Oscillation characteristics of molten pool in ultra-thin plate pulsed micro-plasma arc welding
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摘要: 由于熔池的振荡行为，熔池轮廓的动态变化具有一定的波动性. 基于视觉传感检测方法，研究0.1 mm厚超薄板不锈钢脉冲微束等离子弧焊接的熔池振荡行为，讨论焊接电流的不同脉冲参数对熔池振荡频率和振幅的影响. 结果表明，在基值电流和峰值电流作用期间，熔池的大小是小幅度波动的，这是由熔池振荡引起的；熔池的振荡频率在一定范围内随着脉冲电流的频率增加而增加，而熔池振荡幅度随脉冲电流频率的加大而减小. 熔池的振荡频率可以反映焊缝成形质量的好坏.Abstract: Due to the oscillation behavior of the molten pool, the dynamic change of the molten pool profile has a certain fluctuation. Based on the visual sensing detection method, the oscillation behavior of molten pool in pulsed micro-plasma arc welding of 0.1 mm thick ultra-thin stainless steel was studied, and the influence of different pulse parameters of welding current on the oscillation frequency and amplitude of molten pool was discussed. The results show that the size of molten pool fluctuates slightly during the action of base current and peak current, which is caused by molten pool oscillation. The oscillation frequency of the molten pool increases with the increase of the pulse current frequency in a certain range, while the oscillation amplitude of the molten pool decreases with the increase of the pulse current frequency. The oscillation frequency of the molten pool can reflect the quality of the weld seam forming.
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图 1 超薄板P−MPAW熔池视觉传感检测系统
Figure 1. Vision sensing detection system for P−MPAW molten pool of ultra-thin plate
图 4 焊接过程中熔池宽度、长度、面积和宽长比随时间的动态变化
Figure 4. Dynamic changes of molten pool width, length, area and width-to-length ratio with time during welding
图 5 基于熔池宽度波动的熔池振荡幅度与频率受占空比的影响
Figure 5. Oscillation amplitude and frequency of molten pool based on fluctuation of molten pool width affected by duty cycle
图 6 基于熔池长度波动的熔池振荡幅度与频率受占空比的影响
Figure 6. Oscillation amplitude and frequency of molten pool based on fluctuation of molten pool length affected by duty cycle
图 7 基于熔池宽度和熔池长度的熔池振荡幅度与频率受脉冲频率的影响
Figure 7. Oscillation amplitude and frequency of molten pool based on width and length of molten pool affected by pulse frequency
图 8 不同脉冲频率下超薄板P−MPAW的焊缝成形
Figure 8. Weld seam formation of ultra-thin plate P−MPAW with different pulse frequencies
表 1 焊接工艺参数
Table 1. Welding process parameters
焊接速度/
（mm∙s−1）焊接电流/
A离子气流量/
（L∙min−1）保护气流量/
（L∙min−1）焊炬高度/
mm4.2 1.8 0.5 3.5 2 
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表 2 脉冲参数
Table 2. Pulse parameters
占空比△/% 基值电流Ib /A 峰值电流Ip /A 脉冲频率f /Hz 30
30
30
50
50
50
70
70
700.80
1.20
1.50
0.80
1.20
1.50
0.80
1.20
1.504.12
3.20
2.50
2.80
2.40
2.10
2.22
2.06
1.921
5
25
1
5
25
1
5
25
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