Huggies Joint

Dear all

We regularly face the problems in huggies joint. Joints are open
after polish then again we have to burnish and it increases our
production time. In filing stage, we solder two parts of huggies with
pin joint In soldering this pin we use “COBB 414” gold ready made
solder for better effect. WE had tried hand made solder but this also
no use Is any one having solution for this?