Daihen MWP-18 Instruction Manual - Page 10

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Standard Incorporated Parts

Make sure that the following are incorporated when unpacked.

Name

Collet (3.2)

Insulator

Lea collet (3.2)

"O" ring (P.12)

Nozzle (No.8)

Ceriated

electrode

Note: The above are standard specifications. We have a wide selection of optional parts so that you can

do a wide range of welding by replacing the replaceable part with a respective option.

For more details, see PARTS LIST on pp.8.

Functions of the Main Parts

3.1 Tungsten Electrode

Ceriated tungsten electrode (2% cerium contained, φ 3.2 × 150mm) is incorporated for standard

specifications. See pp.8 for tungsten electrode with other diameter.

3.1.1

Selection of Electrode

Ceriated tungsten (2% cerium contained, gray mark), thoriated tungsten (2 % thorium contained, red

mark) and pure tungsten (white mark) are commonly used as tungsten electrode.

Welding method

(power source)

DC TIG welding

AC TIG welding

Note: The table above lists only typical electrode and workpiece materials.

3.1.2

Selection of Electrode Diameter

Apply welding current within the range specified in Table 4 according to electrode diameter

Table 4 Relationship between Electrode Diameter and Welding Current

Electrode

DC TIG welding (negative electrode)

diameter

mm φ

Ceriated

tungsten

1.0

1.6

5 – 150

2.4

20 – 250

3.2

50 – 400

Note: This table describes the standard ranges of welding current that differ according to electrode

diameter.

Table 2 Standard Incorporated Parts

Part No.

H21B17

H21B60

H561C05

3572-012

H21B44

tungsten

0870-032

Table 3 Selection of Electrode

Materials of electrode

Ceriated tungsten (2% cerium contained)

Thoriated tungsten (2% thorium contained)

Ceriated tungsten (2% cerium contained)

Pure tungsten

Thoriated tungsten (2% thorium contained)

Thoriated tungsten

–

1 – 80

5 – 150

20 – 250

50 – 400

Quantity

For gas lens

JISB2401P12

(Silicon rubber)

φ 3.2 × 150mm

Stainless steel, mild steel, brass,

high carbon steel, cast iron,

copper, titanium, silver

Aluminum, aluminum casting,

magnesium, magnesium casting

Welding current (A)

Ceriated

tungsten

–

40 – 130

70 – 220

110 – 290

– 3 –

Remarks

Materials of wokpiece

AC TIG welding

Thoriated

Pure tungsten

tungsten

10 – 60

20 – 100

40 – 130

50 – 160

70 – 220

100 – 210

110 – 290

20 – 80