Application of Statistical Quality Control Technique for Process Control in Welding

Weld quality can be determined by different destructive and non-destructive tests. The tests are required to control the quality by variables as well as by attributes. In this paper, the specimens welded by submerged Arc Welding (SAW) are used for quality control and process control The test data from charpy impact test have been used for quality controls by variables and radiography test results are utilised to control the quality by attributes. For each of the above cases statistical analysis have been made and control lines (using X-R Chart and P-Chart) are drawn to determine whether the SAW process is within control or not The use of SQC technique for control of quality of welds in continous production saves money and time compared to other methods.