Longitudinal connection method of weld bead in wire and arc additive manufacturing

Abstract

The invention provides a longitudinal connection method of a weld bead in wire and arc additive manufacturing, and belongs to the technical field of automatic manufacturing. The longitudinal connection method comprises the steps that firstly, pre-experiment is carried out on a wire and arc additive manufacturing platform to determine a value range of welding speed and wire feeding speed; then within the value range, a formal experiment is carried out, and the wire feeding speed, the welding speed and the height and width of accumulated weld bead results obtained each time are recorded; according to the recorded results, the height and the width are separately subjected to regression fitting to obtain a longitudinal stacking model of the weld bead; and when used, the required width and height are substituted into the model for solution, and if the solution satisfies the set value range, then welding is performed according to the calculated wire feeding speed and welding speed to realizethe longitudinal connection of the weld bead. The longitudinal connection method can establish a relatively accurate relationship between the welding speed and the wire feeding speed on the width andheight of the longitudinal accumulation results of the weld bead in the wire and arc additive manufacturing, improves the forming quality of the parts, and achieves a good wire and arc additive manufacturing effect.

Description

technical field [0001] The invention relates to a method for longitudinally connecting weld beads in arc additive manufacturing, and belongs to the technical field of automatic manufacturing. Background technique [0002] Additive manufacturing is the process of obtaining data from a three-dimensional model, usually by stacking and stacking layers, and connecting materials to create objects. It has strong equipment versatility, simple process steps, short manufacturing cycle, complex parts can be manufactured, and material utilization rate High, low manufacturing costs and other advantages, suitable for small batches, flexible production mode of multiple varieties. The range of materials used in additive manufacturing is very wide, including polymers, metals, ceramics, sand, glass, biological materials, etc., among which the most commonly used materials are polymers and metals. Compared with traditional additive manufacturing, the functional parts produced by metal additive...

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Problems solved by technology

[0004] However, most of the existing studies on process parameters and forming dimensions are limited to welding, and the weld size accounts for a small part of the overall size in the welding process; while in the WAAM process, the entire formed part is welded by metal, so the current The relationship between process parameters and molding dimensions in most of the studies is not applicable, and good welding results cannot be obtained in practical applications

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