Leaving aside the description of welding techniques that you will certainly know if you have come across in these pages, we will focus on the techniques of extraction and purification of fumes<\/strong> in particular on those defined located at the source as required by the legislator and recommended by good plant engineering technique.<\/p>\n In welding<\/strong> work<\/strong> of MIG stainless steel or continuous wire, welding fumes and micro-dust often contain particles of chromium, manganese and nickel inside.<\/strong><\/p>\n The most dangerous, if inhaled, are the chrome ones.<\/em><\/p>\n In particular, the hexavalent form of chromium, present in several compounds of industrial origin “on the basis of experimental and epidemiological evidence has been classified by the IARC as a carcinogen for humans (class I)”.<\/p>\n We conclude this paragraph a little terrorist remembering that most of the harmful substances and particulates contained in welding fumes measure at source 0,01\u00f70.1 microns, this means that they are easily inhaled and can penetrate into the lungs and even, if with prolonged exposure, into the blood.<\/strong><\/p>\n Also the Italian legislator obviously deals with the subject and does it in a very precise way in spite of those who think that there are no directives for this type of pollutants produced by such widespread processing in mechanical workshops.<\/p>\n The obligations and preventive measures provided for in Legislative Decree no. 81\/2008<\/strong> are those of reference for welding fumes, in particular since in this article we deal with the subject, we point out what is indicated in Annex IV.<\/p>\n “Requirements of the workplace”:<\/em><\/p>\n 2.1.5. The extraction of gases, vapours, odours or fumes, as far as possible, must take place immediately near the place where they are produced.<\/em><\/p>\n The technology applied to the development of safety equipment and filtration systems in recent years has greatly simplified the work of technicians who are sizing plants or systems for suction and purification of welding fumes.<\/strong><\/p>\n Compared to the 70s and 80s, in fact, the technical approach to this type of suction has increasingly seen the use of suction arms<\/strong> or flexible pipes at the expense of “hoods and capons” that were typically installed above the operator\u2019s head resulting in pre-inhalation of fumes even before they were aspirated.<\/p>\n This product as we said has for many years the monopoly of localized or close solutions because thanks to its “self-lift” or the ability to remain suspended in mid-air, it can be placed very, very close to the emission of fumes and when connected to a properly sized suction system ensures the protection of the respiratory tract by sucking almost all the fumes produced, as can be seen from the video below, made at a metal carpentry.<\/p>\nLet’s remember why we need to aspirate them at the source<\/h3>\n
Close suction, the regulations<\/h3>\n
Localized suction, the best techniques<\/h3>\n
The suction arm, the ideal solution<\/h3>\n