventilation of the plant, several axial fans can be installed to vent the outside air where the welding workload is large and the welding machine is concentrated. In addition, local ventilation measures can be used to remove harmful gases around the arc, such as the use of open arc exhaust hoods, exhaust torches, and portable small fans.
(2) Protective ray measures As far as possible, strontium tungsten electrodes with extremely low radiation doses are used. For the processing of tantalum tungsten and tantalum tungsten, seal or drafting wheel grinding should be used. Operators should wear personal protective equipment such as masks and gloves. Wash hands and face after processing. The tantalum tungsten and tantalum tungsten should be stored in an aluminum box.
(3) Measures for protection of high frequency argon arc welding In order to prevent and weaken the influence of high frequency electromagnetic field, the measures taken are as follows: 1) the workpiece is well grounded, the torch cable and the ground wire are shielded by metal braided wires; 2) the frequency is appropriately reduced; 3) Try not to use the high-frequency oscillator as a stabilizing arc device to reduce the high-frequency electric action time. (4) Other personal protective measures During argon arc welding, due to the strong action of ozone and ultraviolet light, it is advisable to wear non-cotton overalls (such as acid-resistant, silk, etc.). In the case where the container is welded and local ventilation cannot be used, personal protective measures such as a blower helmet, a blower cover or a respirator can be used.