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Aluminum alloy car body coloring pervasion weld seam leakage testing technological process

An aluminum alloy car body, coloring penetration technology, applied in the direction of optical testing flaws/defects, detecting the appearance of fluid at leak points, using liquid/vacuum for liquid tightness measurement, etc., can solve problems such as ponding water pollution, Achieve the effects of ensuring surface quality, avoiding rainwater leakage, and facilitating observation

Inactive Publication Date: 2008-11-12
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the rain test is usually used for the leak test of aluminum alloy car body roof welds, but if there is no drainage equipment in the workshop, the accumulated water will cause serious pollution. Therefore, it is urgent to research and develop a coloring penetration weld leak test suitable for the workshop without drainage equipment craft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Eliminate the scale, rust, dust and related factors that affect the flaw detection of the weld to be detected; clean the oily deposits on the weld to be detected with a cleaning agent, and wipe it clean with a clean cloth or cotton gauze; Spray the penetrating agent evenly on the outside to ensure that it is not dry for 10 minutes, and spray it every 2 minutes; observe whether there is leakage on the other side of the weld. If there is leakage, the weld must be repaired to prevent the roof weld The role of rain leakage; after the weld leak test, carry out weld penetration flaw detection, the surface temperature of the detected part should not be higher than 70 ℃, observe whether there are defects in the roof welds, and determine whether the marks are real defects or false defects. Defects are rated against criteria to determine whether to fix them.

Embodiment 2

[0015] Eliminate the scale, rust, dust and related factors that affect the flaw detection of the weld to be detected; clean the oily deposits on the weld to be detected with a cleaning agent, and wipe it clean with a clean cloth or cotton gauze; Spray the penetrant evenly on the outside to ensure that it is not dry for 15 minutes, and spray it every 3 minutes; observe whether there is leakage on the other side of the weld. If there is leakage, the weld must be repaired to prevent the roof weld The role of rain leakage; after the weld leak test, carry out weld penetration flaw detection, the surface temperature of the detected part should not be higher than 70 ℃, observe whether there are defects in the roof welds, and determine whether the marks are real defects or false defects. Defects are rated against criteria to determine whether to fix them.

Embodiment 3

[0017] Eliminate the scale, rust, dust and related factors that affect the flaw detection of the weld to be detected; clean the oily deposits on the weld to be detected with a cleaning agent, and wipe it clean with a clean cloth or cotton gauze; Spray the penetrant evenly on the outside to ensure that it is not dry for 12.5 minutes, and spray it every 2.5 minutes; observe whether there is leakage on the other side of the weld. If there is leakage, the weld must be repaired to prevent the roof The role of weld leakage; after the weld leak test, conduct weld penetration flaw detection, the surface temperature of the detected part should not be higher than 70 ℃, observe whether there are defects in the roof weld, and determine whether the trace is a real defect or a false defect are displayed, and defects are rated against criteria for patching.

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PUM

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Abstract

The present invention provides a dye penetration welding line leakage test process for an aluminium alloy car body, comprising the steps of eliminating all of the oxide scale, pocking and dust on the welding line to be tested; washing the oil contamination off the welding line to be tested and cleaning the welding line by a piece of clean cloth or cotton yarn; spraying and coating osmotic agent evenly on the outside of the welding line to be tested every 2 to 3 minutes, making sure that the welding line is wet within 10 to 15 minutes; observing whether leakage exists on the other side of the welding line or not and mending the welding line if leakage exists. Therefore, the probability that the welding line on the car top leaks can be avoided by using the process with high technique sensitivity and reliability surpassing the rain test in the present invention, and the probability of accumulated water pollution caused by the rain test in workshop can also avoided. Furthermore, the quality of the welding line surface on the car top can be ensured through fault detection because the process can be performed easily without any other devices and the result is easy to observe. General process workers can perform the dye penetration welding line leakage test process after a simple training, thus, professional fault detection workers are not necessary.

Description

technical field [0001] The invention relates to a liquid penetrating detection technology, in particular to a leak testing method for colored penetration welds of an aluminum alloy vehicle body. Background technique [0002] Leakage testing (leak detection) is a non-destructive testing technique that detects the leakage of liquid or gas from a pressure vessel or the infiltration from the outside. With the modernization of industry and the development of science and technology, leak detection is becoming more and more important. At the same time, the liquid penetrant testing method is also a non-destructive testing method for inspecting the surface opening defects of aluminum alloy welds. The penetrant is applied to the surface of aluminum alloy welds. The penetrant can penetrate into the opening defects on the weld surface due to capillary action, and the penetration After the developer has dried and the developer has been applied, visual inspection will reveal defects on t...

Claims

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Application Information

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IPC IPC(8): G01M3/04G01N21/91
Inventor 田勐
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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