Določitev primerne metode za preverjanje kakovosti zvarnih spojev pri laserskem varjenju električnih kontaktov

Čotar, Robi (author), Klobčar, Damjan (mentor)

Zaključna naloga obravnava določevanje najprimernejše metode za preverjanje kakovosti zvarnih spojev električnih kontaktov iz bakrove zlitine CuCrSiTi. Medsebojno jih spajamo s postopkom laserskega varjenja. Pogoj pri določanju preizkuševalne metode je enostavnost, izvedljivost v čimkrajšem času, poleg tega pa mora dajati zanesljive rezultate. V eksperimentalnem delu smo opravili preizkuse kakovosti zvarnih spojev z različnimi metodami, primernimi za uporabo v proizvodnem procesu. Preverjanje kakovosti smo najprej izvedli z vizualno kamero takoj po operaciji varjenja. Sledil je natančnejši vizualni pregled z digitalnim mikroskopom in programsko opremo na osebnem računalniku. Na vizualno preverjenih vzorcih smo nato z izvlečnim preizkusom merili izvlečno silo, ki je potrebna za porušitev zvarnega spoja. Nazadnje pa smo na podlagi metalografskih prerezov merili potek mikrotrdote vzdolž zavarjenih kontaktov. Ugotovili smo, da z uporabo digitalnega mikroskopa za vizualno kontrolo povečamo zanesljivost preverjanja kakovosti v primerjavi z uporabo vizualne kamere, kar so potrdile meritve mikrotrdote. Izvlečni preizkus pa se je za preizkušanje kakovosti izkazal kot neprimeren, saj vizualna ustreznost zvarnih spojev ne vpliva na velikost izmerjene izvlečne sile.

• Language: Slovenian
• Keywords: lasersko varjenje, bakrove zlitine, vizualna kontrola, izvlečni preizkus, mikrotrdota
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [R. Čotar]
• Year: 2019
• Number of pages: XXIII, 71 str.
• PID: 20.500.12556/RUL-113016
• UDC: 621.791.725:669.35(043.2)
• COBISS.SI-ID: 16967195
• Publication date in RUL: 29.11.2019

ČOTAR, Robi, 2019, Določitev primerne metode za preverjanje kakovosti zvarnih spojev pri laserskem varjenju električnih kontaktov [online]. Master’s thesis. Ljubljana : R. Čotar. [Accessed 21 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=113016

Secondary language

• Language: English
• Title: Determination of appropriate quality testing method for laser beam welding of electrical contacts

Abstract

The objective of this thesis is to determine appropriate method for weld quality examination. Investigation was done on copper alloy CuCrSiTi electrical contact pins, which were joined using laser beam welding. When choosing weld examination method, its simplicity, short execution time and reliability is important. To experimentally determine weld quality, we used different weld testing methods, suitable for implementation in production process. Visual examination was performed using digital visual camera immediately after welding operation on production line. Welding joint was visually inspected again using digital microscope and special software on personal computer. When samples were visually examined with both methods, wire pull test was done. With this destructive test, pulling force was measured. The last experimental method was metallographic examination and microhardness measurement along the section of welding joint. The results showed that when using digital microscope, reliability of visual examination is improved in comparison to digital visual camera. However, investigation results showed that wire pull test is not appropriate for this application, because visual appearance of welding joint has no influence on measured pulling force.

• Keywords: laser beam welding, copper alloys, visual testing, wire pull test, microhardness