3.11 Welding conditions of WB-P350L/P400L/P500L
3-41
3.11.3 How the spatter adjustment parameter (APCS cond.) is used
In short arc welding where short-circuits and arcs are repeated, most of the spatter is generated
when short-circuiting occurs and immediately before arc generation. A phenomenon referred to as
“necking” occurs in the wires immediately before arc generation of the latter category, as shown in
the figure below. By detecting this necking and sharply reducing the current at that instant, the
melted metal is not blown about by the arc force and the generation of spatter can be significantly
reduced. To achieve this, it is most essential to detect the necking. Unless the necking is detected
at the appropriate timing, it will lead to the generation of spatter.
Fig. 3.11.1 Principle behind reducing spatter by detecting necking
The sensitivity for detecting necking is set in advance for each welding method and wire diameter.
However, this sensitivity is affected by such factors as the welding environment (lengths and
routing of secondary cables) and the actual welding conditions (welding conditions such as the
posture, lap welding and fillet welding, and the protrusion length of the wire). For this reason, the
preset necking detection sensitivity is not necessarily optimal, and the generation of spatter may
not be reduced satisfactorily.
WB- P350L/P400L/P500L function for automatically adjusting the necking detection sensitivity in
the face function. It is called the automatic necking sensitivity adjustment function.
POINT
How to reduce the spatter and keep the condition
In order to reduce spatter, it is necessary for necking to be detected properly.
To this end, the arc voltage must be fed back accurately. If the voltage
cannot be obtained properly because the arc voltage feed back is affected by
noise, the necking will not be detected properly, and this will give rise to
spatter. Furthermore, the automatic necking sensitivity adjustment function
will not work properly either. If the welding is unstable and large amount of
spatter are generated, review the routing of the voltage detection cable in
accordance with the “working environment checklist” described in the
instruction manual for the welding power supply.
POINT
In the case where the automatic necking sensitivity adjustment is not
performed
In the case of corresponding to the welding conditions shown in Table 3.11.3,
automatic adjustment isn’t applied. The fixed adequate conditions in the
welding power supply are applied.
0A
Short
Arc
Arc
Neck
Short-circuit current
inclination period
Short-circuit current
fixation period
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