7.4 Mechanism and Influencing Factors of Stability of Dual-Beam Welding
199
Fig. 7.18 Curve of the
maximum keyhole amplitude
varying with the welding
speed
Welding speed v /(m·min
-1 )
Max amplitude
s/mm
Fig. 7.19 Statistics of
number of keyhole deep
oscillations with the
amplitude larger than
0.20 mm within 30–35 ms
Laser-spot spacing d/mm
Number
n
welding speed. It can be observed that, in simulated welding, with the increase of
the welding speed, the number of keyhole oscillations with the amplitude larger than
0.15 mm and the maximum amplitude decrease; in particular, when the welding
speed reaches 4.0 m/min, the maximum amplitude of the keyhole decreases greatly
to only 0.15 mm. It can be inferred that the keyhole may be in a stable state when the
welding speed is increased to a certain value. It can be seen that in the parallel dual
beam welding process, increasing the welding speed appropriately can improve the
stability of the keyhole.
7.4.2.6 Influence of Laser-Spot Spacing on Characteristics of Keyhole
Depth Oscillation
Figure 7.19 is a statistical graph showing the number of keyhole oscillations with