Vol.8, No1, 2008, pp. 13-22
 UDC 621.791.05:539.319

THE EFFECT OF RESIDUAL STRESSES IN WELDED JOINT ON THE FAILURE OF BUCKET WHEEL EXCAVATOR

Miodrag Arsić, Vujadin Aleksić 1

Zoran Radaković 2

1 Institute for Testing Materials IMS, Belgrade

2 Faculty of Mechanical Engineering, University of Belgrade

Abstract

The investigation of welded joint cracking revealed that residual stresses contribute to the failure of bucket wheel excavator SRs 1300.26/5+VR±10 in exploitation.

Testing for welded joints characterization (chemical composition, tensile properties, hardness and impact toughness of steel, electrodes and welded joints) and susceptibility to cracking assessment had been performed. Based on theoretical analysis of working and critical stresses, a model of bucket wheel excavator welded structure was developed and critical locations for strain gauge measurements were determined. Welding residual stresses were assessed as well as working stresses for different operating regimes of excavator and their effects on service failures.

Keywords: bucket wheel excavator, welded joints, working stresses, residual stresses

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