Welding heat affected zone micro-zone mechanical property detection method

Abstract

The invention discloses a welding heat affected zone micro-zone mechanical property detection method. The method comprises the following steps that: 1, a plurality of unit sample contours are sequentially and continuously marked along the direction of a welding seam, and a plurality of unit samples are sequentially arranged in a staggered manner from a welding seam zone to a base metal zone on one side along the vertical direction of the welding seam, each unit sample is of a double-end paddle plate type structure with a narrow middle part and two wide ends along the extension direction of the welding seam, the middle part is a stretching stress section, the two ends form a first clamping end and a second clamping end during stretching, the middle main body of the stretching stress section is a rectangular strip part, the long edge of one side of the rectangular strip part of the first unit sample is attached to a fusion line, and the long edge of the other side of the rectangular strip part is located in each welding heat affected zone, the width of the rectangular strip part is not less than the dislocation size of the adjacent unit samples; 2, cutting is performed along the contours, necessary polishing is carried out, so that a plurality of sheet-shaped unit samples are obtained; and 3, stretching detection is carried out on each unit sample by taking the two clamping ends as clamping points respectively, so as to obtain stretching mechanical property data of the specific micro-region tissue state of each heat affected zone.

Description

technical field [0001] The invention belongs to the metal material welding heat-affected zone detection technology, in particular to a welding heat-affected zone micro-zone mechanical property detection method. Background technique [0002] The welded joint of metal materials mainly includes the weld zone and the heat-affected zone, and their properties directly determine the performance of the entire welded joint, especially the welded heat-affected zone is a region with very uneven organization and performance, which becomes the performance of the entire welded joint weak area. For low-carbon steel or low-alloy steel, it can be divided into superheated zone, phase change recrystallization zone, incomplete recrystallization zone and recrystallization zone according to the heating peak temperature and structure characteristics under normal circumstances. The heating peak temperature of the superheated zone is at the solidus Between 1100℃ and 1100℃, the width is about 1-3mm....

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Problems solved by technology

[0003] In general, the mechanical properties of welded joints, especially the tensile properties, are tensile tested by processing the transverse tensile specimens of the welded joints. The results obtained reflect the macroscopic mechanical properties of the entire welded joint, and cannot be specific to a specific area. Performance, in order to understand the tensile mechanical properties of each micro-zone in the welding heat-affected zone, the specific welding heat cycle curve is used to simulate the welding heat cycle experienced by the material in the welding heat-affected zone thermal simulation test, and then the thermal simulation The tensile test of the sample is carried out to obtain the tensile mechanical properties of a microstructure in the welding heat-affected zone, but this not only requires a professional thermal simulation testing machine, but also the thermal simulation is only for the thermal cycle experienced by the actual welding heat-affected zone approximate description of

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