tailieunhanh - The Welding of Aluminum & Its Alloys Part 4

Tham khảo tài liệu 'the welding of aluminum & its alloys part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Preparation for welding 55 Table Suggested parameters for plasma-jet cutting Metal thickness Plasma gas Gas flow l min Shield gas Gas flow l min Current amps Voltage volts Cutting speed mm min Method Air 98 4800 Manual Air 98 6300 Manual 3 Air 98 3000 Manual Air 98 1000 Manual N2 34 CO2 100 1800 Manual Ar H2 25 200 50 1500 Manual 10 N2 35 CO2 100 200 1250 Manual Ar H2 28 280 55 1000 Manual 25 Ar H2 33 330 70 500 Manual 50 Ar H2 45 400 85 500 Manual 6 Ar H2 55 300 140 7500 Mechanise 6 N2 32 CO2 100 115 1800 Mechanise 10 N2 32 CO2 100 120 900 Mechanise N2 32 CO2 100 120 480 Mechanise N2 32 CO2 100 300 3200 Mechanise Ar H2 60 300 140 5000 Mechanise 25 N2 70 CO2 100 400 1800 Mechanise 25 Ar H2 60 375 160 2300 Mechanise 50 N2 32 CO2 100 400 800 Mechanise 50 Ar H2 60 375 165 500 Mechanise 75 Ar H2 95 420 170 380 Mechanise 75 Ar H2 45 N2 100 400 500 Mechanise 75 Ar H2 45 N2 100 700 650 Mechanise 100 Ar H2 95 450 180 750 Mechanise 125 Ar H2 95 475 200 250 Mechanise mm argon-hydrogen is regarded as the best choice for the plasma gas this gas mixture giving the best quality cut irrespective of thickness. The secondary cutting gas may be carbon dioxide or nitrogen. Table lists the recommended cutting shielding gases and typical parameters for plasma cutting the aluminium alloys. Water injection into the nozzle can be used in addition to the orifice gas. This restricts the plasma jet further and produces a better quality more square cut although above 50 mm thickness these advantages are reduced. A development of the process known as high-tolerance plasma-arc cutting HT-PAC also known as plasma-constricted arc fine plasma or high-definition plasma has been developed and is being used as a cheaper alternative to laser cutting of material less than 12 mm in thickness. This variation to the plasma-arc process achieves a better quality cut with more perpendicular faces a narrower kerf and a less rough finish than the 56 The .