22

Parts & Service: 020 8988 7400 / E-mail: Parts@clarkeinternational.com or Service@clarkeinternational.com

• The arc length generally varies between 3 and 6 mm depending on

the type of joint, type and thickness of material and so on.

• The torch is advanced in the direction of welding, without lateral

movement, maintaining the torch angle of 45o to the workpiece.

Guidelines for the TIG welding current needed and recommended electrode

sizes etc. for different gauges of material are shown in the chart below:

Metal

Welding

Current

(Amps)

Workpiece

Thickness

(mm)

Filler Rod

Dia (mm)

Welding

Electrode

Dia (mm)

Gas Flow

ltr/min

Mild

Steel

20-30

1

0-1

1.6

4-5

60-80

2

1.2-1.6

1.6

4-5

80-110

3

1.6-2.0

1.6/2.4

4-5

100-130

3.5

2.0-2.4

2.4

5-6

130-140

4

2.4

2.4

6-7

140-150

4.5

2.4

2.4

7-8

150-160

5

2.4

2.4

7-8

Stainless

Steel

15-35

1

0-1

1.6

4-5

60-80

2

1.2-1.6

2.4

4-5

80-115

3

1.6-2.0

1.6/2.4

4-5

100-130

3.5

2.0-2.4

2.4

5-6

130-140

4

2.4

2.4

6-7

140-150

4.5

2.4

2.4

7-8

150-160

5

2.4

2.4

7-8

Copper

80

2

2.0

1.6

5-6

125

3

2.4

2.4

5-6

135-150

4

2.4

2.4

6-7

150-160

4.5

2.4

2.4

7-8