A coupling equipment for YAG la-sers has been designed. By incoherent combing technology, three laser beams is combined to a higher power laser source delivered by a ifber output. The performance loss of power, beam quality and welding properties of the coupling device had been analyzed. The results show that the coupling device energy loss is less than 10% . The coupling laser beam energy distribution is symmetrical. Comparing with the single beam laser source, not only the output power of the laser is greatly increased, but also the thickness of metal welded by laser and the welding efifciency are increased.%研制了一套YAG激光耦合装置，利用非相干合成技术将三束激光合成为一束大功率激光，再通过耦合技术经由一根光纤输出。从功率损耗、光束质量及焊接性能三个方面对耦合装置的性能进行分析。结果表明，耦合装置能量损失小于10%；耦合后光束能量分布均匀；与单束激光源相比，激光器的输出功率得到大幅度增加，激光焊接厚度得到增大，焊接效率得到提高。
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