The aim of the research was to characterize the soldering alloy In-Ag-Ti type, and to study the direct soldering of SiC ceramics and copper. The In10Ag4Ti solder has a broad melting interval, which mainly depends on its silver content. The liquid point of the solder is 256.5 • C. The solder microstructure is composed of a matrix with solid solution (In), in which the phases of titanium (Ti 3 In 4) and silver (AgIn 2) are mainly segregated. The tensile strength of the solder is approximately 13 MPa. The strength of the solder increased with the addition of Ag and Ti. The solder bonds with SiC ceramics, owing to the interaction between active In metal and silicon infiltrated in the ceramics. XRD analysis has proven the interaction of titanium with ceramic material during the formation of the new minority phases of titanium silicide-SiTi and titanium carbide-C 5 Ti 8. In and Ag also affect bond formation with the copper substrate. Two new phases were also observed in the bond interphase-(CuAg) 6 In 5 and (AgCu)In 2. The average shear strength of a combined joint of SiC-Cu, fabricated with In10Ag4Ti solder, was 14.5 MPa. The In-Ag-Ti solder type studied possesses excellent solderability with several metallic and ceramic materials.
The contribution is dealing with the forging die renovation by hard facing and following machining processes. Deviation of weldment are creating during all types of welding technologies. Shape deviation determining is necessary to purpose of machining and welded layers control quality. The optical scanner ATOS II TripleScan was used to evaluate a quality and deformations of hard facing layers created by fusion welding. Obtained 3D model of the die was used not only for evaluation of quality but also to use as workpiece for CAM simulation of roughing process. The usage of obtained 3D model by ATOS II TripleScan indicate a significant improvement of machining time based on CAQ technology.
Abstract. This paper presents an analysis of weld joint deformation using optical 3D scanning. The weld joints of bimetals were made by explosion welding (EXW). GOM ATOS II TripleScan SO MV320 equipment with measuring volume 320 × 240 × 240 mm, 5.0 MPix camera resolution and GOM ATOS I 350 with a measuring volume of 250 × 200 × 200 mm, 0.8 MPix camera resolution were used for experimental deformation measurements of weldments. The scanned samples were compared with reference specimens. The angular and transverse deformation were visualized by colour deviation maps. The maximum observed deformations of the weld joints ranged from −1.96 to +1.20 mm.
The paper deals with the analysis of mechanical properties of welded joints made of AW 2099 aluminium-lithium alloy by electron beam welding. The thickness of the experimental material was 3±0.2 mm. PZ EZ 30 STU electron beam welding machine was used for production of welds. Maximum accelerating voltage used within this study was 55 kV. Metallographic analysis, hardness measurement test and static tensile were carried out. The structure of the weld joint of aluminium-lithium alloy was investigated. Produced welded joints were characterized by the presence of following zones: heat affected zone (HAZ), equiaxed non-dendritic zone (EQZ), columnar dendritic zone (CDZ) and equiaxed dendritic zone (EDZ). EQZ grains were formed due to heterogeneous nucleation on precipitates at the fusion boundary. EQZ is typical for joining of aluminium lithium alloys.
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