Tweco K4000 User Manual

Page 22

4-6

STICKOUT 7" MAX

TORCH

ELECTRODE

TORCH HEADS (+)

AIR 80PSI

TRAVEL

WORKPIECE (-)

COPPER PEEL BACK

3/4" to 2"

ALWAYS UNDER THE ELECTRODE

Figure 4-12

5. Hold the electrode as shown in Figure 4-12, so that a maximum of 7” (178 mm)

extends from the torch. This extension should be 3” (76.5 mm) for aluminum.

6. While the torch valve is open, adjust the air pressure at the torch to the normal pres-

sures range between 80 psi (551.6 kPa) and 100 psi (690 kPa); higher pressures

may be used, but they do not remove metal more efficiently.

7. Adjust the welding current (Constant Current) or voltage (Constant Voltage), depend-

ing on the type of power supply being used, to the suggested current range shown

for the carbon diameter being used. Refer to Table 4-1.

Table 4-1 - Suggested Current Ranges (AMP) for Commonly Used Electrode Types and Sizes

Electrode

Diameter

DC Electrode DCEP

AC Electrode

AC Electrode DCEN

in (mm)

min - max

1/8 (3.2)

60 - 90

N/A

5/32 (4.0)

90 - 150

3/16 (4.8)

200 - 250

150 - 180

1/4 (6.4)

300 - 400

200 - 250

5/16 (7.9)

350 - 450

N/A

3/8 (9.5)

450 - 600

350 - 450

300 - 400

1/2 (12.7)

800 - 1000

N/A

5/8 (15.9)

1000 - 1250

3/4 (19.1)

1250 - 1600

1 (25.4)

1600 - 2200

3/8 (9.5) FLAT

250 - 450

5/8 (9.5) FLAT

300 - 500

This manual is related to the following products:

K3000