AB模块22B-B5P0F104，22B-B5P0F104

22B-B5P0F104

22B-B5P0F104

保护气体是通过喷嘴口以的压力射出到达工件表面的，喷嘴的流体力学形状和出口的直径大小十分重要。它以足够大以驱使喷出的保护气体覆盖焊接表面，但为了有效保护透镜，阻止金属蒸气污染或金属飞溅损伤透镜，喷口大小也要加以限制。流量也要加以控制，否则保护气的层流变成紊流，大气卷入熔池，终形成气孔。

为了提高保护效果，还可用附加的侧向吹气的方式，即通过一较小直径的喷管将保护气体以的角度直接射入深熔焊接的小孔。保护气体不仅抑制了工件表面的等离子体云，而且对孔内的等离子体及小孔的形成施加影响，熔深进一步增大，获得深宽比较为理想的焊缝。但是，此种方法要求控制气流量大小、方向，否则容易产生紊流而破坏熔池，导致焊接过程难以稳定。

6）透镜焦距。焊接时通常采用聚焦方式会聚激光，一般选用63~254mm（2.5”~10”）焦距的透镜。聚焦光斑大小与焦距成正比，焦距越短，光斑越小。但焦距长短也影响焦深，即焦深随着焦距同步增加，所以短焦距可提高功率密度，但因焦深小，保持透镜与工件的间距，且熔深也不大。由于受焊接过程中产生的飞溅物和激光模式的影响，实际焊接使用的短焦深多为焦距126mm（5”）。当接缝较大或需要通过加大光斑尺寸来增加焊缝时，可选择254mm（10”）焦距的透镜，在此情况下，为了达到深熔小孔效应，需要更高的激光输出功率（功率密度）。

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