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Resistance spot-welding spatter online detection method and system based on intrinsic process signals

A process signal, resistance spot welding technology, applied in resistance welding equipment, welding power source, welding equipment and other directions, can solve problems such as affecting the surface quality and positioning accuracy of the body, affecting the mechanical properties of spot welding joints, and being unable to real-time online detection. The effect of fast calculation speed, good linear correlation, and improved detection efficiency

Active Publication Date: 2020-06-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Splash affects the surface quality and positioning accuracy of the car body, and even affects the mechanical properties of spot welding joints
The existing technology uses manual stripping to measure the quality difference before and after the splash to obtain the quality of the splashed metal, but this method has a large workload, low measurement accuracy and cannot be detected online in real time

Method used

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  • Resistance spot-welding spatter online detection method and system based on intrinsic process signals
  • Resistance spot-welding spatter online detection method and system based on intrinsic process signals
  • Resistance spot-welding spatter online detection method and system based on intrinsic process signals

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Embodiment 1

[0027] Such as figure 1 As shown, this embodiment relates to an on-line detection method for resistance spot welding spatter based on intrinsic process signals, which obtains the shape feature quantity of the electrode cap 1 by measuring, then performs welding and collects welding current and intrinsic process signals, and establishes the energization The relationship diagram of the intrinsic process signal changing with time in the welding stage, the relationship diagram is combined with the spatter criterion to judge the number of spatters, the characteristic quantity of each spatter is extracted and combined to obtain the cumulative characteristic quantity of the intrinsic process signal in the spattering process, through this The volume of the splashed metal is calculated by accumulating the characteristic quantity and the shape characteristic quantity of the electrode cap 1, and then the predicted value of the quantity of the splashed metal is obtained.

[0028] Such as ...

Embodiment 2

[0047] Such as figure 2 As shown in b, compared with the embodiment 1, the electrode cap 1 of the present embodiment is an arc-surface cone-top electrode, and the dynamic electrode pressure signal is preferably used as the intrinsic process signal, and the intrinsic process signal sensor 6 of the upper electrode is a load cell. The lower electrode intrinsic process signal sensor 7 is a surface strain sensor, the current sensor 5 is a Hall current sensor 5, and the calculation and analysis module 10 is a monitor.

[0048] Such as Figure 8 As shown, in this embodiment, the threshold A is set to 30N, and the start time and end time of splashing are judged according to the intersection of the dynamic electrode pressure differential signal and the threshold horizontal line, and the number of splashes is determined as one, and the splashing is marked as F 1 , the obtained cumulative feature quantity calculates the volume of spattered metal in the welding process Among them: K ...

Embodiment 3

[0051] Such as figure 2 As shown in c, compared with Example 1, the electrode cap 1 of this embodiment is a spherical electrode, and the bottom diameter D of the electrode cap 1 needs to be measured, and the expression for the volume of the splashed metal is: Among them: K 3 is the correction factor chosen according to the different intrinsic process signals.

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Abstract

The invention discloses a resistance spot-welding spatter online detection method based on intrinsic process signals. The method comprises the steps that intrinsic process signals and current signalsoutput by sensors arranged at two electrode caps are collected in real time in the welding process, a time-dependent relational graph is built, spatter judgement is performed according to the relational graph, the spatter frequency and the single-pass characteristic quantity are obtained, and the accumulation characteristic quantity in the spattering process is obtained by combining the spatter frequency and the single-pass characteristic quantity; according to the accumulation characteristic quantity and the morphology characteristic quantity of the electrode caps, the spatter metal volume iscalculated, and then a predicted value of the spatter metal volume is obtained. According to the resistance spot-welding intrinsic process signals, online prediction of the spatter metal quantity isperformed, online quantitative evaluation of the spot-welding spatter process is achieved, the defects caused when manual detection is relied on in the prior art are overcome, and the detection efficiency and precision are remarkably improved. Meanwhile, the influence of different electrode cap shapes is considered, the applicability is high, the good linear relevance is shown between the actual measured value and the predicted value of the spatter metal amount, and the detection precision is high. In addition, the spatter online detection method is high in calculation speed, low in requirement for a hardware system, and applicable to various resistance spot-welding application scenarios.

Description

technical field [0001] The invention relates to a technology in the field of welding, in particular to an on-line detection method and system for resistance spot welding spatter based on intrinsic process signals. Background technique [0002] The resistance spot welding process has completed more than 90% of the welding work of the all-steel body. Splash affects the surface quality and positioning accuracy of the car body, and even affects the mechanical properties of spot welded joints. The existing technology uses manual stripping to measure the quality difference before and after the splash to obtain the quality of the splashed metal, but this method has a large workload, low measurement accuracy and cannot be detected online in real time. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes an on-line detection method and system for resistance spot welding spatter based on intrinsic process sig...

Claims

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Application Information

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IPC IPC(8): B23K11/25B23K11/11
CPCB23K11/25B23K11/11G01N33/207B23K11/115B23K11/253B23K11/257B23K31/125
Inventor 夏裕俊沈衍李永兵雷海洋
Owner SHANGHAI JIAO TONG UNIV