Vladimir Gliha (Author)

Abstract

Pri zelo kakovostnih soležnih zvarih spojin, ki so dinamično obremenjeni, nastanejo razpoke zaradi utrujenosti materiala zmeraj na prehodu temena vara v osnovi material, torej v TVP (toplotno vplivano področje) tik ob črti taljenja. Eksperimentalno delo je bilo opravljeno na vzorcih materiala TVP, ki so bili pripravljeni s simulacijo termičnih razmer pri varjenju. Primerjali smo trajno dinamično trdnost materiala TVP v razamerah koncentriranih napetosti in hitrost ohlajanja pri varjenju varka, ki material najbolj segreje, ter zadnjega vplivnega varka. Trajno dinamično trdnost materiala na prehodu je mogoče oceniti na osnovi njegove trdote. Pri dvovarkovnih TVP sta trajna in statična trdnost odvisni od zadnjega termičnega vpliva, ki material na prehodu segreje na temperaaturo ▫$Ac_3$▫. To je mogoče uporabiti za izboljšanje dinamične nosilnosti zvarnih spojev, ki so varjeni produktivno.

Keywords

varjenje;soležni zvarni spoj;prehod temena vara;razpoke;utrujenost materiala;ddinamična nosilnost;hitrost ohlajanja;prekristalizacija;produktivno varjenje;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Inštitut za kovinske materiale in tehnologije
UDC: 621.791.05:669.14.018.295:620.178.3
COBISS: 235178 Link will open in a new window
ISSN: 1580-2949
Parent publication: Materiali in tehnologije
Views: 1251
Downloads: 102
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Other data

Secondary language: English
Secondary title: Fatigue strength of a material at the weld toe of the weld joint on a high-strength structural steel
Secondary abstract: With high-quality butt-welded joints that are dynamically loaded, cracks caused by material fatigue originate at the toe of weld that is in the HAZ (heat affected zone) adjacent to the fusion line. The experimental work was carried out on samples from the HAZ material prepared by simulation of thermal conditions during welding. The endurance limit in the concentrated stress state was correlated with the cooling time of the thermally most intensive weld pass and the last one that affects microstructure. The weld-joint load-carrying capacity can be assesed by the use of hardness data. In the case of a double-cycle HAZ, the endurance limiti and the static strength depend on the last thermal influence that reheats the material at the toe above the ▫$Ac_3$▫ temperature. This can be successfully used for welded-joint load-carrying-capacity improvemen in production.
Secondary keywords: welding;butt-welded joint;fatigue crack;dynamic load-carrying capacity;cooling rate;recrystallization;productive welding;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 231-237
Volume: ǂLetn. ǂ34
Issue: ǂšt. ǂ5
Chronology: 2000
ID: 1749013