Prediction method of nugget diameter in resistance spot welding

A nugget diameter and resistance spot welding technology, applied in resistance welding equipment, welding equipment, welding power sources, etc., can solve problems such as poor practicability, reduce force imbalance, quickly predict nugget diameter online, and reduce real-time calculation. amount of effect

Active Publication Date: 2019-10-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing resistance spot welding nugget diameter prediction method, the present invention provides a resistance spot welding nugget diameter prediction method

Method used

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  • Prediction method of nugget diameter in resistance spot welding
  • Prediction method of nugget diameter in resistance spot welding
  • Prediction method of nugget diameter in resistance spot welding

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1. Prediction of nugget diameter in spot welding of 30CrMnSi structural steel.

[0020] 1. Use NA-200-4 single-phase AC spot welding machine.

[0021] 2. The 30CrMnSi structural steel specimen (100mm×20mm×1.2mm; 100mm×20mm×1.5mm) was polished with gauze paper for surface cleaning.

[0022] 3. Carry out three-point continuous lap spot welding of two-layer boards according to the parameters in Table 1, and the spot welding distance is 35mm. Collect welding current and electrode pressure signals during welding.

[0023] 4. Select the point on the electrode pressure curve corresponding to the start of the welding process as the starting point, and the peak pressure as the ending point, and calculate the slope S of the pressure curve between the starting point and the ending point after a one-dimensional linear fitting.

[0024] 5. Substitute the obtained slope S into D=0.149S+2.732 to obtain the predicted value D of the nugget diameter.

[0025] 6. The diameter o...

Embodiment 2

[0029] Example 2. 1Cr18Ni9Ti stainless steel spot welding nugget diameter prediction.

[0030] 1. Use NA-200-4 single-phase AC spot welding machine.

[0031] 2. Use cotton yarn to remove surface oil stains on the 1Cr18Ni9Ti stainless steel specimen (100mm×20mm×1.0mm).

[0032] 3. Carry out three-point continuous lap spot welding of two-layer boards according to the parameters in Table 2, and the spot welding distance is 35mm. Collect welding current and electrode pressure signals during welding.

[0033] 4. Select the point on the electrode pressure curve corresponding to the start of the welding process as the starting point, and the peak pressure as the ending point, and calculate the slope S of the pressure curve between the starting point and the ending point after a one-dimensional linear fitting.

[0034] 5. Substitute the obtained slope S into D=0.149S+2.732 to obtain the predicted value D of the nugget diameter.

[0035] 6. The diameter of the nugget is measured thr...

Embodiment 3

[0039] Example 3. Q235 low carbon steel spot welding nugget diameter prediction.

[0040] 1. Use NA-200-4 single-phase AC spot welding machine.

[0041] 2. Grind the Q235 low carbon steel specimen (100mm×20mm×1.0mm) with gauze paper for surface cleaning.

[0042] 3. Carry out three-point continuous lap spot welding of two-layer plates according to the parameters in Table 3, and the spot welding distance is 35mm. Collect welding current and electrode pressure signals during welding.

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Abstract

The invention discloses a resistance spot welding nugget diameter predicting method to solve the technical problems that the practicality of an existing resistance spot welding nugget diameter predicting method is poor. According to the technical scheme, electrode pressure signals are acquired in real time, a unary linear regression equation between the nugget diameter and the electrode pressure change curve rising slope is established, and the real-time predicting of the nugget diameter is achieved. A pressure sensor arranged between a bottom electrode holding rod and a bottom electrode of aspot welding machine is used for acquiring the electrode pressure signals, the sensor installation position is close to a welded workpiece, the effects caused by imbalance of stress in the movement process are reduced, the actual change situation of electrode pressure in the welding process is precisely measured, and the smelting amount of metal is accurately reflected in real time. By means of the unary linear regression equation between the nugget diameter and the electrode pressure change curve rising slope, online and rapid nugget diameter prediction is achieved; and by means of the resistance spot welding nugget diameter predicting method, the nugget diameters of quenched steel, low-carbon steel, stainless steel, an aluminum alloy and other metal materials can be predicted, and the practicality is good.

Description

technical field [0001] The invention relates to a method for predicting the nugget diameter of resistance spot welding. Background technique [0002] The resistance spot welded joint strength mainly depends on the nugget diameter. Therefore, predicting the nugget diameter is beneficial to monitor the quality of spot welded joints. [0003] Document 1 "Study on the nugget growth in single-phase AC resistance spotwelding based on the calculation of dynamic resistance, Journal of Materials Processing Technology, Volume 229, 2016, pages 492-500" discloses a spot welding based on dynamic resistance theory Nugget diameter prediction method and prediction model. However, this method is limited to metal materials with significant dynamic resistance change characteristics represented by low carbon steel, and cannot predict the spot welding nugget diameter of materials without significant dynamic resistance change characteristics such as stainless steel and aluminum alloy. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/25B23K11/11
Inventor 张勇芦甜马铁军孔宁宁谢红霞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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