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首页> 外文期刊>Optics & Laser Technology >Double-sided fiber laser beam welding process of T-joints for aluminum aircraft fuselage panels: Filler wire melting behavior, process stability, and their effects on porosity defects
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Double-sided fiber laser beam welding process of T-joints for aluminum aircraft fuselage panels: Filler wire melting behavior, process stability, and their effects on porosity defects

机译：铝制飞机机身面板T型接头的双面光纤激光束焊接工艺：填充丝熔化行为，工艺稳定性及其对孔隙缺陷的影响

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摘要

Aluminum alloy T-joints for aircraft fuselage panels were fabricated by double-sided fiber laser beam welding with filler wire, and the influence of the wire feeding posture on the welding process stability was investigated. A CMOS high speed video system was used to observe the wire melting behavior and the weld pool dynamics in real time during the welding process by using a bandpass red laser with an emission wavelength of 808 nm as backlight source to illuminate the welding zone. The weld porosity defects were analyzed by X-ray radiography. The effects of wire feeding posture on the wire melting behavior, process stability, and porosity defects were investigated. The experimental results indicated that three distinct filler material transfer modes were identified under different wire feeding positions: liquid bridge transfer mode, droplet transfer mode, and spreading transfer mode. The liquid bridge transfer mode could guarantee a stable welding process, and result in the lowest porosity. Compared with wire feeding in the leading direction, the process was not stable and porosity increased when wire feeding in the trailing direction. Increased in the wire feeding angle was disadvantage for pores to escape from the weld molten pool, meanwhile, it made the welding process window smaller due to increasing the centering precision requirement for adjusting the filler wire.
机译：通过用填充丝进行双面光纤激光束焊接，制备了飞机机身面板铝合金T型接头，研究了送丝姿势对焊接工艺稳定性的影响。 CMOS高速视频系统通过使用发射波长为808 nm的带通红激光作为背光源来照亮焊接区域，从而在焊接过程中实时观察焊丝熔化行为和焊池动态。通过X射线照相术分析焊缝孔隙缺陷。研究了送丝姿势对焊丝熔化行为，工艺稳定性和孔隙率缺陷的影响。实验结果表明，在不同的送丝位置下，确定了三种不同的填料转移方式：液桥转移方式，液滴转移方式和铺展转移方式。液桥传递模式可以确保稳定的焊接过程，并导致最低的孔隙率。与沿引线方向进给相比，沿引线方向进给时工艺不稳定，且孔隙率增加。送丝角度的增加不利于孔从焊接熔池中逸出，同时，由于增加了对填充焊丝的定心精度的要求，使得焊接工艺窗口更小。

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