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The strength of soldered joints on ceramic substrates
Jansa, Vojtěch ; Nicák, Michal (referee) ; Adámek, Martin (advisor)
This thesis deals with problematic of lead – free soldering and consequent testing of mechanical characteristics of solder joints. The theoretical part is focused on various types of lead – free solders, influence of protective atmosphere on the solders characteristics and mechanical testing of solder joints. Basic materials and thick - films making technology is mentioned. Practical part contains a design of topology that was used for mechanical strength testing of solder joints connecting SMD component and ceramic substrate. Properties of lead – free solder pastes was investigated on various concentrations of O2 and compared with lead soldering paste.
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Study of the effect shielding gas on the quality of weld and parameters of laser welding
Procházka, Libor ; Chudík, Ivan (referee) ; Mrňa, Libor (advisor)
The subject of this diploma thesis is the use of laser welding technology in protective atmospheres. Based on the literary research presented in the theoretical part of the thesis, two experiments were made. Welding of materials X5CrNi18-10 and X2CrNiMo17-13-2. Welded sheets were performed in three different protective atmospheres. Samples were made from the welded sheets for measuring tensile strength, hardness, macrostructure and microstructure. These samples were analyzed. The output of the analysis is the evaluation of the impact that the protective atmosphere have on the quality of the welded joint and optimal process parameters.
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Visual comparison of lead-free connections for different material combinations
Šula, Matěj ; Starý, Jiří (referee) ; Schnederle, Petr (advisor)
Bachelors thesis describes problems soldering process. It summarizes the knowledge from soldering process, lead-free alloys and solder joint visual testing. The paper compares the influence of protective nitrogen atmosphere to the visual properties of lead-free solders for different base materials. It focuses mainly on assessment of the quality of solder joints in accordance with global standards IPC-A-610.The work includes the recommendations of material combinations.
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Study of the effect shielding gas on the quality of weld and parameters of laser welding
Procházka, Libor ; Chudík, Ivan (referee) ; Mrňa, Libor (advisor)
The subject of this diploma thesis is the use of laser welding technology in protective atmospheres. Based on the literary research presented in the theoretical part of the thesis, two experiments were made. Welding of materials X5CrNi18-10 and X2CrNiMo17-13-2. Welded sheets were performed in three different protective atmospheres. Samples were made from the welded sheets for measuring tensile strength, hardness, macrostructure and microstructure. These samples were analyzed. The output of the analysis is the evaluation of the impact that the protective atmosphere have on the quality of the welded joint and optimal process parameters.
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The strength of soldered joints on ceramic substrates
Jansa, Vojtěch ; Nicák, Michal (referee) ; Adámek, Martin (advisor)
This thesis deals with problematic of lead – free soldering and consequent testing of mechanical characteristics of solder joints. The theoretical part is focused on various types of lead – free solders, influence of protective atmosphere on the solders characteristics and mechanical testing of solder joints. Basic materials and thick - films making technology is mentioned. Practical part contains a design of topology that was used for mechanical strength testing of solder joints connecting SMD component and ceramic substrate. Properties of lead – free solder pastes was investigated on various concentrations of O2 and compared with lead soldering paste.
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|
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Visual comparison of lead-free connections for different material combinations
Šula, Matěj ; Starý, Jiří (referee) ; Schnederle, Petr (advisor)
Bachelors thesis describes problems soldering process. It summarizes the knowledge from soldering process, lead-free alloys and solder joint visual testing. The paper compares the influence of protective nitrogen atmosphere to the visual properties of lead-free solders for different base materials. It focuses mainly on assessment of the quality of solder joints in accordance with global standards IPC-A-610.The work includes the recommendations of material combinations.
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