Otpornost na prsline zavarenih TIG spojeva AlMg4.5Mn legure

Abstract

U ovom radu, zavareni spojevi AlMg4.5Mn legure, zavareni TIG postupkom, su testirani u cilju istraživanja njihove otpornosti na stvaranje prsline. Ploče, dimenzija 500 x 250 x 12 mm, su zavarene TIG procesom u horizontalno-vertikalnom položaju. Različite mešavine inertnih gasova su pripremljene i snabdevene od MESSER TEHNOGAS AD, Smederevo (Srbija), uključujući Ar, Ar + 0,015% N2, Ar + 15% He + 0,015% N2, Ar + 30% He + 0,015% N2, Ar + 50% He + 0,015% N2. Ispitivanjima bez razaranja su otkrivene greške zavarenih spojeva, poroznost, tipično za ovu vrstu legura. Šarpi epruvete sa zarezom postavljenim na različitim delovima zavarenog spoja, su ispitivane instrumentiranim klatnom sa mogućnošću razdvajanja energije inicijacije i rasta prsline. Otpornost na stvaranje prsline je određena statičkim (KIc) i dinamičkim ispitivanjem (rast zamorne prsline - Parisov zakon).

In this paper the AlMg4.5Mn TIG welded joints have been tested in order to investigate their cracking resistance. Testing plates, size of 500 x 250 x 12 mm, are welded by TIG procedure in a horizontal-vertical position. Various mixtures of inert gases are prepared and supplied by MESSER TEHNOGAS AD, Smederevo (Serbia), including Ar, Ar + 0.015% N2, Ar + 15% He + 0.015% N2, Ar + 30% He + 0.015% N2, Ar + 50% He + 0.015% N2. Non-destructive testing is used to check joint defects, primarily porosity, as typical for this type of alloys. The Charpy specimens, with the notch positioned in different regions of the welded joint, are tested using instrumented pendulum to separate crack initiation and growth energy. Crack resistance is evaluated by using static (KIc) and dynamic testing (Paris law - fatigue crack growth).