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Device and method for evaluating welding process performance of gas-shielded welding wire

A technology of welding process and evaluation device, which is applied in the field of welding process performance evaluation, and can solve the problems of incomplete performance evaluation of gas shielded welding wire

Active Publication Date: 2019-03-29
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of incomplete performance evaluation of gas-shielded welding wire, and use the advantages of high-speed acquisition and fast storage of the signal acquisition system to propose a gas-shielded wire with low implementation cost, wide application range, high accuracy and good reliability. Welding wire welding process performance evaluation method and device

Method used

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  • Device and method for evaluating welding process performance of gas-shielded welding wire
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  • Device and method for evaluating welding process performance of gas-shielded welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as Figure 7 Shown is an example of the evaluation of the welding process performance of the solid gas shielded welding wire 8 . The test conditions include: using a digital CCD high-speed camera 1 and auxiliary light source 2 4 to align the ends of the solid gas shielded welding wire 8 from both sides of the solid gas shielded welding wire 8; the auxiliary light source 2 4 has an illuminance of 4×10 5 Lux xenon lamp light source, high-speed camera 1 with aperture value F of 1 / 8, exposure time of 10μs, resolution of 256×256, and frequency of 7kHz; supporting optical filter system 2 includes a UV mirror, and a transmittance of 50% light reduction film, a filter with a center wavelength of 1100nm; the sampling frequency of the signal synchronous recorder 15 is 40kHz; the welding workpiece is low carbon steel with a thickness of 20mm; the average welding current is 300A, and the average arc voltage is 32.5V , welding speed V w 30cm / min, the length L of the welding w...

Embodiment 2

[0057] Such as Figure 8 Shown is an example of the evaluation of the welding process performance of the flux cored gas shielded welding wire 8. The test conditions include: using a digital CCD high-speed camera 1 and an auxiliary light source-3 to align the end of the flux-cored gas-shielded welding wire 8 from the same side of the flux-cored gas-shielded welding wire 8; the auxiliary light source-3 is a laser with a power of 30w Light source, the high-speed camera 1 has an aperture value F of 1 / 16, an exposure time of 25ms, a resolution of 512×512, and a frequency of 8kHz; the supporting optical filter system 2 includes a UV mirror and a UV mirror with a transmittance of 50%. A light-reducing film, a filter mirror with a center wavelength of 808nm; the sampling frequency of the signal synchronous recorder 15 is 40kHz; the welding workpiece is low carbon steel with a thickness of 20mm; the average welding current is 260A, the average arc voltage is 30V, and the welding speed ...

Embodiment 3

[0060] Such as Figure 9 Shown is an example of gas explosion splash detection, and the test conditions are the same as in Example 1. in, Figure 9 In (a), a droplet is formed at the end of the welding wire, and the droplet grows up with time, and the metallurgical reaction inside it produces a large amount of gas, which makes the droplet expand like a balloon inflated, see Figure 9 (b) and 9(c). When the surface tension of the outer surface of the droplet cannot suppress the internal gas pressure, the droplet explodes and forms a gas explosion splash, such as Figure 9 (d) and 9(e). The occurrence of gas explosion splash like this reflects that the alloy composition of the gas shielded welding wire is easy to generate gas, and there are many low melting point chemical elements, which is not conducive to the stability of the welding process of the 8 major specifications of the gas shielded welding wire.

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Abstract

The invention discloses a device and a method for evaluating the welding process performance of a gas-shielded welding wire. The device comprises a high-speed camera, an optical filter system, an auxiliary light source, an air-shielded welding system, an arc voltage and welding current sensor, a signal synchronization recorder, a computer and the like; the method comprises the following steps thatthe high-speed camera and the signal synchronization recorder are adopted to synchronously acquire a welding image, arc voltage and welding current in the welding process of the gas-shielded weldingwire to be detected, signal processing is carried out through a computer, the standard deviation of the arc voltage and the welding current, the globular transfer mode, the size and frequency, the welding spattering form and the generation frequency are detected, and meanwhile, the wettability angle and the symmetry degree of a weld joint section after welding are measured, and the arc stability of the gas-shielded welding wire, the globular transfer behavior and the molten bath fluidity are detected, and finally, the welding process performance of the gas-shielded welding wire is evaluated according to the three indexes. The method is wide in application range, high in accuracy, low in implementation cost and good in reliability.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding process performance evaluation method and device for welding wire used for gas metal shielded welding. Background technique [0002] The gas metal shielded welding method (referred to as metal gas shielded welding) is an arc welding method that uses the arc heat generated between the welding wire and the workpiece to melt the welding wire and the base metal of the workpiece under the protection of active or inert gas. During the welding process, the welding wire melts under the heat of the arc to form liquid droplets, and transitions to the liquid pool on the base metal in a certain way, and finally solidifies with the liquid metal formed by melting the base metal to form a weld, thereby realizing butt welding Groove filling. [0003] When welding wires obtained by different element compositions or different preparation methods are used for welding, due to their diffe...

Claims

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Application Information

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IPC IPC(8): B23K31/12B23K9/173
CPCB23K9/173B23K31/12
Inventor 朱杰王加友蒋达童圆王定洲
Owner JIANGSU UNIV OF SCI & TECH
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