Changes in Laser Weld Bead Geometry with the Application of Ultrasonic Vibrations
Changes in Laser Weld Bead Geometry with the Application of Ultrasonic Vibrations
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应用超声波振动改变激光焊缝几何形状
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通讯作者：
J. Mazumder
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作者：
S. Venkannah;J. Mazumder
熔焊过程中的参数设置功能，如焊接速度和焊接功率。应用于传统铸造和焊接工艺的振动（声波和超声波）改变了许多金属和合金的机械性能，通常会降低功率要求，加工温度和时间。振动还影响熔池动态，从而沿着所得到的固化焊道的表面拓扑的变化。研究人员已经将生长速率、冷却速率、热梯度和凝固速率与在超声辅助焊接期间受到振动干扰的焊缝几何形状相关联。低碳钢板在不同速度下进行“板上焊道“激光焊接时受到低声功率超声的作用。低碳钢板的一端由超声波变幅杆保持，超声波通过该变幅杆注入。然后使用CO2激光器（1 kW）沿板的中心沿着进行长度为80 mm的板上焊道焊接。经过几次试验测试后，使用了以下两种焊接速度：400和2000 mm/min。对于每个焊接速度，选择的超声波功率分别为3 W和6 W，因为较高的声功率导致焊接期间熔融金属从熔池喷射。焊缝的表面形貌已经受到超声波的影响，并且该效果明显地取决于焊接速度和声功率。焊接速度影响熔池的尺寸，而声功率影响熔池上的强迫振动的大小。在某些情况下，熔池中的不同层相互挤压，并被迫在凝固的焊道上向后移动。
function of the parameter settings, such as welding speed and welding power, during fusion welding. Vibrations (both sonic and ultrasonic) applied to conventional casting and welding processes have changed the mechanical properties of many metals and alloys usually with a decrease in power requirements, processing temperature and time. Vibrations also affect the pool dynamics bringing along a change in the surface topology of the resultant solidified weld bead. Researchers have related the growth rate, cooling rate, thermal gradient and solidification rate to the weld bead geometry which is being disturbed by vibrations during ultrasound assisted welding. Mild steel plates were subjected to ultrasound of low acoustical power during " bead on plate " laser welding at different speeds. The mild steel plate was held at one end by the ultrasonic horn through which ultrasound was injected. A bead on plate weld of length 80 mm was then performed along the center of the plate using a CO 2 laser (1 kW). After several trial tests, the following two welding speeds; 400 and 2000 mm per minute were used. The ultrasonic powers selected were 3W and 6W respectively for each welding speed as higher acoustical power was causing ejection of molten metal from the pool during welding. The surface topography of the weld beads have been affected by ultrasound and the effect is clearly dependent on both the welding speed and acoustical power. The welding speed affects the size of the molten pool while the acoustical power influences the magnitude of the forced vibration on the pool. The different layers in the molten pool are being pressed against each other and forced to move backwards on eth solidified weld bead in some cases.