Analiza mikrostrukture i tvrdoće sučeono zavarenog spoja mig postupkom

undergraduate thesis

• Title (english): Microstructural and hardness analyses of welded joined by mig procedure
• Author: Erik Luka Ritz
• Mentor: Martina Lovrenić-Jugović (mentor)
• Committee member: Ivan Jandrlić (predsjednik povjerenstva)
• Committee member: Martina Lovrenić-Jugović (član povjerenstva)
• Committee member: Ljerka Slokar Benić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2022-09-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

U ovom završnom radu napravljen je teorijski pregled i to elektrolučnog postupka
zavarivanja s detaljnim opisom postupaka zavarivanja MIG metodom te pregled
metoda mjerenja tvrdoće s detaljnim opisom Vickersove metode mjerenja. Ploče
debljine 15 mm od konstrukcijskog čelika S235JR zavarene su sučeono K zavarom
primjenom MIG metode. Zavareni spojevi hlađeni su nakon zavarivanja na različite
načine, jedan je hlađen na zraku, a drugi u vodi. U eksperimentalnom dijelu završnog
rada na sučeono zavarenim pločama nakon pripreme najprije je napravljena
metalografska analiza mikrostrukture zavarenih spojeva, a zatim je izmjerena njihova
tvrdoća Vickersovom metodom. Provedenim metalografskim ispitivanjima zaključilo
se da zona utjecaja topline ima sitnozrnatu strukturu, a zona taljenja lijevanu strukturu.
Nakon mjerenja tvrdoće vidljivo je da vrijednosti tvrdoća rastu od korijena prema licu
zavara kako u zoni taljenja tako i u zoni utjecaja topline.

Abstract (english)

In this final paper, a theoretical overview of the electric arc welding process with a
detailed description of the MIG welding process and an overview of hardness
measurement methods with a detailed description of the Vickers measurement method
was made. The 15 mm thick plates made of structural steel S235JR are butt-welded
with K welding using the MIG method. Welded joints were cooled after welding in
different ways, one was cooled in air and the other in water. In the experimental part of
the final work on the butt-welded plates after preparation, a metallographic analysis of
the microstructure of the welded joints was first made, and then their hardness was
measured using the Vickers method. The conducted metallographic tests concluded that
the heat-affected zone has a fine-grained structure, and the melting zone has a cast
structure. After measuring the hardness, it is evident that the hardness values increase
from the root to the face of the weld, both in the melting zone and in the heat-affected
zone.

• Keywords: MIG metoda zavarivanja; konstrukcijski čelik; sučeoni K spoj; mikrostruktura; Vickersova tvrdoća
• Keywords (english): MIG welding method; structural steel; butt K joint; microstructure; Vickers hardness
• Language: croatian
• URN:NBN: urn:nbn:hr:115:041984
• Study programme: Title: Undergraduate study program Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Metallurgical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-08-30 09:06:35