B-type DC ring 12-hole standard test block
(Comply with the standard requirements stipulated by ASME)
B-type DC standard ring test block (also known as 12-hole test block) or DC standard ring test block, the DC standard ring test block is called the BETZ ring in the United States with the same effect, made of AISI01 Ketos chrome tungsten manganese tool steel , Rockwell hardness HRC = 90 ～ 95, 12 through holes with a diameter of 0.07 inches are drilled on the ring, and the central hole diameter is 31.8mm. It is suitable for testing the comprehensive performance (system sensitivity) of magnetic powder and magnetic suspension of magnetic particle inspection equipment, and used to check whether the test conditions and operation methods are appropriate. However, the magnetization specification, magnetic field direction, and effective magnetization range cannot be determined.
The diameter of the hole and the size of the hole center from the outer edge:
hole
1
2
3
4
5
6
7
8
9
10
11
12
Diameter (inches)
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
Distance between hole and outer edge (inch)
0.07
0.14
0.21
0.28
0.35
0.42
0.49
0.56
0.63
0.70
0.77
0.84
Instructions:
A copper rod is used as the central conductor, magnetized by the penetrating rod method, passing a direct current, and tested by a continuous method, and observing the number of holes clearly displayed on the outer edge of the test block. This test block is only suitable for direct current or rectification electromagnetic
Precautions:
1. Before using the test block, gently wipe off the oil stain on the surface of the test block with soft paper or gauze, and then use a copper rod with a diameter of less than 31mm to penetrate into the center hole, and connect DC or rectified power at both ends of the copper rod magnetization.
2. Please apply anti-rust oil after using the test block.
Standard ring test block:
hole
1
2
3
4
5
6
7
8
9
10
11
12
diameter
1.8
D
1.8
3.6
5.4
7.2
9
10.8
12.6
14.4
16.2
18
19.8
21.6
Instructions:
Put the standard ring-shaped test block on the copper rod to magnetize it, pour magnetic suspension or spray magnetic powder, observe the magnetic marks on the edge of the perimeter of the garden and see the numbers in Table 1 and Table 2. If the specified value in the table is not reached, the system (magnetic powder, equipment, method, etc.) used should be checked and corrected.
Table 1: Magnetic marks of wet magnetic powder standard ring test block
Types of magnetic suspension
Ampere of magnetizing current
The minimum number of near-surface holes is shown
Fluorescent magnetic powder or non-fluorescent magnetic powder
1400
3
2500
5
3400
6
Table 2: Magnetic trace display of dry magnetic powder ring test block
Ampere of magnetizing current
The minimum number of near-surface holes is shown
500
4
900
4
1400
4
2500
6
3400
7
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