• Title/Summary/Keyword: Welding speed

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A Study on the Optimal Welding Condition for Root-Pass in Horizontal Butt-Joint TIG Welding (수평자세 맞대기 TIG 초층용접에서 최적용접조건의 선정에 관한 연구)

  • Jung, Sung Hun;Kim, Jae-Woong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.4
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    • pp.321-327
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    • 2017

  • In this study, to investigate the shape of the back bead as a weld quality parameter and to select the optimal condition of the root-pass TIG welding of a horizontal butt-joint, an experimental design and the response surface method (RSM) have been employed. Three parameters are used as input variables, which include the base current, peak current, and welding speed. The back bead width is selected as an output variable representing the weld quality, the target value of the width is 5.4 mm. Conducting the experiments according to the Box-Behnken experimental design, a $2^{nd}$ regression model for the back bead width was made, and the validation of the model was confirmed by using the F-test. The desirability function was designed through the nominal-the-best formula for the appropriate back bead width. Finally, the following optimal condition for welding was selected using the RSM: base current of 0.9204, peak current of 0.8676, and welding speed of 0.3776 in coded values. For verification, a test welding process under the optimal condition was executed and the result showed the back bead width of 5.38 mm that matched the target value well.

  • https://doi.org/10.3795/KSME-A.2017.41.4.321 인용 PDF KSCI