Rapid and high-precision evaluation method for the amount of metal spatter in resistance spot welding
A resistance spot welding and metal quantity technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of low cost and low accuracy of spatter degree evaluation, and achieve the effect of high evaluation accuracy and optimization of spot welding process parameters.
Active Publication Date: 2021-07-13
SHANGHAI JIAOTONG UNIV +1
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[0003] Aiming at the low accuracy of evaluation of the degree of spatter existing in the prior art, the present invention proposes a fast and high-precision evaluation method for the amount of spattered metal in resistance spot welding, which is simple in operation, high in precision and low in cost, and can be applied to welding production lines
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[0017] Such as figure 1 As shown, the workpiece 1 to be welded in this embodiment is 0.8mm DP590 steel plate + 0.8mm DP590 steel plate, the welding current is 8-12kA, the welding pressure is 2.6kN, and the welding time is 200-300ms. Quantitative evaluation of the degree of welding spatter.
[0018] Step 1) Use an electronic balance with a resolution of 1 mg to weigh the workpiece 1 to be welded, and obtain the initial weight M of the workpiece 1 to be welded 0 .
[0019] Step 2) welding the workpiece 1 to be welded to form a spot welding joint, such as figure 2 shown.
[0020] Step 3) Use a spiral micrometer with a resolution of 1 μm to measure the total thickness h of the welded workpiece 1 1 , and then measure the thickness h of the surface depression of the spot welding joint to obtain the depth H of the surface indentation 3 of the spot welding joint = h 1 -h.
[0021] Step 4) Use needle-nose pliers, wire pliers, pliers or tensile testing machine to tear the spot we...
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A fast and high-precision evaluation method for the amount of spattered metal in resistance spot welding. Multiple sets of spot welding joint surface indentation depth data and spattered metal weight data are obtained by conducting multiple sets of welding tests, and the correlation mathematics between surface indentation depth and spattered metal weight is established. During production, by measuring the surface indentation depth and substituting it into the model to calculate the spattered metal weight of the new solder joints, to achieve rapid and high-precision evaluation of the amount of spattered metal. The present invention has high evaluation accuracy; it does not need to install other auxiliary equipment, is easy to operate and has low cost, and can be applied in the actual welding production line; the evaluation of the amount of spattered metal realizes the high-precision quantitative analysis of the degree of spattering, and provides a high-precision quantitative analysis for subsequent spattering control. It provides a reference basis, which in turn helps to optimize the spot welding process parameters.
Description
technical field [0001] The invention relates to a technology in the field of welding, in particular to a fast and high-precision evaluation method for the spattered metal amount of resistance spot welding. Background technique [0002] The resistance spot welding process has completed more than 90% of the welding work of the all-steel body. When abnormal welding conditions such as the distance between the welding spot and the edge of the workpiece are too small, or the gap between the workpieces is too large, spot welding spatter is easily generated. On the automobile body-in-white welding production line, the probability of spatter at some stations is as high as 80%. Splash affects the surface quality and positioning accuracy of the car body. As the degree of spatter increases, the indentation of solder joints will deepen, and it will also affect the surface quality of spot welding joints. In addition, too deep indentation will cause warping and deformation of the workpie...
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IPC IPC(8): G01N33/207
Inventor 夏裕俊练朝春周江奇苏泽炜楼铭李永兵
Owner SHANGHAI JIAOTONG UNIV