Manual Kemppi A7 TIG Orbital System 300 (page 20 of 61) (English)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

3.1.6 Fill passes, oscillation (weave), and stringer

bead techniques

The choice of a torch oscillation (weave) or stringer bead

technique is aected by a number of factors, as both

techniques have positive and negative features.

Oscillation

• High deposition rate, faster weld-out time

• Lower number of passes generally

• Higher heat input

• High alertness of welder required to monitor

torch centering

• Filler wire positioning more critical to ensure that

wire is not "dragging"

• Weld parameters require changing for each ll

pass to increase oscillation stroke and maintain

constant oscillation speed (requires multipass

programming).

The maximum normal oscillation width is 9.5 mm bead

width.

• You can use greater oscillation stroke widths,

but oscillation speed and travel speed must be

substantially reduced.

• Keep dwell times as short as possible because

they also aect bead overlap.

When welding on the horizontal pipe (5G position),

oscillation speed should equal the dwell times. This will

keep the bead at and the next pass will be easier to put

in.

• If the weld bead is convex, the AGC will have to

constantly correct arc length and the wire entry

becomes critical (entry angle should be 15 to 30°).

• The atter the entry angle, the more the wire will

drag on the weld surface. If the entry angle is too

steep, the wire pushes into the weld puddle.

When oscillating, you only want the spread to weld pool

into the sidewalls without undercutting or "climbing" the

walls.

• If the torch climbs the sidewalls, reduce the

oscillation width.

• If the puddle is wetting into the sidewalls, but

undercutting one wall, check that the torch is

perpendicular.

• If undercutting is occurring on both walls,

increase the at on the tungsten electrode.

When using continuous current (one current value) in the

oscillation mode during a 360° orbit, you may need to

reduce weld current on the uphill side due to heat buildup.

• When the current is too high, the downhill side is

concave and the uphill convex.

• Control the current to obtain a uniform at bead

or use the pulsillation technique.

• Adjust the dwell times to obtain uniformity in

weld bead.

In the pulsillation mode, the molten weld puddle should

solidify 3 mm (1/8") behind the electrode as it moves from

dwell point to another.

Stringer Bead

• Lower deposition rate, inferior weld-out time

• Higher number of passes generally

• Lower input desirable for heat input sensitive

materials

• Better weld puddle control with alloys having

poor puddle uidity (wetting)

• Lower level of welder attentiveness to monitor

torch centering

• Filler wire positioning less critical

• Easier for inexperienced personnel

• Identical parameters on all ll passes possible.

Stringer beads are typically run at higher wire speeds.

Typical wire speeds are 200 to 250 cm/min. Run stringer

beads using continuous travel mode and continuous wire

speed.

• When running stringer beads while wire is in

the 13 to 25 cm/min range, do not use the Wire

Step function unless background (two-level) wire

speed is available.

• If the weld bead is at on the downhill side and

convex on the uphill side, you may use the Wire

Step in conjunction with the Travel Step function

to atten the uphill side (wire speed 76–102 cm/

min).

The Travel Step and Wire Step function are commonly

used for single-pass square butt joints. Travel step can

also be used with consumable inserts to control ID bead

reinforcement in the horizontal pipes (5G position).

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Kemppi A7 TIG Orbital System 300 Manual

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