Zaostale napetosti pri oblikovnem obločnem navarjanju konstrukcijskega jekla G3Si1

Veljanovski, Sanimir (author), Klobčar, Damjan (mentor)

Cilj dela je bil določiti vpliv procesnih parametrov pri oblikovnem obločnem navarjanju (WAAM) na zaostale napetosti. Z žico iz konstrukcijskega jekla G3Si1 premera 1,2 mm smo navarjali preproste geometrije na osnovni material. Teoretični del zajema opis procesa izdelave WAAM ter mehanizmov nastanka in merjenja zaostalih napetosti. Predstavljen je plan načrtovanja eksperimentov za izdelavo vzorcev s postopkom WAAM ter plan merjenja napetosti z metodo XRD. Rezultate smo analizirali glede na procesne parametre izdelave: jakost varilnega toka, medvarkovno temperaturo in strategijo izdelave. Jakost varilnega toka ima največji vpliv na zaostale napetosti. Strategija navarjanja ima velik vpliv na obliko navarka, saj se lahko zgodi, da nam z napačno strategijo navarjanja ne bo uspeli izdelati izdelka. Najmanjši vpliv na zaostale napetosti ima medvarkovna temperatura. Glede na rezultate eksperimentov priporočamo izmenično strategijo navarjanja s čim manjšim vnosom energije.

• Language: Slovenian
• Keywords: Oblikovno obločno navarjanje (WAAM), dodajalne tehnologije, navarjanje, zaostale napetosti, rentgenska odbojna metoda
• Work type: Master's thesis/paper (mb22)
• Tipology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2020
• Publisher: [S. Veljanovski]
• Number of pages: XXII, 56 str., [2] f. pril.
• UDC: 621.791.75:669.14:620.1(043.2)
• COBISS.SI-ID: 28819203
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Secondary language

• Language: English
• Title: Residual stress in WAAM welding of G3Si1 structural steel

Abstract

Master thesis focuses on influence of process parameters in the WAAM manufacturing on residual stress. We welded simple geometry to the base material – structural steel. Samples were manufactured by a MAG welding process using G3Si1 welding wire of 1.2 mm diameter. The theoretical part includes a description of the WAAM manufacturing process and measurement of residual stress. A plan of experiment for production of samples using WAAM and measuring residual stress using X-ray diffraction is presented. The results were analyzed on terms of process parameters: welding current, manufacturing strategy and welding temperature. Welding current has the highest influence on residual stress. The manufacturing strategy has a great influence on the shape of the weld. It can happen that with wrong strategy we will not be able to make a desired product. The smallest effect on residual stress has welding temperature. Based on experiments we recommend alternating strategy with lowest possible welding current.

• Keywords: Wire + Arc Additive Manufacturing (WAAM), additive manufacturing, welding, residual stress, X-Ray Diffraction