Solder properties for soldering solid pseudo alloy plates of monoblock bit obtained through testing for percussive drilling

During a study of the properties of solder, used as a binding material between a solid pseudo alloy plate and the steel base head of a monoblock bit, the focus was put on determining the qualitative-quantitative solder composition, measuring solder thickness in the clearance between the solid pseudo alloy plate and steel base, and measuring the hardness of the solder itself. Those parameters have a predominant effect on the quality of bonds, as well as on the exploitation life of the monoblock bit during percussion drilling in mining.

Measurement of the above parameters was performed on heads of monoblock bits that had been used for drilling in the working conditions of the various physicomechanical and abbrasive environments of Yugoslav mines.