Welding difficulty (1) easily oxidized. In the air, Hubei copper ash recycling, aluminum oxide combined with easy to produce a dense aluminum oxide film (thickness of about 0.1-0.2μm), high melting point (about 2050 ℃), far more than aluminum and aluminum alloys The melting point (about 600 ℃). Alumina density 3.95-4.10g / cm3, aluminum is approximately 1.4 times the surface of the aluminum oxide film of easy absorption of moisture, welding, it prevents fusion of the base metal, easy to form pores, slag, No fusion defects, performance degradation caused by welding. (2) easy to produce pores. Aluminium and aluminum alloys mainly blowholes during welding is hydrogen, since a large amount of liquid hydrogen can dissolve the aluminum, but hardly soluble solid aluminum hydroxide, copper ash recycling, so that when the bath temperature rapid cooling and solidification, too late to escape hydrogen , easy to gather the formation of pores in the weld. Hydrogen is difficult to completely avoid the holes, many sources of hydrogen, electric arc atmosphere of hydrogen, aluminum, wire surface oxide film adsorbed moisture in the air and so on. Practice has proved that, even if the argon gas by GB / T4842 standards, purity of 99.99%, but when the moisture content of 20ppm, there will be a lot of dense pores, Zhejiang copper ash recovery, when more than 80% relative humidity If measures are not taken heat, weld porosity will obviously appear. At the same time, using a small welding current slow increase weld cooling time, and use wire arcs puddle agitation, can better help the gas discharge bath. 1, charge handling charge before use should be treated by blowing sand to remove surface rust, grease and dirt. Place not long, relatively clean surface of aluminum ingots and metal type return charge may not be processed by the blow, but it should be mixed in the charge to eliminate iron filters and inserts, all of the charge in the blast furnace should be pre- heat to remove moisture attached to the surface, to shorten the melting time of 3 hours or more. 2, charge management and rational conservation and management of storage charge of alloy to ensure quality is important. Charge should be stored in the temperature changes little, dry warehouse. Hubei copper ash recovery | copper ash recovery | Sun Shine scrap metal recycling (view) recovered from the Linyi City Shengxin scrap metal Limited. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) is a professional, "scrap metal, alloy, machine aluminum, brass, wine together, miscellaneous aluminum, copper ash, zinc ash, zinc slag" of the company. Since its inception, we adhere to the "good faith, sound management" approach, the courage to participate in healthy competition in the market, so that the "lead ingots, scrap metal, alloy, machine aluminum, brass, wine together, miscellaneous aluminum, copper ash, zinc ash, zinc "brand has a good reputation. We adhere to the "service first, customer first" principle, so Shengxin scrap metal recycling scrap metal won in the public trust of customers, and establish a good corporate image. Special Note: This information is for reference only pictures and information, please contact us to obtain the most accurate information, thank you!