1.1 本规程涵盖了铜和铝重新拉丝杆的电磁（涡流）检查中应遵循的程序，以检测可能导致失效或显著损害杆表面质量的严重不连续或缺陷。这些程序适用于直径为 1. / 4. 至1 3. / 8. 在里面（6.4至35 mm），适用于进一步制造成电导体。 1.2 这种做法包括用硬沥青或无氧铜制成的重划棒。它也可以用于其他类型的铜，如火精炼高导电棒。它也适用于用于电气目的的铝和其他有色金属合金。 1.3 本规程中描述的程序基于使用差动或绝对静止环形测试线圈系统的方法。 1.4 本惯例未建立验收标准。验收标准必须由使用方制定。 1.5 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 涡流检测仪为质量控制目的提供有关铜和铝棒可接受性的及时有用信息，并为生产不可接受棒提供预警。涡流检测是一种定位产品表面不连续性的无损方法。信号可以由杆表面的不连续性产生。由于涡流密度随着与表面的距离增加而几乎呈指数下降，因此可能无法检测到深层缺陷。 5.1.1 一种例外情况是，使用包裹在直流磁场中的额外或共享绕组检测地下铁磁性夹杂物，并添加适当的仪器。 线圈绕组作为传感器，在磁化夹杂物通过时产生电压，提供与表面缺陷涡流响应不同的电信号。棒对直流效应是透明的，允许在没有涡流噪声的情况下对铁磁夹杂物具有高灵敏度。该方法天生对速度敏感，但通过高通量速度得以增强，从而能够检测出对棒质量特别有害的微小地下铁磁性夹杂物。 5.2 通过本实践获得的一些指示可能与产品质量无关。例如，信号可能由微小缺陷或不规则、材料异常或其组合引起，这些缺陷或不规则对产品的最终用途无害。 被称为“噪声”的非相关显示可以掩盖不可接受的不连续性。另一方面，相关指示是指可能由不可接受的不连续性引起的指示，应由用户和供应商之间的协议确定。任何被认为不相关的迹象应被视为不可接受，直到通过复查或其他方式证明其不相关。

1.1 This practice covers the procedures that shall be followed in electromagnetic (eddy current) examination of copper and aluminum redraw rods for detecting discontinuities or imperfections of a severity likely to cause failure or markedly impair surface quality of the rod. These procedures are applicable for continuous lengths of redraw rod in diameters from 1 / 4 to 1 3 / 8 in. (6.4 to 35 mm) suitable for further fabrication into electrical conductors. 1.2 This practice covers redraw rod made from tough-pitch or oxygen-free coppers. It can also be used for other types of copper, such as fire-refined high conductivity rod. It is also appropriate for aluminum and other nonferrous alloys used for electrical purposes. 1.3 The procedures described in this practice are based on methods for making use of differential or absolute stationary encircling annular test coil systems. 1.4 This practice does not establish acceptance criteria. Acceptance criteria must be established by the using parties. 1.5 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Eddy current instrumentation provides timely and useful information regarding the acceptability of copper and aluminum rod for quality control purposes, as well as providing for early warning that unacceptable rod is being produced. Eddy current testing is a nondestructive method of locating surface discontinuities in a product. Signals can be produced by discontinuities located on the surface of the rod. Since the density of eddy currents decreases nearly exponentially as the distance from the surface increases, deep-seated defects may be undetected. 5.1.1 An exception is the detection of subsurface ferromagnetic inclusions with an additional, or shared, winding enveloped in a DC magnetic field and the addition of appropriate instrumentation. The coil winding, acting as a transducer, generates a voltage as the magnetized inclusion passes through, providing an electrical signal separate from the eddy current response to surface imperfections. The rod is transparent to the DC effect allowing high sensitivity to ferromagnetic inclusions, in the absence of eddy current noise. The method is inherently speed sensitive but is enhanced by high throughput speeds enabling the detection of small subsurface ferromagnetic inclusions which are particularly detrimental to rod quality. 5.2 Some indications obtained by this practice may not be relevant to product quality. For example, a signal may be caused by minute flaws or irregularities, by anomalies in the material, or a combination thereof, that are not detrimental to the end use of the product. Nonrelevant indications, referred to as “noise,” can mask unacceptable discontinuities. On the other hand, relevant indications are those that may result from unacceptable discontinuities and should be determined by agreement between the user and the supplier. Any indication that is believed to be irrelevant shall be regarded as unacceptable until it is demonstrated by reexamination or other means to be nonrelevant.