Strength Analysis of High Strength Steel Hydraulic Support

Abstract

Based on the importance and complex working environment of hydraulic support, welding residual stress (WRS) measurement to main components were carried out respectively by X-ray diffraction and the measured data were further analyzed theoretically. Tests were made on the gob shield and base for two times, each was measured before and after heat treatment respectively. The results indicate that WRS in the base are higher than that in the gob shield before heat treatment. After heat treatment, residual stress (RS) level of gob shield and base decreased significantly, WRS in every region keep at a lower level and regional RS differences become smaller. Therefore, heat treatment processes is an effective method to reduce RS of hydraulic support after welding. Through the test results we measured, got the real residual stress level of gob shield and base, which can provide the basis of experiment to search for an appropriate welding and heat treatment process.