Method for quantitatively identifying holes in leading wire melting trace

Abstract

The invention discloses a method for quantitatively identifying holes in leading wire melting trace. The method comprises the following steps: 1) extracting a leading wire sample with a melting trace; 2) judging whether the leading wire sample is a single stranded wire or not, and determining the equivalent diameter d0 of the unmelted segment of the leading wire; 3) extracting a leading wire melting trace sample, and detecting the mass ms of the melting trace sample by using an analytical balance; 4) detecting the volume Vs of the melting trace sample by using a buoyancy technology; 5) calculating the equivalent weight rho c of the melting trace; and 6) calculating the equivalent hole rate Pc of the melting trace. The volume of the leading wire melting trace sample is detected through the buoyancy technology, the diameter of the leading wire and the density of the melting trace sample are equivalently processed, and the equivalent hole rate of the holes in the leading wire melting trace is finally calculated, so the disadvantage of unable accurate quantitative detection of the hole rate in the melting trace of metallographic identification methods is made up, the quantitative identification of the holes in the melting trace is realized, and the accuracy of a material evidence identification result is increased.

Description

technical field [0001] The invention relates to the technical field of physical evidence identification of electrical fire melt marks, in particular to a quantitative identification method for inner holes of lead melt marks. Background technique [0002] The fire occurrence process is very complicated, a process involving physical and chemical changes, and a disaster caused by uncontrolled combustion. It has the highest frequency of occurrence among various disasters, is highly destructive, and has the greatest social impact. Among the fires that occur, electrical fires account for a large proportion, often causing huge economic losses and casualties. The situation of electrical fires in China has become more and more serious in recent years. [0003] Therefore, the Thirteenth Five-Year Plan for National Economic and Social Development clearly proposes to improve disaster prevention, mitigation and relief mechanisms, improve disaster investigation and evaluation, and strengt...

AI Technical Summary

Problems solved by technology

But this observation method is qualitative, because only one section of the melt line can be observed on the metallographic diagram, and quantitative identification cannot be achieved

[0008] Quantitative identification of pores will undoubtedly improve the accuracy of the identification results, but the appearance of the melting mark of the wire is extremely irregular, and the distribution of internal pores is very different. Identification difficulty

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