Bedienungsanleitung Kemppi A7 TIG Orbital System 300 (Seite 29 von 61) (Englisch)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

3.3.6 300-head guide ring speed factors

1. Use torch rotation speeds of 6 to 9 cm/min for most

welding applications.

2. Select torch rotation speed as the rst parameter.

Carriage speed refers to the speed at which the

weld head moves around the guide ring.

The weld head rotates on the guide ring, not the pipe

surface, and the tungsten electrode is extended inward to

the pipe surface.

3. Actual tungsten electrode speed is slower than

carriage speed. Correct this dierence with the

guide ring factor that can you can calculate when

the guide ring and pipe are set, or you can take the

factor from the table below.

Correction factor = diameter ratio between tractor rotation

diameter and tungsten electrode tip rotation diameter.

The weld head rotates on the guide ring OD, not the

pipe OD. Although this error is small on large pipes, it can

become signicant with small diameters when modifying a

pre-established weld procedure to a new pipe size.

4. For heavy wall pipe welding, correct for the change

in diameter as the weld bevel is progressively lled

and the tungsten is retracted outward (closer to the

guide ring diameter).

This correction factor is 17 mm* + Groove depth for given

pass.

*This value is the radial height of the guide ring.

5. To determine actual tungsten electrode speed from

carriage speed:

Electrode Speed (E.S.) =

T.S. mm/min × Pipe OD mm

Pipe OD mm + 17 mm

• T.S. = Carriage speed (speed that the tractor

has to move for the desired tungsten speed)

• E.S. = Desired tungsten electrode speed

6. Rotation speed can be continuous, or you can

select Step mode. In Step mode, two levels of

rotation speed are synchronized with pulsed

current. Rotation speed during high current pulse is

set as a percentage (0–99 %) of low pulse rotation

speed.

The Travel Step is often used for root pass welding on

materials with poor thermal conductivity, as the torch

can be momentarily stopped during high pulse current,

increasing the arc force available to penetrate the bevel

"land". This feature is also useful when welding thin wall

material that can be welded in a single pass.

The guide ring factor is marked on the face of each

guide ring.

Table: Guide ring factors

Guide ring

size

Pipe/tube nom. OD Guide ring

factor

1 ¾” Tube 1.750“ (44.5 mm) 7.5

1 ½” Pipe 1.900” (48.3 mm) 8.0

2” Tube 2.000” (50.4 mm) 8.5

2 1/8” Tube 2.125” (54.0 mm) 9.0

2” Pipe 2.375” (60.3 mm) 9.5

2 ½” Tube 2.500” (63.5 mm) 10.0

2 ½” Pipe 2.875” (73.0 mm) 11.0

3” Tube 3.000” (76.2 mm) 11.5

3 ¼” Special 3.250” (82.6 mm) 12.5

3” Pipe 3.500” (88.9 mm) 13.0

3 ½” Pipe 4.000” (101.6 mm) 14.5

4” Pipe 4.500” (114.3 mm) 16.0

4 ½” Pipe 5.000” (127.0 mm) 18.0

5” Pipe 5.563” (141.3 mm) 19.5

6” Pipe 6.625” (168.3 mm) 23.0

7 5/8” Tube 7.625” (193.7 mm) 26.5

8” Pipe 8.625” (219.1 mm) 29.5

10” Pipe 10.750” (273.1 mm) 36.0

12” Pipe 12.750” (323.9 mm) 42.5

14” Pipe 14.000” (355.6 mm) 46.5

See calculation of guide ring factor.

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