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3.8 Welding conditions of WB-M350L/M400L
3-25
Concerning the burnback pulse control
Teaching of this parameter is available only when the wire material is SUS. This should be
normally set to “ON”.
Meanwhile, the burnback pulse output value should be normally set to “0”.
This shall be set to “OFF” only when a meltdown occurs on the thin plate during burnback.
3.8.3 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. The sensitivity with which necking
is detected can be adjusted using the APCS parameters.
Fig. 3.8.1 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-M350L has a function for automatically adjusting the necking detection sensitivity in the face
function. It is called the automatic necking sensitivity adjustment function.
Whether the necking is being detected properly can be determined by the “reduction rate” on the
arc monitor.
0A
Short
Arc
Arc
Neck
Short-circuit current
inclination period
Short-circuit current
fixation period
Summary of Contents for OTC Almega AX Series
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