A Study on Prediction of Welding Quality for Verticalposition Welding Using Mahalanobis Distance Method

Khairul Muzaka; Min-Ho Park; Jong-Pyo Lee; Byeong-Ju Jin; Do-Hyeong Kim; Ill-Soo Kim

Abstract

A vertical-position welding is generally defined as a weld that is applied to a vertical surface or one that is inclined 45 degrees or less. Arc welding on a vertical surface is much more difficult than welding in the flat or horizontal position due to the force of gravity which caused to welding faults. Furthermore, welding faults will effect decreasing the quality of the weld. Until now, arc welding process has been employed to an off-line method to detect welding fault. Also, it is quite difficult to increase the productivity as well as to reduce the production cost. To solve those problems, optimal algorithm for on-line monitoring system which based on Mahalanobis Distance (MD) method was proposed in this study. First, three different setting of Contact Tip to Working Distance (CTWD) were chosen 15, 20 and 25mm and found the optimal CTWD for automatic welding process. It was confirmed that MD verification based on optimized CTWD could be achieved the good welding quality and bead geometries which satisfied American Welding Association (AWS) standard.

Keywords

On-line monitoring system, Mahalanobis distance, Vertical welding, Welding quality, Fault weld.

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Cites this article as

K. Muzaka, M. Park, J. Lee, B. Jin, D. Kim, I. Kim, "A Study on Prediction of Welding Quality for Verticalposition Welding Using Mahalanobis Distance Method", International Journal of Innovative Research in Engineering & Management (IJIREM), Vol-3, Issue-3, Page No-154-159, 2016. Available from:

Corresponding Author

Khairul Muzaka

Department of Mechanical Engineering, Mokpo National University, 61, Dorim-ri, Chungkye-myun, Muan-gun, Jeollanam-do 534-729, Republic of Korea *Corresponding author Tel: +82-61-450-2416, Fax: +82-61-452-6376