罗克韦尔变频22B-B2P3N104

22B-B2P3N104

22B-B2P3N104

影响材料对激光光束的吸收率的因素包括两个方面：首先是材料的电阻系数，经过对材料抛光表面的吸收率测量发现，材料吸收率与电阻系数的平方根成正比，而电阻系数又随温度而变化；其次，材料的表面状态（或者光洁度）对光束吸收率有较重要影响，从而对焊接效果产生明显作用。

CO2激光器的输出波长通常为10.6μm，陶瓷、玻璃、橡胶、塑料等非金属对它的吸收率在室温就很高，而金属材料在室温时对它的吸收很差，直到材料一旦熔化乃至气化，它的吸收才急剧增加。采用表面涂层或表面生成氧化膜的方法，提高材料对光束的吸收很有效。

4）焊接速度。焊接速度对熔深影响较大，提高速度会使熔深变浅，但速度过低又会导致材料过度熔化、工件焊穿。所以，对激光功率和厚度的某特定材料有一个合适的焊接速度范围，并在其中相应速度值时可获得大熔深。图10-2给出了1018钢焊接速度与熔深的关系。

5）保护气体。激光焊接过程常使用惰性气体来保护熔池，当某些材料焊接可不计较表面氧化时则也可不考虑保护，但对大多数应用场合则常使用氦、氩、氮等气体作保护，使工件在焊接过程中免受氧化。

氦气不易电离（电离能量较高），可让激光顺利通过，光束能量不受阻碍地直达工件表面。这是激光焊接时使用有效的保护气体，但价格比较贵。

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