德国卡尔德意志Karl Deutsch荧光磁粉参考试块MTU-3磁化金属磁悬液灵敏度检测试块MTU Nr.3

（MTU-3,DIN EN ISO 9934-2）GB/T15822.2

说明：

参考块类型1（MTU Nr.3）

参考试块是一个有自然裂纹的环，并经过磁化处理。在试件的两个表面上，有不同宽度、长度和深度的裂纹。每个试件都有自己的裂纹结构。

不能将裂纹显示与其他试件进行比较。

磁场参考块在这些裂缝产生的杂散不同强度通量。更敏感检查媒体结果在一个更明显的迹象表明，相比迹象时低灵敏度。中间钻孔更容易处理。

使用方法：

参考块类型1根据标准EN ISO9934-2（前说明“MTU试块”）用于显示磁粉探伤灵敏度的检查和监督磁粉试剂。表面的剩余磁化参考块包含一个网络和粗细裂缝。与磁粉溶液浸泡或喷涂后，裂纹迹象评估。

应用范围：

参考块类型1浸泡或喷洒仔细检查介质混合。冗余检查介质应倒掉。然后裂纹迹象都被视为适当的照明条件下。然后，您应该检查的疲软迹象，因为这是在粒子敏感度的差异变得明显。

注意：

参考块类型1的裂纹迹象可能受到污染，强磁场或机械的影响。给予正确的适应症，参考块前应用的污垢，油，油脂和磁性粒子。因此，参考块，应清洗后，每个应用程序（用湿布擦拭）。参考块不应暴露在强磁场，如从MP裂纹探测器，磁化和消磁线圈，磁板，等，因为它们可能会影响到剩余场阻止通过改变磁场强度和方向。

Instructions:

Reference Block Type 1 （MTU Nr.3）

Description:

The reference block type 1 is a residually magnetized metal disc, where, caused by a special

treatment, a network of coarse and fine cracks had been generated. The magnetic field of the

reference block generates stray fluxes of different strength across these cracks. More sensitive

inspection media result in a more distinct indications as compared to the indications when lower

sensitivity is used. The central bore hole is made for easier handling.

Use:

The reference block type 1 according to EN ISO 9934-2 （former description "MTU test block"） is

used for checking and supervision of the indication sensitivity of magnetic particle crack detection

agents. The surface of the residually magnetized reference block contains a network of coarse and

fine cracks. After dipping or spraying with the magnetic particle solution, the crack indications are

evaluated.

Application:

The reference block type 1 is immersed or carefully sprayed with the well-mixed inspection medium.

Redundant inspection medium should be drained off. Then the crack indications are to be viewed

under appropriate lighting conditions. You should then inspect the weaker indications as this is

where differences in particle sensitivity becomes obvious.

Note:

The crack indication of the reference block type 1 may be affected by contamination, strong

magnetic fields, or mechanical influences. To give correct indications, the reference block should

be free of dirt, oil, grease and magnetic particles from former applications. Therefore, the reference

block should be cleaned after each application （wipe off with a wet cloth）. The reference block

should not be exposed to strong magnetic fields such as from MP crack detectors, magnetizing and

demagnetizing coils, magnetic holding plates, etc. as they may influence the residual field of the

block by altering the field strength and direction.