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Method for controlling the quality of laser-welding processes, control system and program product therefor

A laser welding, quality technology, used in laser welding equipment, welding equipment, manufacturing tools, etc.

Inactive Publication Date: 2008-09-17
CENT RICERCHE FIAT SCPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method eliminates the need for references; however, it only allows a very approximate detection of defects

Method used

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  • Method for controlling the quality of laser-welding processes, control system and program product therefor
  • Method for controlling the quality of laser-welding processes, control system and program product therefor
  • Method for controlling the quality of laser-welding processes, control system and program product therefor

Examples

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Embodiment Construction

[0025] Referring to Figure 1, numeral 1 indicates the overall system for controlling the quality of the laser welding process. This example concerns the case of two metal sheets 2 , 3 which are welded using a laser beam L . Reference numeral 4 designates the entire focusing head, including a lens 5 to which a laser beam L generated by a laser generator (not shown) and reflected by a half-silvered mirror 6 reaches. The radiation E emitted by the welding area passes through the half-silvered mirror 6 and is picked up by the first sensor 7, which, as can be seen from the enlarged detail shown in FIG. Associated to the focusing lens 72 and to the filter 73, preferably an interference filter operating in the visible range between 300 and 600 nm and capable of sending its output signal corresponding to a signal indicative of the process radiation E*, i.e. This signal contains the spectral characteristics and time characteristics of the radiation reflected at the welding point, and ...

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Abstract

Described herein is a method for controlling the quality of a laser-welding process, for example of laser welds of semifinished products constituted by elements of sheet metal of different thickness and / or properties ('tailored blanks'), of the type that comprises the steps of : detecting a radiation (E*) produced in the welding area (2, 3) and issuing signals (E*) indicating said radiation; acquiring and processing said signals (E*) indicating said radiation; making a division into blocks of said signals (E*) indicating said radiation; calculating (205) for each block a block-mean value (u) and a value of block standard deviation (o) ; and in supplying input values comprising block-mean values (u) and values standard deviation (o) for indentifying defects and / or porosities and insufficient penetration.

Description

technical field [0001] The invention relates to a method for controlling the quality of a laser welding process, which comprises the steps of: [0002] detecting radiation generated in the weld zone and emitting a signal indicative of said radiation; [0003] acquiring and processing said signal indicative of said radiation; [0004] dividing the signal indicative of the radiation into blocks; [0005] calculating a block mean value for each block and comparing each said block mean value with a value that is a function of the mean value of the obtained signal indicative of radiation, and based on said comparison operation, confirming the value for the mean value block properties; and [0006] A block standard deviation value is calculated for each block and each of said block standard deviation values ​​is compared to a numerical value that is a function of a reference standard deviation, and based on said comparison, a block characteristic for the standard deviation is ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/03
CPCB23K26/032B23K26/0665
Inventor G·德安格洛G·帕斯奎塔茨
Owner CENT RICERCHE FIAT SCPA