Fundamental Investigation of Optimum Penetration Control Method
Yuji Sugitani, Yasuhiko Nishi
One of the important subject in the study of automatic arc welding is to establish control system of welding parameters for controlling bead shape, namely penetration depth, bead width and bead height, by detecting or predicting behavior of molten pool owing to change of groove shape.
This report describes the effect of welding parameters on the bead shape and the study of simultaneous control system of penetration depth and bead height in the variation of root gap in gas metal arc welding. From the fundamental investigation of optimum penetration control method, following results were obtained.
1) By the method of controlling additional filler wire feeding rate in order to maintain constant torch height during automatic current control (ACC), the penetration depth and the bead height can be controlled constant at the variation of root gap width in Y-groove.
2) The penetration depth can be effectively controlled by the welding current control which is corelated to the welding speed control in order to keep constant bead height.
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