A Quantitative Evaluation Method for Extrusion Welding Quality of Aluminum Profiles

Abstract

The invention discloses a quantitative evaluation method for aluminum profile extrusion welding quality. The method comprises the following steps of: performing mesh division and extrusion parameter setting on an established three-dimensional extrusion model, and performing numerical simulation on an aluminum profile extrusion welding process, so as to obtain a material flowing pattern of the whole extrusion and welding process of a metal flow; extracting data information of all welding points on a welding surface, namely a pressure, stress and three-dimensional coordinates; processing extracted data information, so as to obtain discrete three-dimensional coordinate points; and fitting the obtained discrete three-dimensional coordinate points into a smooth curved surface, and obtaining a volume of a spatial body enclosed by the fitted surface and a bottom vertical projection. According to the method provided by the invention, the extrusion welding quality evaluation is expanded from a two-dimensional model to a three-dimensional model, welding quality evaluation is expanded from using data of only one welding line to using data of the whole welding surface, and a basic qualitative description is expanded to an accurate quantitative description, thereby implementing a quantitative evaluation on the extrusion welding quality of three-dimensional hollow profiles.

Description

technical field [0001] The invention belongs to the technical field of metal profile extrusion, and particularly relates to a quantitative evaluation method for aluminum profile extrusion welding quality, which is used to accurately and quantitatively evaluate the profile welding quality in the aluminum profile extrusion process. Background technique [0002] Due to its low density, good appearance, high specific strength, and good corrosion resistance, aluminum alloy profiles have been widely used in rail transit, aerospace, automobiles, ships, electric power, energy, construction and other fields. According to statistics, in 2012, the global output of aluminum processing materials reached 48 million tons, of which more than 19.5 million tons of extruded materials, and aluminum profiles continue to develop in the direction of large-scale, thin-walled, flat-wide and complex sections. The proportion is increasing [Liu Jingan, Development characteristics and market analysis of...

AI Technical Summary

Problems solved by technology

However, most of the current simulation studies on extrusion welding are limited to the two-dimensional extrusion process of symmetrical hollow profiles with simple cross-sectional shapes, and there are few welding quality evaluation studies on the three-dimensional extrusion process of aluminum profiles.

In addition, most of the current quantitative research on welding criteria still stays in the simplified two-dimensional model, that is, the calculation is the Q value or K value corresponding to a welding path on the welding surface, and there is no use of the entire welding surface. Real quantitative research on the quality of 3D extrusion welds with all the weld point data

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