涡流检测技术
MAC® 的涡流检测 (ECT) 系统包含基于计算机的检测仪器以及两种 ECT技术的检测探头:穿过式和扇形探头,旋转式探头。

涡流检测技术
MAC® 的涡流检测 (ECT) 系统包含基于计算机的检测仪器以及两种 ECT技术的检测探头:穿过式和扇形探头,旋转式探头。

旋转探头式涡流检测是这样运行的:
- 被检产品纵向通过旋转探头,形成螺旋式扫查轨迹。
- 当探头扫查到缺陷时,会检测到感应涡流的变化。
- 可以被一致地检测到的最小缺陷长度是探头旋转速度以及材料通过速度的函数。
- 旋转检测可用于检测磁性和非磁性线材或棒材表面裂缝类缺陷。
旋转探头式涡流检测是这样运行的:
- 被检产品纵向通过旋转探头,形成螺旋式扫查轨迹。
- 当探头扫查到缺陷时,会检测到感应涡流的变化。
- 可以被一致地检测到的最小缺陷长度是探头旋转速度以及材料通过速度的函数。
- 旋转检测可用于检测磁性和非磁性线材或棒材表面裂缝类缺陷。
穿过式或扇形涡流探头的典型应用包括:
- 在线或离线检测磁性和非磁性线材、棒材或管材表面或一些近表面短小缺陷。
- 检测焊管焊区或整个圆周范围内的内表面或外表面短小缺陷。
- 检测其他截面一致的材料,如截面为正方形、矩形、六边形或圆形的材料。
- 检测小直径线材或管材的短小缺陷。
- 检测单股或多股绝缘电线和电缆的焊点和断点。
- 当检测碳钢、奥氏体不锈钢及其他磁导率大于1的合金钢时,通常需要使用磁场对被检产品施加磁饱和。否则磁导率会影响涡流探伤的效果。磁饱和线圈用于对涡流探头区域提供饱和磁场。

旋转探头式涡流检测的典型应用包括:
- 检测冷拔线材或定尺棒材表面裂缝类的缺陷。
- 在线检测连续线材的运行,如线材拉丝、零件成型、再绕、矫直和切断等。
- 检测定尺长度的材料,通常为离线检测。
- 检测零件,如小轴、轴承、活塞销上的纵向表面缺陷。
- 涡流技术可用于检测铁磁性和非磁性材料。
相关资源
The new high-speed Rotomac® eddy current tester for small diameter wire and rod from Magnetic Analysis Corp. (MAC) received strong interest from wire 2016 attendees.
The high-speed Rotomac® rotary eddy current tester for small diameter wire and rod is available from Magnetic Analysis Corp., Elmsford, NY, USA. The Rotomac eddy current tester is designed for ease of use and superior performance in detecting longitudinal, seam-type defects in small diameter wire and bar from 2 to 20 mm diameter.
Magnetic Analysis Corp. (MAC) has supplied an ultrasonic/eddy current multi-test system to inspect cold-drawn welded tube used in the production of shock absorbers at a Monterrey, Mexico plant operated by Prosankin (formerly A-4C-Sankin).
Magnetic Analysis Corp. has just delivered a single channel Multimac eddy current off-line test system designed to meet ASTM 999 (American Society for Testing Materials) specifications for testing welded stainless steel pipe.
Magnetic Analysis Corp.’s new 40mm Rotomac® Eddy Current Rotary offers enhanced convenience for detecting seam-type surface defects in cold-drawn wire, cut-length bar stock, and parts forming. A single-handle external probe adjustment allows quick, safe dimensional changes without opening the rotary.
Since the development of eddy current testing in the early to mid-1900s this method has been used to detect defects and properties of many types of metals. The most common applications are testing tubular products for transverse defects, testing bar or wire products for longitudinal surface defects, and testing parts for defects and properties such as hardness.
















