The results of submerged arc welding are highly dependent on the properties and quality of flux. Fluxes for automatic welding are presented many and varied requirements. Flux should provide a good form of weld metal and the weld when welding high-performance, proper chemical composition, structure and high strength weld metal. In the weld metal should not form pores and cracks in particular, the stability of the arc should be sufficient slag crust should be easily removed from the weld surface after welding. When melting the flux should not stand in a lot of harmful gases and smoke, especially when welding in confined spaces inside boilers and tanks, etc. The flux should not be too hygroscopic; grain it must have sufficient mechanical strength, allowing multiple feed flux to the welding and cleaning nerasplavivsheysya of flux without excessive crushing of the grains and the formation of large amounts of dust, which reduces the quality of welding . Flux is filled to the place of welding thick, 50-60 mm. During the welding process melts only 20% of the flux, forming a slag crust, and the rest, has melted part of the flux must be removed and then re-used in welding. Modern fluxes for automatic welding are diverse in purpose, composition and properties. First of all fluxes can be divided according to the method of manufacturing processed. and neplavlenye. Cream manufactured by melting in a furnace, and they are usually more or less complex silicates, similar to the properties of glasses. The structure of fused fluxes can be administered only substances soluble in the melt without decomposing or volatile at the temperature of melting of flux, it is primarily oxides and metal halides. The role of the fused flux is limited to the creation of slag, a fairly passive in metallurgical terms. Neplavlenye fluxes represent a mechanical mixture of powdered and granular materials. They can enter any substance, regardless of their mutual solubility and stability at high temperatures: the free metals, ferro-alloys, carbonaceous matter, carbonates, etc. Therefore, neplavlenye fluxes can rapidly carry out various metallurgical processes alloying, deoxidation, modify, create a protective gas atmosphere in the welding zone, etc., are a powerful management tool for welding metallurgical processes and their regulation. At present, our industry uses mainly processed fluxes. After creating this book, the author of a fundamentally new type of neplavlenyh fluxes, known as ceramic, neplavlenye fluxes are increasingly used. Ceramic fluxes were primenyativ other countries in the U.S. they are called "agglomerated." By the nature of the slag distinguish acidic and basic fluxes. In content in the flux of manganese compounds and silicon fluxes distinguish high-and nizkomargantsovistye or silica, respectively, by the presence or absence of fluorine in the flux - or besftoristye fluoride, etc. By appointment distinguish fluxes for welding low-carbon steels, alloyed special steels, nonferrous metals, surfacing work, etc.
See also:
Automatic Arc Welding
Automatic ADS
Machines with a Constant Feed Rate of Electrode
Flux Equipment
Settings for Automatic Arc Welding
Automatic Submerged Arc Welding Introduction
Fluxes for Automatic Arc Welding
Processed Fluxes
Ceramic Fused Fluxes
Semi-Automatic Arc Welding
Arc Welding with Flux Cored Wire
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