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JWJ > Volume 27(5); 2009 > Article
Journal of KWJS 2009 October;27(5) :42-48.
Published online November 16, 2009.
Expectation of Bead Shape using Non-linear Multiple Regression and Piecewise Cubic Hermite Interpolation in FCA Fillet Pipe Welding
Dae-Won Cho, Suck-Joo Na, Mok-Young Lee


Correspondence:   Published online November 16, 2009
ABSTRACT
  Pipe welding is used in various ranges such as civil engineering and ship building engineering. Until now, many technicians work for pipe welding manually under harmful, dangerous and difficult conditions. So it is necessary to install automation process. For automation pipe welding, relation between welding parameters & bead shape should be considered. Using this relation, bead shape could be expected from welding parameters. FCAW was used in this study. Instead of pipe workpiece, fillet joint plate is used, which were inclined 0,45,90,135,180 degree. By analyzing between welding parameters (current, welding speed, voltage) and bead shape parameters with non-linear multiple regression, bead shape parameters could be expected. Piecewise Cubic Hermite Interpolation was used to expect smooth curved bead shape with bead shape parameters. From these processes, bead shape could be expected from welding parameters.
Keywords: Bead shape;Welding parameter;Non linear regression;Taguchi-method;Piecewise cubic Hermite interpolation
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