采用激光焊接技术，对Zr基大块非晶合金(BAA)Zr45Cu48Al7(原子数分数(%))进行了焊接实验，研究在激光焊接下不同工艺参量对焊接接头组织的影响，初步探讨了在焊接热循环过程中焊缝和热影响区的晶化行为。结果表明，在激光输出功率1200 W，焊接速率8 m/min的条件下，成功地获得了无气孔和裂纹等缺陷的焊接接头。焊缝和热影响区均没有出现晶化现象，仍然保持非晶结构。而当激光输出功率不变，焊接速率分别为2 m/min，4 m/min的工艺条件下，焊接后的接头则出现了不同程度的晶化现象。利用光镜和微区X射线衍射(XRD)实验分析确定:2 m/min条件下焊缝和热影响区均出现了晶化现象，晶化相主要为ZrCu相和Zr38Cu36Al26相(τ5);4 m/min条件下焊缝未出现晶化现象而热影响区出现晶化，晶化相主要为ZrCu相和τ5相。

Laser welding technology was adopted to weld Zr-base bulk amorphous alloy (BAA) Zr45Cu48Al7 (at.-%) plate. The structure of joint under different technical parameters during laser welding was researched, and the crystallization behavior of the bead and heat-affected zone (HAZ) during the thermal cycle of welding was primarily discussed. The results showed that an excellent joint has been obtained and there was no visible defect, pore or crack in both the bead and HAZ when the output power of laser-beam was 1200 W and the scanning velocity was 8 m/min. No crystal was observed in both the bead and HAZ with keeping the amorphous structure. However, crystallization occurred in both the bead and HAZ under the condition of the same output power but the scanning velocity of 2, 4 m/min. From the optical microscope and the micro-focused X-ray diffraction (XRD) experiment, it made sure that there was crystal in both the bead and HAZ under the scanning velocity of 2 m/min and the crystalline phases were mainly ZrCu phase and Zr38Cu36Al26 phase (τ5). There was some crystal in HAZ while no crystal in the bead under the scanning velocity of 4 m/min, and the crystalline phases were almost the same as under 2 m/min scanning.