RT Journal Article
SR Electronic
A1 Arsić, Dušan
A1 Nikolić, Ružica
A1 Lazić, Vukić
A1 Aleksandrović, Srbislav
A1 Radović, Ljubica
A1 Ilić, Nada
A1 Hadzima, Branislav
T1 An Example of Reparatory Surface Welding of the Mining Machine Vital Part
JF Communications - Scientific Letters of the University of Zilina
YR 2021
VO 23
IS 1
SP B39
OP B45
DO 10.26552/com.C.2021.1.B39-B45
UL https://komunikacie.uniza.sk/artkey/csl-202101-0021.php
AB Mining machines' components, or the whole structure, are prone to frequent premature damages and fractures what is explained either by inadequate design and construction or by insufficient knowledge of the material's and welded joints' properties and oversights in manufacturing. Here is considered the bucket-wheel excavator, i.e. the fracture of the tooth of the girth gear, which enables the circular motion of the excavator's upper structure (which was in operation for 5000 hours). The gear was made of the cast steel GS 40 MnCrSi3 V. The reparatory hard-facing (HF) technology of the fractured tooth required specification of numerous operations including the preparation works. The reparation realized the two-fold savings, in time and money - the new girth gear costs over 500 000 € and its manufacturing lasts 6 to 9 months, while the safety and quality of the repaired tooth was guaranteed.