焊接表面的测量/检查

接触式表面检查

磁粒子试验（MT）

This method is suitable for detection of flaws on and near the surface of strongly magnetic materials such as iron and steel. When a weld workpiece is magnetized, a discontinuity occurs in the magnetized area where a flaw exists on the surface or in the shallow subsurface (within approx. 2 to 3 mm of the surface). The magnetic flux leaks from the part and causes magnetic poles along the border of the discontinuity. When magnetic particles are applied to the surface of the weld in this state, they turn into tiny magnets and are attracted to the magnetic poles around the flaw. The particles form a magnetic particle pattern showing a line several to several ten times thicker than the width of the actual flaw, which allows visual observation of the flaw.

渗透性测试（PT）

This method can be used for the surface inspection of almost all materials. Highly penetrative liquid of visible colors or gloss (penetrant) is applied to the surface of a weld. After the liquid penetrates into flaws, a developer is applied to draw the liquid out and enlarge the flaw, which allows visual observation.

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Conventional non-contact-type surface inspection

这surface inspection was done visually by experienced welding workers. Such visual inspection has various problems, including the need for a lot of man-hours, the difficulty of securing workers with enough skills and experience, and the possibility of human errors such as overlooking defects.

使用视觉系统允许内联检查提高效率。由于环境光围绕传感器或焊接的颜色不规则性的影响，问题是错误的检测。

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Non-contact-type surface inspection with a laser displacement sensor

这珠子shape is detected based on the reflection of the laser emitted to the weld surface.
Laser displacement sensors generally require an optimum amount of reflected light to ensure stable shape detection. Conventional typical laser displacement sensors adjust the amount of light for a target based on the intensity of the received light reflected from the entire surface of the target. Consequently, they had problems with erroneous detection caused by the difference in the reflected light when measuring curved surfaces and surface with different colors.

LJ-X8000系列高速2 d / 3 d激光扫描仪detects the shape of the bead by emitting a line laser from the sensor head and using the light-section method that measures the cross-sectional shape based on the reflected light. Its light receiving element with a dynamic range 2400 times wider than conventional models enables accurate profile recognition even when the target weld has a curved surface, gloss, or color irregularities.
这compact sensor head capable of high-speed sampling is suitable for inline measurement.

光段方法的检测机制

激光通过圆柱形透镜涂布到宽的光束中，并漫射在目标的表面上。这种反射的光聚焦在HSE上的图像中^3.-CMOS，提供高灵敏度和宽动态范围。该图像用于检测位置和轮廓的变化并测量位移或形状。

1. 半导体激光器
2. Cylindrical lens
3. 2D Ernostar lens
4. HSE.^3.-CMOS
5. GP64-Processor

宽动态范围可确保稳定检测

传统的位移传感器需要在反射光波动时调节激光功率或曝光时间。LJ-X8000系列具有宽的动态范围，以允许准确的简档识别而不会受到由测量表面的倾斜度或光泽引起的反射光强度的差异的影响。

Profile detection with the LJ-X

简介数据不受亮度差异的影响

蓝色激光不受热目标的影响

典型的红色激光位移传感器在其接收器前面的带通滤波器仅通过大约650nm的灯光。当目标是炽热钢板时，辐射光的波长部件主要在红色和红外线之间。这意味着检测受环境光极大的影响。
这lj-x8000Series has adopted a blue laser and is equipped with a band-pass filter that passes light of around 405 nm only. This allows measurement of even hot targets immediately after welding without being affected by wavelength components between red and infrared.

1. Reflected blue laser light
2. 来自热目标的辐射光
   （包括红色和红外线之间的许多波长分量）
3. Band-pass filter passing light of around 405 nm only
   （防止波长分量在红色和红外线之间的影响）

与传统的相机或典型的激光置换传感器不同，LJ-X8000系列达到稳定的轮廓检测，而不受火花或在焊接后立即从热红色钢板的辐射光线产生的火花或其他光学噪声的影响。
这使得例如通过在焊接过程中跟踪焊炬之后立即立即高速检查珠子形状的高速检查tailored blanks (TBs)。

珠子形状检测在量身定制的空白焊接中的比较

A.传统的相机

由于诸如靶的颜色不规则性和光泽度等不稳定的表面条件，测量难以。

B.激光位移传感器（LJ-X8000系列）+图像处理

珠子形状可以稳定地测量而不会受到靶的表面状况的影响。

以这种方式，LJ-X8000系列允许非接触式焊珠的完整形状测量。这可以应用于：

1. 2D形状检验有缺陷的焊珠（如底切那overlap那强化不足， 要么开裂的）
2. 3D形状检查使用连续横截面形状数据的图像处理和分析，实现进一步详细的检查，例如查找分钟surface defects。

使用LJ-X8000系列的2D / 3D形状检查的示例

• 检查产品详情the LJ-X8000 Series
• 目录下载