| 1.The core layer and ring core layer of the optical module are independently coupled with the input and output optical fibers; |
| 2.The power of the central and annular facula can be independently adjusted; |
| 3.The power of the middle core/ring core can be independently adjus ted, and the power swit ching time i s short (in milliseconds); |
| 4.The molten pool is larger and more stable, with a smaller temperature gradient; |
| 5.No spatter during welding, no pores inside the weld, and smoother and more aesthetically pleasing surface of the weld. |
