Bedienungsanleitung Kemppi A7 TIG Orbital System 300 (Seite 18 von 61) (Englisch)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

3. OPERATION

3.1 Welding settings

3.1.1 Setting current level

Choose weld current after selecting RPM (tungsten speed).

Use the following guidelines:

Carbon

steel

1.3 amps per .025 mm of material to

penetrate.

Stainless

steel

1.0 amps per .025 mm of material to

penetrate.

High alloy

steel

0.75 amps per .025 mm of material to

penetrate.

Above guidelines do not take into consideration ller

wire addition, bevel geometry, or tungsten geometry. They

are based on an electrode moving across a at surface

(typically at a speed of 76 mm/min). When making a 360°

horizontal pipe weld (5G), some current programming

may be needed to counteract the eect of heat buildup. In

some cases, a given start position is mandatory to prevent

concavity at 6 o'clock position.

To avoid current programming or to minimize

programming requirements, use pulsed current technique.

Pulsed current allows the weld puddle to chill and partially

solidify between pulses and provides better control of the

weld puddle. When pulsing, a minimum of 50 % overlap

of the ID bead must be maintained for proper ID bead

reinforcement. Pulse frequency is typically 1 to 10 Hz. A

frequency of 1 Hz is typical for tungsten electrode speeds

of 63 to 90 mm/min.

Increasing tungsten electrode speed above 90 mm/min

requires an increase in pulse frequency to maintain an

appropriate 50 % overlap of ID bead (the solidied bead

from the previous pulse). To obtain high and low pulse

current, use the following formula:

• Average current + (average current/3)

= high-pulse current

• Average current - (average current/3)

= low-pulse current

As a starting point, keep the high and low pulse times

equal (0.3 seconds on, 0.3 seconds o).

Low pulse current is always programmed as a percentage of

high pulse (rather than an actual value). If the weld current

is reduced to compensate for heat buildup in the pipe,

both high and low pulse levels go down proportionally.

• High pulse current programmed on remote

control is actual amperage value.

• Low pulse current programmed on remote

control is a percentage of high pulse current.

3.1.2 Pulsillation (synchronized pulsed current/

oscillation mode)

Pulsed current is automatically synchronized with torch

oscillation whenever the two functions are switched on

simultaneously. This "pulsillation" capability is useful in

certain situations:

• The 2nd or "Hot Pass" can pose special diculties.

• A current level too high will cause re-penetration

of the root pass.

• A level too low will result in lack of sidewall

fusion.

When using the pulsillation mode, the high and low pulse

periods are controlled by the torch oscillator system. High

pulse current occurs during both oscillation stroke end

point "dwell" periods. Low pulse current occurs as the torch

moves laterally across the weld joint. The high and low

pulse controls are not functional when the synchronized

pulsed current/oscillation mode is selected.

3.1.3 Filler wire speed

Filler wire speeds for the root pass are determined by prep

geometry. Typical values for a square butt or a "J" Prep are

25 to 76 cm/min. As the land thickness increases, wire

speed should decrease. Fill-pass wire speeds range from

76 to 190 cm/min. For 360° orbital welding, the higher the

wire speed, the you need to use pulsillation to control the

weld puddle size.

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