hello sir wanted to know what is the life of a hor

hello sir,
            i am into non standard bearing manufacturing,to get the cost of the bearing down i have designed a plastic retainer which hold the balls at equidistant also i have desined a capping for it so that the grease filled in is retained without any dust moving in the groove .i did the suceessful welding of it (derlin).but the machines manufacturers say that the cost of horn designed for me is to be beared by me i am ready for it but they say they cannot exactly tell me for how many welding times will this horn be intact which is making it difficult for me to deceide the costing of final product.i would love to show u the picture of the component if possible. bearing dimenision is weld area is just ( 12.5 - 7.5 )that is a thin rim u can say of just about 2mm in width

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