Online diagnosis method of laser welding defects based on spectral information

A technology of laser welding and spectral information, which is applied in laser welding equipment, welding equipment, color/spectral characteristic measurement, etc., can solve the problems of time-consuming, laborious and increasingly demanding

Active Publication Date: 2017-09-15
HARBIN INST OF TECH AT WEIHAI
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  • Application Information

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Problems solved by technology

In recent years, with the rapid development of aerospace, automotive, microelectronics, light industry, medical and other industries, the shape of product parts has become more and more complex, and the requirements for the surface shape and deformation of welded components have become higher and higher. Traditional welding The method is difficult to

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  • Online diagnosis method of laser welding defects based on spectral information
  • Online diagnosis method of laser welding defects based on spectral information
  • Online diagnosis method of laser welding defects based on spectral information

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Embodiment 1

[0062] In this embodiment, the part 6 to be welded is made of 304 stainless steel, and the size of the part 6 to be welded is 100 × 50 × 3 mm. The form of the welded joint and the schematic diagram of the weld seam formed by laser welding are shown in Figure 3 (a) , Protected with Ar shielding gas 8 during the welding process.

[0063] Adjust the position of the fiber optic probe 3 so that during the laser welding process, the fiber optic probe 3 collects optical signals in the photoplasma with a wavelength of 200-1100 nm, and transmits the spectral information formed in the fiber optic spectrometer 1 to the computer 2 , by comparing the above spectral information, it is determined to use the 318-420nm spectral segment for analysis, so as to collect a spatial map reflecting the relationship between wavelength, time and intensity in the selected spectral segment, as shown in Figure 3(b). For the collected airspace map, based on the principles of high resolution, good profile, h...

Embodiment 2

[0071] In this embodiment, the part 6 to be welded is DX51D+Z galvanized steel sheet E, and the form of the welded joint is a lap joint with a reserved gap, that is, pads D are placed on both ends of the welded joint, and the pads The size of piece D depends on the actual demand, and the schematic diagram of the welding joint and the weld seam formed by laser welding is as follows: Figure 5 As shown, Ar shielding gas was used for protection during the welding process.

[0072]The fixed welding speed v=2.5m / min is unchanged, and different welding parameters are used for welding to determine the optimal welding parameters. At this time, the laser power P=3900W, the gap value is 0.2mm, the defocus is +15mm, Ar protection The air flow is 20L / min. Weld the five parts 6 to be welded under the optimal welding parameters to ensure that there is no accidental disturbance during the welding process and the weld seam is well formed. The computer 2 records the photoplasma generated by e...

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Abstract

The invention provides an online diagnosis method of laser welding defects based on spectral information. The method comprises the following steps: the position of an optical fiber probe is adjusted; information of a photoinduced plasma is acquired to determine a characteristic spectral line; an electronic temperature of the photoinduced plasma is calculated by using the characteristic spectral line to obtain an electronic temperature time domain map; according to materials and sizes of parts to be welded, different welding parameters are used for welding, and the parameter with the smallest standard difference of electronic temperature time domain change is selected as optimal welding parameter; the N parts to be welded are welded under the parameters to obtain N electronic temperature time domain maps so as to obtain a SPC control map; the welding parameters are adjusted according to actual conditions to adjust the parts to be welded to obtain the electronic temperature time domain maps as testing time domain maps; and the testing time domain maps are drawn in the SPC control map in real time to judge if welding defects exist through judging if each point in the testing time domain maps exceeds upper and lower boundaries of the SPC control map. The method can quickly and accurately judge if the defects exist in the laser welding process.

Description

technical field [0001] The invention relates to the field of online diagnosis of laser welding quality, in particular to an online diagnosis method of laser welding defects based on spectral information. Background technique [0002] Laser welding uses a high-energy-density laser as a heat source to melt metals to form welded joints. It is an efficient and precise welding method. In recent years, with the rapid development of aerospace, automotive, microelectronics, light industry, medical and other industries, the shape of product parts has become more and more complex, and the requirements for the surface shape and deformation of welded components have become higher and higher. Traditional welding The method is difficult to meet its needs, so laser welding has received extensive attention. In order to improve the efficiency of laser welding and reduce the defects of welded joints, the online diagnosis method of welding defects is indispensable. The traditional offline det...

Claims

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Application Information

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IPC IPC(8): B23K26/70G01N21/25B23K26/26
CPCB23K26/26B23K26/70B23K26/702G01N21/25
Inventor 陈波檀财旺陈远航杨凯姚永臻冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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