Method for measuring temperature field in laser welding process

A technology of laser welding and measurement method, applied in the field of measurement, which can solve the problems that the temperature field cannot be practically applied, the inability to distinguish the infrared radiation energy from the measurement target surface or from these gases, and the error of measurement results.

Active Publication Date: 2013-03-13
BEIJING AERONAUTICAL MFG TECH RES INST
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the specific technical field of laser welding, the welding process will be accompanied by strong metal vapor/plasma radiation, and the temperature of metal vapor/plasma can reach above 8000°C. According to the law of black body radiation, these radiation bodies will be measured by infrared thermal imaging The wavelength band of the response produces a strong infrared radiation signal, which will enter the infrared thermal image, and the system cannot distinguish whether it comes from the measurement target surface or the infrared radiation energy from these gases, resulting in a large error in the measurement results
Therefore, although the infrared thermal imaging camer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The temperature calibration method of the infrared thermal image in the laser welding process, the steps are:

[0032] (1) First prepare the welding test piece: the material grade is TA15, the thickness is 2.5mm, the test piece is a flat test piece with a length of 200mm and a width of 150mm, draw an obvious position mark on the welding position of the test piece, and weld The middle welding trajectory must pass through this point, and when the thermal image is taken with an infrared camera, the thermal image of this position can be taken, and a clear position can be given on the image.

[0033] Then select the laser welding parameters: use the TL4000YAG laser produced by Trumpf, the laser wavelength is 1.06 microns; use argon as the shielding gas during welding, the welding power is 2800W, and the welding speed is 2 m / min.

[0034] The test uses an infrared thermal imager: a thermal imager of the type FLIR325 produced by Sweden FLIR Company and its corresponding softwa...

Embodiment 2

[0044] The temperature calibration method of the infrared thermal image in the laser welding process, the steps are:

[0045] (1) First prepare the welding test piece: the material grade is aluminum-lithium alloy 5A90, the thickness is 2mm, the test piece is a flat test piece with a length of 200mm and a width of 150mm, and a clear position mark is drawn on the welding position of the test piece. The welding track in the welding must pass through this point, and when the thermal image is taken with the infrared camera, the thermal image of this position can be taken, and a clear position can be given on the image.

[0046] Then select the laser welding parameters: use the TL4000YAG laser produced by Trumpf, the laser wavelength is 1.06 microns; use argon as the shielding gas during welding, the welding power is 2800W, and the welding speed is 1.2 m / min.

[0047] The test uses an infrared thermal imager: a thermal imager of the type FLIR325 produced by Sweden FLIR Company and i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Melting temperatureaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of measurement and relates to a method for measuring a temperature field in a laser welding process. In the laser welding process, a fusion line of a welding joint section and a represented temperature value (a material melting point temperature value) during metal welding are utilized, so that a method for measuring the temperature field in the laser welding process is designed, the thermal imagery and temperature field obtained by utilizing the conventional thermal infrared imager and software processing system thereof are accurately calibrated, and the important problems that the result of the temperature field obtained by the conventional thermal infrared image system has a large error compared with the actual result and an accurate calibration is absent because of the influence of essential factors such as metal steam/plasma radiation, fast temperature change and the like during the current laser welding are solved. The obstacle in the process of measuring the laser welding temperature field by utilizing the thermal infrared imager at present is offset, and a way is provided for accurately measuring the temperature field distribution of a fusion zone and a thermal influence area in the laser welding process.

Description

technical field [0001] The invention belongs to the technical field of measurement, and relates to a method for measuring a temperature field in a laser welding process. Background technique [0002] Due to the fast heat propagation speed in metal materials, the heat source density is highly concentrated during laser welding, so the temperature field during welding is very uneven, especially due to the existence of high-temperature metal vapor / plasma, liquid molten pool, solid heat-affected zone and In the solidification cooling area, even for the welding of the same material, the temperature difference in these areas is very large, such as the temperature of metal vapor / plasma can be as high as 8000 ° C, while the temperature of the solidification area may be several hundred degrees, and the melting point of the material to be welded There is a big difference, for example, the melting point of aluminum alloy is about 600°C, while that of titanium alloy is about 1700°C. The...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01J5/00B23K26/20B23K26/24
Inventor 段爱琴巩水利张朴陈新松姚伟王彬
Owner BEIJING AERONAUTICAL MFG TECH RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap