Determining Impact of Crack Width on the Repairing of Crack on the Surface of Carbon Steel by Welding Methods

What is it about?

One of the appropriate measures is to repair the surface crack of steel pipelines using different welding methods. Two variables of crack width and crack depth are common in all the repair methods. In this research, the first variable is the crack width and other variables are considered the second variables. Thus, the effect of crack width on the repairing of steel surface crack is determined using two repairing methods including flame spraying fusion welding and magnetic induction diffusion welding. The test results of these two methods are analyzed and then compared using the Taguchi test design method with one factor at one level (one-factor ANOVA). Investigating and analysis of the results showed that the contribution of crack width variable in flame spraying fusion welding and magnetic induction diffusion welding methods is 10.14% and 18.37% to achieving the tensile strength of base metal and 66.20% and 51.94% to achieving relative elongation in the base metal, respectively. Thus, to achieve tensile strength in the base metal, studying the effect of crack width is not enough by itself in both methods; however, to achieve relative elongation of the base metal, the most effective variable is crack width.

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Why is it important?

If pipelines are damaged or fail to function normally, downstream units will stop operation, daily activities will be disrupted, or the process will shut down. Awareness of and knowing about the condition of pipelines in service as well as recognizing the cause of failure and then taking timely measures to make appropriate changes can increase productivity.

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