Tweco Thermal Arc TA 500 - Manual (Page 32)

Operation 3-6 Manual No 0-0470
Table 3-B Recommended Cutting Speeds
The following charts are intended as a guide in determining approximate conditions for making good quality
cuts in various thicknesses of material. Slower speeds may generally be obtained by reducing the current.
250 Amperes
The speeds below are typical for cutting at 250 amperes using the 8-6042 tip and the 8-6006 end piece.
GENERAL PURPOSE WATER SHIELD
Plasma gas: N2 at 60 psi (4.1 bar) (85 scfh) Plasma Gas: N2 at 60 psi (4.1 bar) (85 scfh)
Secondary gas: CO
2
at 60 psi (4.1 bar) (85 scfh) Secondary: Water - 12 gph
500 Amperes
The speeds below are typical for cutting at 500 amperes using the 8-6044 tip and the 8-6006 end piece.
GENERAL PURPOSE WATER SHIELD
Plasma gas: N2 at 60 psi (4.1 bar) (95 scfh) Plasma Gas: N2 at 60 psi (4.1 bar) (95 scfh)
Secondary gas: CO
2
at 60 psi (4.1 bar) (350 scfh) Secondary: Water - 12 gph
THICKNESS:
BEST MAX BEST MAX
Stainless Steel 150 (3.81) See Note B 90 (2.29) 125 (3.18)
Aluminum 180 (4.57) See Note B 110 (2.79) 140 (3.56)
Carbon Steel 75 (1.9) 125 (3.18) 55 (1.4) 75 (1.9)
THICKNESS:
BEST MAX BEST MAX
Stainless Steel 60 (1.52) 80 (2.03) 40 (1.02) 50 (1.27)
Aluminum 80 (2.03) 100 (2.54) 50 (1.27) 60 (1.52)
Carbon Steel 35 (0.89) 50 (1.27) 20 (0.51) 30 (0.76)
THICKNESS:
BEST MAX
Stainless Steel 25 (0.64) 30 (0.76)
Aluminum 35 (0.89) 45 (1.14)
Carbon Steel 15 (0.38) 25 (0.64)
INCHES/MINUTE (METERS/MINUTE)
1/2" (12.7 mm) 3/4" (19 mm)
INCHES/MINUTE (METERS/MINUTE)
1" (25.4 mm) 1-1/2" (38 mm)
INCHES/MINUTE (METERS/MINUTE)
2" (50.8 mm)
THICKNESS:
BEST MAX BEST MAX
Stainless Steel 140 (3.56) 250 (6.35) 85 (2.16) 125 (3.18)
Aluminum 135 (3.43) 250 (6.35) 100 (2.54) 135 (3.43)
Carbon Steel 100 (2.54) 200 (5.08) 60 (1.52) 80 (2.03)
INCHES/MINUTE (METERS/MINUTE)
1/4" (6 mm) 1/2" (12.7 mm)