活性剂对TC4薄板背反射增效激光焊接成形的影响

Effect of surfactant on TC4 sheet with back reflection induced synergistic laser welding

关键词:  钛合金薄板|激光焊接|背反射羽辉效应|活性剂|焊缝形貌

Key words:  titanium alloy sheet|laser welding|back reflection plume effect|surfactant|welding appearance

摘要:

为探索降低钛合金薄板激光X形焊接成形所需能量阈值的途径，较为系统地分析了活性剂的种类、涂覆厚度和涂覆位置对钛合金薄板背反射增效激光焊接成形的影响. 结果表明，不同种类的活性剂的影响不同，其中涂覆NaCl和NaF有利于背反射羽辉效应的形成，而涂覆TiO₂时则对其有一定的弱化. 同时，随着活性剂涂覆厚度的增大背反射羽辉效应进一步增强，且NaF相对于NaCl而言对涂覆厚度更加敏感. 此外，在施焊背面涂覆活性剂几乎没有影响. 分析认为，活性剂对钛合金薄板背反射增效激光焊接成形的影响，主要归因于其对激光能量吸收的增益.

Abstract:

In order to explore the way to reduce energy threshold in X-shape welding formation of TC4 sheet, the influence of surfactant type, coating thickness and coating position on back reflection induced synergistic laser welding was systematically analyzed in this paper. The results show that the effect of different kinds of surfactant were different. Among them, coating NaCl and NaF is conducive to the formation of back reflection plume effects, while coating TiO₂ has some weak effect. At the same time, the back reflection plume effect was further enhanced the increase of the surfactant coating thickness NaF was more sensitive to the coating thickness than NaCl. In addition, there is little effect when coating surfactant on the back of weld. It is concluded that the effect of surfactant on the back reflection induced synergistic laser welding of TC4 sheet is mainly due to the gain of laser energy absorption.