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首页> 外文会议>Conference on Laser Materials Processing Vol.85f: Welding and Modeling, Nov 16-19, 1998, Orlando, FL USA >Suppression of Cracks by Means of Added Ultrasonic Vibration and/or Controlled Pulse-Train in Laser Spot Welding of Aluminum Alloys
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Suppression of Cracks by Means of Added Ultrasonic Vibration and/or Controlled Pulse-Train in Laser Spot Welding of Aluminum Alloys

机译：铝合金激光点焊中通过附加的超声波振动和/或受控的脉冲培训来抑制裂纹

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摘要

When aluminum alloys are joined by laser spot welding, many cracks are formed easily in the melt part because of their high thermal diffusivity. The cracks were formed along boundaries of equiaxed crystal grains and segregation was estimated at the boundaries. The crack was evaluated by a crack ratio which was defined as a rate of crack area against melt one. In order to reduce the cracks at the weld parts, ultrasonic vibration was added to melt part during laser irradiation, and newly developed Nd:YAG laser apparatus with pulse-train of laser beams was used and many kinds of pulse-trains were tried. Used aluminum alloys were A5052(Mg: 2.2-2.8wt%) and A5182(Mg: 4.5-5.0wt%). First of all, lapped spot welding of aluminum alloys and stainless steel(AISI 304, 40um in thickness) was carried out, and stirring rate of the melt pool was evaluated by EPMA. As a result, both metals were mixed more in the case of ULW( Ultrasonic vibration Laser Welding) than in the case of BLW(Basic Laser Welding). Then, microstructure of fusion zones was observed with an optical microscope. There were many equiaxed crystal grains in BLW. But, such a grain was not observed in ULW. Change of Vickers' hardness distribution in a fusion zone was smaller in ULW than in BLW, and also the crack ratio was smaller in ULW than in BLW. New laser apparatus was applied to form a sound weld part in both cases of independent use of controlled pulse-train:PTLW(Pulse-Train Laser Welding) and combined use of pulse-train with ultrasonic vibration:CLW(Combined Laser Welding). Crack ratios were 2.8% in BLW, 2.5% in ULW, 2.0% in PTLW and 1.6% in CLW.
机译：当铝合金通过激光点焊连接时，由于其高的热扩散率，容易在熔体部分形成许多裂纹。裂纹沿着等轴晶粒的边界形成，并且估计边界处的偏析。通过裂纹率评估裂纹，裂纹率定义为裂纹面积对熔体的比率。为了减少焊接部位的裂纹，在激光照射过程中，在熔融部位增加了超声波振动，使用了新开发的具有激光的脉冲列的Nd：YAG激光装置，尝试了多种脉冲列。使用的铝合金是A5052（镁：2.2-2.8wt％）和A5182（镁：4.5-5.0wt％）。首先，进行铝合金和不锈钢（AISI 304，厚度为40um）的搭接点焊，并通过EPMA评估熔池的搅拌速率。结果，在ULW（超声波振动激光焊接）的情况下比在BLW（基本激光焊接）的情况下两种金属的混合更多。然后，用光学显微镜观察融合区的微观结构。 BLW中有许多等轴晶粒。但是，在ULW中未观察到这种晶粒。在ULW中，维氏硬度分布的变化在ULW中比在BLW中小，并且裂纹率在ULW中比在BLW中小。在独立使用可控脉冲序列：PTLW（脉冲火车激光焊接）和将脉冲序列与超声振动：CLW（组合激光焊接）结合使用的情况下，都使用了新的激光设备来形成健全的焊接零件。 BLW的裂纹率为2.8％，ULW的裂纹率为2.5％，PTLW的裂纹率为2.0％，CLW的裂纹率为1.6％。

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