1. Common borders. Common solutions. EUROPEAN UNION GOVERNMENT OF ROMANIA SERBIAN GOVERNMENT Structural Funds 2007-2013 Romania – Republic of Serbia IPA Cross-border Cooperation Programme DEVELOPING DEEP BRAZED JOINTS BETWEEN SINTERED TUGSTEN CARBIDES AND THE LOW ALLOYED STELL SUPORT (2%Cr) PhD. Student Eng. BINCHICIU EMILIA PhD. Eng. BINCHICIU HORIA

2. Common borders. Common solutions. The presented results are from CONTRACT PCCA type 2 no. 188/2012 PERFORMANT MATERIALS AND TECHNOLOGIES DESIGNED FOR DEVELOPING CUTTER KNIFE FOR ASFHALT EQUIPMENT – MATFREZ, ongoing, the consortium being consisted of:  SC SUDOTIM AS SRL TIMISOARA  TRANSYLVANIA UNIVERSITY BRASOV  UPB – CEMS BUCHAREST  SC ECONET PROD SRL BUCHAREST  INTEC SA BUCHAREST www.matfrez.ro www.sudotim.ro MATFREZ

3. Common borders. Common solutions. The problem to be solved consists in achieving by brazing of the reinforcement of the cutter knife for asphalt layers from the road infrastructure. Brazed components. Table Name Rod Chemical Composition [% mass] Base Metal Chemical Composition [% mass] AgCuZnSnCMnSiCrWCCo VIAg40Sn40,133,226,02,7------ Suport----0,81,20,352,3-- Sinered reinforcement --------72,59,2 Determined chemical composition of the base and addition materials

4. Common borders. Common solutions. BRAZING TECHNIQUE Cross section of a silver alloy joint Macro graphic analysis in the joint section Full spread connection (good adhesion and wetting of the brazing alloy in the upper zone of the slot). Lack of spreading in the solder alloy capillary joint (the lower zone of the slot). Correct positioning of the tungsten carbide tip.

5. Common borders. Common solutions. The brazing materials type mechanical flux mixture FH 10 30%, according to EN 1045 with Ag 105 70%, according to EN 1044. Grinding the alloy AG105 was performed in the planetary mill. The mixture blending was done in the plow mixer. Planetary millPlow mixer

6. Common borders. Common solutions. The flame brazing solution by heating support and transferring heat throw radiation and conduction, by the molted base material toward the reinforcement, made of tungsten carbide, resulted in a adequate joint for industrial requirements. Micrographic analysis of the joint in cross section of the brazed knife.

7. Common borders. Common solutions. CONCLUSIONS Conducted research in order to accomplish brazed joints of the cutter knife support with the reinforcement showed: Using the direct oxyacetylene flame heating brazing procedure of the support and reinforcement, followed by the melting of brazing alloy, developed under the form of covered rod, resulted in joints with lack of addition material in the lower zone of the joint, witch imposed developing a new material, powder mechanical mixture FH10 – AG105. The solution of brazing by indirect heating of the support, equipped in the notch with brazing material, type powder mechanical mixture FH10 – AG105, resulted in achieving joints adequate to distribution and diffusion requirements of the brazing alloy on the brazing surface.

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