Visual detection method and system for GTAW additive manufacturing stack height for image processing

Abstract

The invention provides a visual detection method and system for GTAW additive manufacturing stack height for image processing. The axis of a CCD camera is vertical to a plane formed by the axis of a GTAW welding gun and a threaded tube. The method comprises the following steps of: starting continuous image collection to calibrate a sensing system so as to determine the position of a tip of a tungsten electrode; determining the initial distance from the tip of the tungsten electrode to the surface of a substrate, and starting a GTAW electric arc and filler rod system; extracting surface characteristics of the tail of a weld pool of a deposition layer by means of a picture processing algorithm; calculating the mean square error of row-coordinates on the surface of the weld pool of the deposition layer of a corresponding row of adjacent continuous images, and determining the junction point of liquid and solid metals at the tail of the weld pool of the deposition layer by means of a threshold value method; and when the nth layer is stacked, calculating the total height of the deposition layer at the current moment according to the initial distance from the tip of the tungsten electrode to the surface of the substrate, the tip position of the tungsten electrode and the junction point of liquid and solid metals of the deposition layer. The method provided by the invention solves the problem that the GTAW additive manufacturing stack height is hard to detect in real time effectively, and has the advantages of being simple in detection process and intuitive and rich in amount of information.

Description

technical field [0001] The invention belongs to the technical field of arc-filled wire additive manufacturing, and in particular relates to an image processing-based visual sensing detection method and detection system for stacking height of tungsten inert gas shielded welding (Gas tungsten arc welding, GTAW) additive manufacturing. Background technique [0002] GTAW additive manufacturing is an important branch of arc-filled wire additive manufacturing technology. GTAW is used as the heat source, and metal wire is used as the filling material to form metal components layer by layer according to the set path. This technology has the advantages of small heat input and high forming precision, and is suitable for forming medium and large-sized metal components. At present, it is widely used in direct manufacturing of titanium alloy, stainless steel, nickel-based alloy and aluminum alloy components. [0003] In GTAW additive manufacturing, every time a layer is stacked, the wor...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of stacking defects caused by the inconsistency between the stacking height and the expected height in the GTAW additive manufacturing process, and to provide an image-processing GTAW additive manufacturing stacking height visual sensing detection method and system

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