A manufacturer of heavy machinery was being crippled by excessive maintenance costs and continual disruptions on the production line. One of the culprits was the submerged (or sub) arc welding machine - which was failing on a regular basis.
A reliability study was performed on the machine, and it soon became clear that the manufacturer could reduce costs by up to 64%, or $139,886 per year.
This company produces dump trucks for the mining industry. With an annual turnover of $11.7 million globally, it is a major player in the manufacturing industry - and has a tightly scheduled production line to cope with ongoing demand.
A key piece of equipment on this production line is the sub arc welder, which is used to weld structural beams for the chassis frame. Yet the sub arc welder was continually failing - leading to lost production, issues with quality and an excess of scrap product. The company commissioned a reliability study that was geared towards creating an optimized strategy for maintenance, and thus improving the ongoing performance of the welder.
The company engaged ARMS Reliability to perform the reliability study.
Using reliability simulation software, a Reliability Centered Maintenance (RCM) model was built. As part of this, a Failure Modes Effects and Criticality Analysis (FMECA) was performed to identify all the likely and dominant failure modes, along with the effects of the failures.
From the study, an optimized maintenance plan was produced. This plan was predicted to reduce costs by $139,886 (64% compared to current practice) per year.
In addition, an annual maintenance budget prediction (labor and spares costs) for the sub arc welding machine over its lifetime was produced. Significantly, the study highlighted a particular failure mode - welding tip damage - which was previously underestimated, as it is a 'short duration, high frequency' problem. This failure mode was actually the largest contributor to cost over the lifetime of the sub arc welding machine, due to production losses and quality issues. By addressing this problem, the company experienced significant savings.
Overall, the investment in a reliability study for maintenance optimization reaped huge rewards for the company - and this was just for one piece of equipment on their production line.