Method for detecting geometric shape of back of tailor-welding weld and implementing device thereof

Abstract

The invention relates to a method for detecting the geometric shape of the back of a tailor-welding weld and an implementing device thereof. The method comprises the following steps that: a linear laser is used for projecting laser on the back of a tailor-welding weld so as to generate a plurality of laser streaks on the surface of the tailor-welding weld; a sensing unit acquires and obtains a weld surface gray level image including the laser streaks and transmits the acquired image to an image processing unit; the image processing unit processes the acquired weld image to obtain all shape parameters; and the weld quality is judged and thus the detection on the geometric shape of the back of the weld is finished. The implementing device of the method comprises a sensing unit, an image processing unit and a parameter setting and control unit, wherein the sensing unit is used for acquiring the image of a tailor-welding weld and transmitting the image to the image processing unit, the image processing unit is used for processing the acquired weld image, the parameter setting and control unit is used for setting all parameters and is respectively in communication with the sensing unit, the image processing unit and an upper computer. According to the invention, detection error caused by interference factors such as dust on the back of the weld, welding splatter, board scratch and the like in the welding process can be avoided, and the detection accuracy is improved greatly.

Description

technical field

[0001] The invention relates to the technical field of automatic detection of welding quality, in particular to a method for detecting the geometric appearance of the back side of a laser tailor welding seam and a device for realizing it. Background technique

[0002] Due to its high efficiency, high speed, high precision and strong adaptability, laser tailor welding technology has been widely used in automobile manufacturing, metallurgy and other industries. Tailored welded blanks have very strict requirements on the quality of welds, especially the geometric parameters such as the weld width on the back of the weld, which are important indicators to measure the quality of the weld. However, due to the fast welding speed of laser tailor welding, and the different On the front side of the weld, smoke and dust will be absorbed during the welding process, making it very difficult to detect the appearance of the back of the laser tailor welded seam online. [0...

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