The Paton Welding Journal, 2013, №01



2013 №01 (03)

2013 №01 (05)

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The Paton Welding Journal, 2013, #1, 14-20 pages  

ALGORITHM OF TECHNOLOGICAL ADAPTATION FOR AUTOMATED MULTIPASS MIG/MAG WELDING OF ITEMS WITH A VARIABLE WIDTH OF EDGE PREPARATION

T.G. SKUBA, V.V. DOLINENKO, V.A. KOLYADA and E.V. SHAPOVALOV

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
Area of research is automation of the processes of multipass MIG/MAG welding of thick-walled items in the downhand position. Objective of research is producing a weld with specified width and reinforcement, not having any lacks-of-penetration or undercuts in the presence of external disturbing influences in the form of a change of geometrical parameters of butt edge preparation (cut-out area). Research task is development of technological adaptation algorithm, which ensures the specified height of welded layer. Research procedure is synthesis of mathematical model based on equations containing both phenomenological descriptions of the processes and regression dependencies. An algorithm is proposed for technological adaptation of butt edge preparation based on machine vision means for multipass MIG/MAG welding. The algorithm ensures calculation of automatic welding mode (voltage, current and speed of welding) in real-time, based on current geometrical parameters of edge preparation. The algorithm uses the developed mathematical of model «power source-arc of steady-state MIG/MAG welding process». In order to verify the algorithm, welding experiments were performed, in which a metal layer of constant thickness of 0.2cm with varying width of 2.0-3.3 cm was deposited on a steel plate. Range of variation of welding heat input is 4.0-8.5 J/cm with short-circuiting frequency of 5-54 Hz. No arc interruptions were observed, and defects of deposited layer macrostructure were absent. The proposed technological adaptation algorithm can be recommended for application in automatic control systems of multipass welding. 21 Ref., 8 Figures.
 
 
Keywords: multipass MIG/MAG welding, technological adaptation, layer of constant height, mathematical model, welding mode
 
 
Received:                26.07.12
Published:               28.01.12
 
 
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