High-nitrogen steel arc additive system based on high-speed vision and electrical parameter cooperative sensing control and control method thereof

Abstract

The invention provides a high-nitrogen steel arc additive system based on high-speed vision and electrical parameter cooperative sensing control and a control method thereof. The system comprises an additive robot, a CMT power supply, a CMT welding gun, a laser, a high-speed camera, an electrical signal acquisition unit and an upper computer controller; and the high-speed camera and the laser arefocused at the tail end of a welding wire and used for collecting a molten drop transition image, and the upper computer controller is used for receiving the molten drop image collected by the high-speed camera and current and voltage waveforms collected by the electric signal collecting unit and extracting the molten drop size in the image. The arc additive method comprises the steps that moltendrops formed in the pulse stage are made to complete transition in the CMT stage, then the diameter of the molten drops formed in the pulse stage serves as feedback quantity through the upper computercontroller, and pulse peak current time and pulse peak current magnitude serve as control quantity; and on the basis that good forming of each deposited metal is guaranteed, splashing caused by explosion due to too large molten drops is reduced, the high-nitrogen steel welding wire arc additive stability is improved, and the splashing clearing workload is reduced.

Description

technical field [0001] The invention relates to the field of metal arc additive manufacturing, in particular to a high-nitrogen steel arc additive system based on high-speed vision and electric parameter cooperative sensing control and a control method thereof. Background technique [0002] High-nitrogen steel refers to ferritic steel with a nitrogen content of more than 0.08% or austenitic steel with a nitrogen content of more than 0.4%. Among them, high-nitrogen austenitic stainless steel uses nitrogen as the main austenitizing element to replace the increasingly expensive nickel element, so as to achieve the purpose of reducing costs. High nitrogen austenitic stainless steel has (1) lower cost; (2) high yield strength, tensile strength and good ductility; (3) high strain hardening potential; (4) high fracture toughness; (5) resistance to forming deformation Induced martensite; (6) good corrosion resistance; (7) a series of advantages such as low magnetic permeability, th...

AI Technical Summary

Problems solved by technology

[0003] Due to its own compositional characteristics (high nitrogen, high manganese), high nitrogen steel welding wire is easy to form a large amount of spatter under the conditions of metal arc additive process, which greatly increases the cleaning workload and the probability of defects

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