Abstract
This article evaluates the efficacy of a tool developed in the Monte Carlo simulation and referred to as control chart. This tool is used in order to detect changes in productivity resulting from the occurrence of a given event during the welding of land pipelines with self shielded flux cored wire (FCAW). The elaboration of this control chart is based on the data from the Cumulative Probability Density Function (CDF) curve, and generated in the Monte Carlo simulation using version 6 of the Palisade Corporation’s @Risk software for Excel, in a sample with productivity data from 29 welded joints, gathered through direct observation which considers the productive and unproductive times. In order to evaluate the control chart efficacy, the performance of welding productivity with a FCAW process with low alloy steels has been assessed during 29 days, summing up to 842 welded joints registered on “Relatorios Diarios de Obras” (Construction Works Daily Reports). The results show that the model developed for the control chart elaboration is effective in monitoring the productivity of the observed welding procedure.
Highlights
Welding is the main productive process in construction works of land pipelines
The establishment of the upper quota in 90% of the Cumulative Probability Density Function (CDF) is due to the fact that values near 100% in the curve generated in the simulation present productivity results that do not represent a real productive process
The productivity data from the Construction Works Daily Report gathered during 29 production days have been inserted to assess the Control Chart capacity to detect variations in the welding productivity
Summary
Welding is the main productive process in construction works of land pipelines. The activities that compose the work process are described as: direct or productive work, support work and unproductive work [7] [8] Another classification [9], the activities may be categorized in direct work, preparatory work, tools and equipment, material handling, waiting, travel, personal. Direct work comprises welding and grinding activities and all the other activities are considered as nonproductive time. These activities are: wire changing, column positioning, idle time between activities, waiting time and handling of tools.
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