摘要：An effective operations of a projection spot welding (PSW) machine is closely related to the effectiveness
of the maintenance. Timely maintenance can prevent failures and improve reliability
and maintainability of the machine. Therefore, establishing the maintenance frequency for the
welding machine is one of the most important tasks for plant engineers. In this regard, reliability
analysis of the welding machine can be used to establish preventive maintenance intervals (PMI)
and to identify the critical parts of the system. In this reliability and maintainability study, analysis
of the PSW machine was carried out. The failure and repair data for analysis were obtained from
automobile manufacturing company located in Uzbekistan. The machine was divided into three
main sub-systems: electrical, pneumatic and hydraulic. Different distributions functions for all subsystems
was tested and their parameters tabulated. Based on estimated parameters of the analyzed
distributions, PMI for the PSW machines sub-systems at different reliability levels was calculated.
Finally, preventive measures for enhancing the reliability of the PSW machine sub-systems are
suggested.
