Metallographic detection method for resistance spot welding nugget diameter measurement
A nugget diameter and metallographic detection technology, which is applied in measuring devices, instruments, and material analysis through optical means, can solve problems such as measurement failure, detection result correction, and easy deviation
Active Publication Date: 2020-06-16
BENGANG STEEL PLATES
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Problems solved by technology
The measurement of resistance spot welding is a destructive experiment, so the cutting of the solder joints is very important, but during the cutting process, it is easy to deviate from the part that needs to be cut, so that the detected part cannot completely match the required part, resulting in The misalignment of the detection part, and once the cutting part deviates from the part that needs to be detected will cause the entire measurement to fail
When the problem of deviation from the measurement line occurs, there is currently no relevant method to correct the detection results
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[0018] figure 1 It is a schematic diagram of spot welding work, the power supply 10 supplies power to the electrodes 20, and the two parts 40 to be welded are welded together by pressing down the upper and lower electrodes 20 . Such as figure 2 As shown, from the point of view of the distribution characteristics of spot welding spot welding, it can be approximated as three concentric circles, the outermost layer is the black surface oxide layer zone 1; the middle is the area where the resistance solder joints are thinned and transitioned under the pressure of the electrode head , that is, the indentation area 2; high temperature is generated between the steel plates, which melts the core of the steel plate, and forms an approximately circular nugget 3 after cooling. Under the tip pressure of the electrode 20 , an oxide layer area 1 and an indentation area 2 are formed on the outer surface of the workpiece 40 to be welded, and the nugget 3 is located between the two workpiece...
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The metallographic detection method for resistance spot welding nugget diameter measurement comprises the following steps that: 1, a resistance spot welding part is selected, one surface of a weldingspot is selected, and the average value L1 of the diameter of an indentation area of the welding spot is calculated; 2, a cutting line which passes through the center of the welding spot and has the length of L1 is selected, and the welding spot is cut along the cutting line by using a cutting machine; 3, grinding, rough grinding, fine grinding, polishing and corrosion treatment are conducted on the cutting surface of the welding spot; 4, the cutting surface of the welding spot is measured under a microscope to obtain the measurement length L2 of the diameter of the indentation area and the measurement length d2 of the diameter of the nugget; 5, whether the error between L1 and L2 is smaller than an error threshold value or not is judged, if so, d2 is determined as the length of the nuggetarea, and otherwise, the step 6 is executed; and 6, the nugget diameter length d1 is calculated according to a designed formula.
Description
technical field [0001] The invention belongs to the technical field of resistance spot welding, and relates to a metallographic detection method for measuring the diameter of a nugget in resistance spot welding. Background technique [0002] Resistance spot welding is widely used in the automotive field or other processes that require spot welding for connection. In the inspection of the quality of solder joints under the welding process, one of the inspection contents is the measurement of the diameter of the nugget, which requires cutting of the solder joints. , and then grind, polish and corrode the section of the solder joint, and finally measure the diameter of the weld nugget under an optical microscope. The measurement of resistance spot welding is a destructive experiment, so the cutting of the solder joints is very important, but during the cutting process, it is easy to deviate from the part that needs to be cut, so that the detected part cannot completely match th...
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Login to View More IPC IPC(8): G01B11/08G01N21/84
CPCG01B11/08G01N21/84
Inventor 苏崇涛郭晓静左海霞海超于健孙健何群才赵广东田玉伟王亚芬王亚东王立刚
Owner BENGANG STEEL PLATES