극박 다이아프램의 펄스 GTAW 공정 최적화에 관한 연구 (Study on the Optimization of Pulse GTAW Process for Diaphragm with Thin Thickness)

서지정보

· 발행기관 : 대한용접접합학회
· 수록지 정보 : 대한용접접합학회지 / 26권 / 1호 / 63 ~ 68페이지
· 저자명 : 박형진, 강문진, 이세헌, 황인성

초록

This paper has aimed to prevent excessive heat input by controlling arc distribution and heat input
capacity with pulse GTAW in order to improve weld quality in 0.08mm pressure gauge diaphragm and
flange welding parts. A design of experiment was designed using Box-Behnken method to optimize a
welding process. The pulse GTAW parameters such as pulse current, base current, pulse duty, frequency
and welding speed were set to input variables while hydraulic pressure that represents welding
characteristics in diaphragm and flange joint were set to output variables. Based on the test result, a
second regression equation was obtained between input and output variables and turned out significant.
Besides, an influence of parameters has been confirmed through response surface analysis using the
second-order regression equation and optimum welding condition was obtained through a grid-search
method. The optimum welding condition was set to pulse current 84.4(A), base current 29.6(A), pulse duty
58.8(%), frequency 10(%), and welding speed 596(mm/min). Then, decent bead shape was acquired with
no excessive heat input under the 2.3kgf/cm2 of hydrostatic pressure.

영어초록

This paper has aimed to prevent excessive heat input by controlling arc distribution and heat input
capacity with pulse GTAW in order to improve weld quality in 0.08mm pressure gauge diaphragm and
flange welding parts. A design of experiment was designed using Box-Behnken method to optimize a
welding process. The pulse GTAW parameters such as pulse current, base current, pulse duty, frequency
and welding speed were set to input variables while hydraulic pressure that represents welding
characteristics in diaphragm and flange joint were set to output variables. Based on the test result, a
second regression equation was obtained between input and output variables and turned out significant.
Besides, an influence of parameters has been confirmed through response surface analysis using the
second-order regression equation and optimum welding condition was obtained through a grid-search
method. The optimum welding condition was set to pulse current 84.4(A), base current 29.6(A), pulse duty
58.8(%), frequency 10(%), and welding speed 596(mm/min). Then, decent bead shape was acquired with
no excessive heat input under the 2.3kgf/cm2 of hydrostatic pressure.

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