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Surface melting and possible alloying of cast iron with lamellar graphite by electron beam
Abu Khait, Yosef ; Kouřil, Miloslav (referee) ; Pacal, Bohumil (advisor)
In this thesis, the structural and mechanical changes, which took place in flake graphite cast iron after electron beam surface melting and chrome-nickel surface alloying, were studied. Furthermore, the effect of set parameters on properties and depth of the melted and alloyed region is also analyzed. In the experimental part, the analyzed microstructures, micro-hardness and the distribution of elements after melting and alloying, were presented. Structural differences of material regions caused by melting were described based on microstructures. In the end of diploma thesis, the conclusions of using EB technology for surface melting and alloying were discussed.
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Comparison of GTAW and Plasma Welding
Hotárek, Jan ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
The work presents a comparison of two welding methods: plasma welding and GTA W. The principle of both welding methods was described in the theoretical part of this work. For the experimental part a base material was chosen - chrome-nickel steel labeled X5CrNi 18-10 and added material in the form of rod OK TIGROD 16.95. Three samples were made for each welding method. Samples were assessed according to applied specific heat which didn't vary in case of the samples made by plasma welding but was different for each sample made by GTA W. Further, the samples were assessed according to a development of hardness: in case of plasma welding the values at the edge of the weld were significantly higher than at the root of the weld but in case of GTA W the values at the edge and at the root of the weld were almost the same. The area affected by heat was not adequately distinctive with any of the samples. The check of the final structure of the welded material was performed with the help of the Shaeffler diagram. For plasma welding method, for which added material in the form of rod was used, dilution of the welding metal was determined.
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Surface melting and possible alloying of cast iron with lamellar graphite by electron beam
Abu Khait, Yosef ; Kouřil, Miloslav (referee) ; Pacal, Bohumil (advisor)
In this thesis, the structural and mechanical changes, which took place in flake graphite cast iron after electron beam surface melting and chrome-nickel surface alloying, were studied. Furthermore, the effect of set parameters on properties and depth of the melted and alloyed region is also analyzed. In the experimental part, the analyzed microstructures, micro-hardness and the distribution of elements after melting and alloying, were presented. Structural differences of material regions caused by melting were described based on microstructures. In the end of diploma thesis, the conclusions of using EB technology for surface melting and alloying were discussed.
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Comparison of GTAW and Plasma Welding
Hotárek, Jan ; Kubíček, Jaroslav (referee) ; Daněk, Ladislav (advisor)
The work presents a comparison of two welding methods: plasma welding and GTA W. The principle of both welding methods was described in the theoretical part of this work. For the experimental part a base material was chosen - chrome-nickel steel labeled X5CrNi 18-10 and added material in the form of rod OK TIGROD 16.95. Three samples were made for each welding method. Samples were assessed according to applied specific heat which didn't vary in case of the samples made by plasma welding but was different for each sample made by GTA W. Further, the samples were assessed according to a development of hardness: in case of plasma welding the values at the edge of the weld were significantly higher than at the root of the weld but in case of GTA W the values at the edge and at the root of the weld were almost the same. The area affected by heat was not adequately distinctive with any of the samples. The check of the final structure of the welded material was performed with the help of the Shaeffler diagram. For plasma welding method, for which added material in the form of rod was used, dilution of the welding metal was determined.
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