Key points about why a belt splice is the weakest part

Material alteration:

Cutting and joining the belt ends disrupts the original fiber structure, potentially weakening the splice area. 

Stress concentration:

When the belt is under load, the forces tend to concentrate at the splice joint, increasing the risk of failure. 

Improper splicing techniques:

Poor workmanship, incorrect heat application, or using inappropriate splicing methods can significantly reduce the splice strength.

Wear and tear:

Over time, even a properly spliced belt can experience increased wear at the splice due to flexing and movement.