There could be several possible reasons for this issue. Here are some common causes of fusion splicing failures and some troubleshooting steps you can try:

1.Fiber Preparation: Ensure that the fiber ends are properly prepared, stripped, and cleaned before fusion splicing. Any dirt, residue, or inadequate fiber preparation can affect the quality of the splice. Use lint-free wipes and isopropyl alcohol to clean the fiber ends.

2.Fiber Alignment: Check the alignment of the fibers. Improper alignment can lead to weak or failed fusion splices. Make sure the fibers are properly aligned in the fusion splicer's v-grooves or alignment mechanism.

3.Electrode Condition: Inspect the condition of the electrodes. Worn or dirty electrodes can cause poor fusion and inconsistent results. Clean or replace the electrodes if necessary.

4.Fusion Parameters: Review the fusion splicer's fusion parameters, such as arc power, arc duration, and fusion time. Ensure that the parameters are correctly set according to the fiber type and diameter being spliced. Consult the fusion splicer manual for recommended settings.

5.Fiber Type and Compatibility: Verify that the fusion splicer supports the fiber types you are working with. Different fusion splicers may have limitations on the types of fibers they can splice. Ensure that your splicer is compatible with the specific fibers you are using.

6.Arc Calibration: Perform an arc calibration or electrode realignment on the fusion splicer. This process ensures the optimal performance of the splicer by adjusting the electrode positions. Follow the manufacturer's instructions for the calibration procedure.

7.Environmental Factors: Consider the environmental conditions during fusion splicing. Environmental factors such as humidity, temperature, and dust particles can affect the fusion process. Maintain a clean and controlled environment for splicing.

If you have tried the above troubleshooting steps and are still experiencing fusion splicing failures, it may be necessary to consult the manufacturer's customer support or a professional technician for further assistance. They should be able to provide more specific guidance based on your fusion splicer model and the nature the problem.

SEIKOFIRE is a factory with over a decade of experience in the fiber communication industry, specialized on fusion splicers. We have a professional after-sales team to solve your welding problems. Quality assurance, welcome to consult to negotiate.