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Stefano Saccarola
1. DEVELOPMENT OF IRON BASE POWDERS SUITABLE FOR LASER WELDING S. Libardi*, S. Saccarola** , C. Poli***, C. Menapace*, A. Molinari* * University of Trento ** Pometon S.p.A. Venice - Italy. *** Pentax srl Marostica (VI), Italy
4. Stone cutting: the evolution In 1953 first synthesis of an artificial diamond
5. Diamond tools used for cutting of stones and other hard construction materials
6. Laser welding Laser welding needs a diamond free mixture Common backing material composition is Co , Ni , Fe based powder Backing material Complex (metallic matrix with diamonds)
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10. Experimental procedure: Two powders used: Fe-Ni (Ni 10%) Extrafine Co Mixed and ball milled for 20 h then we test three powder mixtures: - simply mixed powder - milled powder - 50-50 mixture of them
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12. Densification Densification curves of the mixed and milled powders after hot pressing at 900°C 516 ±7 HV0.05 7.96 Milled 213 ±28 HV0.05 8.07 Mixed Microhardness Density (g/cm 3 ) Powder
15. Mixing 50 – 50 of them.. Density of the different materials versus the hot pressing temperature
16. Hot pressing at 800°C mixed milled “ mixed+milled” microhardness
17. Mechanical properties (1) three points bending curves of specimens obtained with the mixed powder tensile curves of specimens obtained with the mixed powder
18. Mechanical properties (2) three points bending curves of specimens obtained with the milled powder tensile curves of specimens obtained with the milled powder
19. Mechanical properties (3) three points bending curves of specimens obtained with the mixture of the two powders tensile curves of specimens obtained with the mixture of the two powders