The influence of welding parameters in MIG welding of aluminium alloy EN AW 1050

Abstract

Tema ovog završnog rada je „Utjecaj parametara pri MIG zavarivanju aluminijeve legure EN AW 1050“. Rad se sastoji od teorijskog i eksperimentalnog dijela. U teorijskom dijelu rada navedena je podjela na gnječene i lijevane aluminijeve legure te njihovo označavanje. Opisani su postupci zavarivanja aluminijevih legura s naglaskom na MIG postupak. Navedeni su zaštitni plinovi te izbor dodatnih materijala koji bitno utječu na svojstva zavarenih spojeva. Detaljno je opisan AC MIG postupak zavaravanja te njegove prednosti i nedostatci. Prikazane su i opisane najčešće nepravilnosti koje se pojavljuju tijekom postupka zavarivanja. U eksperimentalnom dijelu provedeno je zavarivanje četiri uzorka aluminijeve legure AW 1050. Za zavarivanje aluminijevih limova korišten je automatizirani MIG postupak zavarivanja. Brzina zavara, protok plina i udaljenost sapnice od radnog komada bili su konstantni, a mijenjala se vrsta plina i debljina zavara. Uzorci su nakon zavarivanja bili rezani, brušeni i polirani. Nakon nagrizanja uzoraka provedena je makroskopska analiza uzoraka u svrhu uvida strukture i svojstava zavarenih spojeva. Na temelju rezultata doneseni su zaključci.The topic of this graduate thesis is „Influence of parameters during MIG welding of aluminium alloy EN AW 1050“. The paper consists of a theoretical and an experimental part. The theoretical part presents the classification into wrought and casting aluminium alloys and their designation, The welding procedures of aluminum alloys are described, with an emphasis on the MIG procedure. Shielding gases and the choice of additional materials that significantly affect the properties of welded joints are listed. The AC MIG welding process and its advantages and disadvantages are described in detail. The most common irregularities that appear during the welding process are shown and described. In the experimental part, four samples of aluminum alloy AW 1050 were welded. The automated MIG welding process was used for welding aluminum sheets. The welding speed, gas flow and the distance of the nozzle from the workpiece were constant, while the type of gas and the thickness of the weld were changed. After welding, the samples were cut, ground and polished. After etching the samples, a macroscopic analysis of the samples was carried out in order to see the structure and properties of the welded joints. Based on the results, conclusions were drawn