Elektroobločno varjenje pod praškom avstenitnega nerjavnega jekla

Plantan, Kristjan (author), Klobčar, Damjan (mentor)

Zvarni spoji pri elektroobločnem varjenju pod praškom avstenitnih nerjavnih jekel, morajo izpolnjevati visoke zahteve kakovosti. Lastnosti varnega spoja morajo biti primerne lastnostim osnovnega materiala. Postopek varjenja pod praškom se pogosto uporablja za potrebe nuklearne, živilske, kemične in mnogih drugih industrij, kjer je kakovost zvarnega spoja izjemno pomembna. Za doseganje optimalne kakovosti zvarnih spojev, je potrebno natančno načrtovati in kontrolirati tehnologijo varjenja. V nalogi smo naredili natančen izračun parametrov varjenja za varjenje materiala debeline 30 mm iz avstenitnega nerjavnega jekla EN 1.4301/AISI304 in materiala debeline 70 mm iz avstenitnega nerjavnega jekla EN 1.4541/AISI 321. Kot dodajni material smo pri obeh primerih uporabljali avstenitno nerjavno jeklo EN 1.4404/AISI 316L. Pri načrtovanju tehnologije varjenja smo bili posebno pozorni na čas ohlajanja t8/5, zaradi katerega prihaja v materialu do faznih sprememb. Po končanem varjenju smo iz izdelanih vzorcev opravili meritve delta ferita, natezni in upogibni preizkus ter preizkus udarne žilavosti, ki so nam dali informacije o kakovosti zvarnega spoja in primernosti dodajnega materiala za varjenje. Ugotovili smo da je izdelan var dobre kakovosti ter da je izbran material primeren za varjenje na osnovni material.

• Language: Slovenian
• Keywords: varjenje pod praškom, EPP, elektro obločno varjenje, avstenitno nerjavno jeklo, čas ohlajanja, zvari delta ferit
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [K. Plantan]
• Year: 2019
• Number of pages: XXI, 54 str.
• PID: 20.500.12556/RUL-111758
• UDC: 621.791.75:669.14(043.2)
• COBISS.SI-ID: 16976155
• Publication date in RUL: 12.10.2019

PLANTAN, Kristjan, 2019, Elektroobločno varjenje pod praškom avstenitnega nerjavnega jekla [online]. Bachelor’s thesis. Ljubljana : K. Plantan. [Accessed 16 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=111758

Secondary language

• Language: English
• Title: Submerged arc welding of austenitic stainless steel

Abstract

Welded joints, made with submerged arc welding under the powder of austenitic stainless steels, must meet high-quality requirements. The properties of the weld must be as good as those of the base material. The welding process is widely used for the needs of nuclear, food, chemical and many other industries, where the quality of the weld is extremely important. To achieve the optimum quality of welds, it is necessary to carefully design and controls the welding technology. Our task was to accurately calculate the welding parameters for welding on 30 mm thick plate made of austenitic stainless steel EN 1.4301 / AISI304 and 70 mm thick plate made of austenitic stainless steel EN 1.4541 / AISI 321. In both cases, austenitic stainless steel EN 1.4404 / AISI 316L was used as supplementary material. When designing the welding technology, we paid special attention to the cooling time t8/5, which causes phase changes in the material. After welding was completed, delta ferrite measurements, tensile and flexural tests, and impact toughness tests were performed from the fabricated samples, which gave us information on the quality of the weld and the suitability of the welding material. We found that the weld was good quality and that the selected material was suitable for application to the base material.

• Keywords: powder welding, SAW, submerged arc welding, austenitic stainless steel, cooling time, welds, delta ferrite