磁粉探伤机是在磁粉检测中使用的检测设备，按其形式可分为便携式磁粉探伤机、移动式磁粉探伤机和固定式磁粉探伤机。那么该如何选择磁粉探伤机呢？
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我们先看一下磁粉探伤机使用的行业
产品类别 | 使用行业 |
磁轭 | 压力容器,造船,造纸机械的加工等 |
半波整流 | 特钢,铸铁,机械制造,重型机器等 |
交直流两用 | 汽车,轴承,热处理加工,机械制造和加工,柴油机,机务行业 |
非标专用 | 航空航天,合资汽车行业,冶金,大型企业 |
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选择磁粉探伤机时，要从以下几个方面考虑
设备使用环境
不同的场合使用不同形式的磁粉探伤机
a)如果是在固定场所探伤，应以固定式磁粉探伤机为主；
b)若检测的工件品种单一，检查数量较大，优先采用专用检测设备，或者将磁粉检测的磁化与退磁功能分别设置以提高检查速度；
c)实验室用磁粉探伤机，应考虑功能较为齐全的固定式磁粉探伤机；
d)室外进行磁粉探伤时，应选择移动式、便携式或者携带充电电源的探伤机进行探伤。
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被检工件情况
根据被检工件的情况选择磁粉探伤机
a)若被检件体积和重量不大，易于搬动，或形状复杂且数量多，则应选择具有合适磁化电流并且功能较全的固定式磁粉探伤机；
b)若被检工件的外形尺寸较大，重量也较重而又不能搬动，应选择移动式或便携式探伤机进行分段局部磁化；
c)若被检表面黑暗或要求高，最好采用荧光磁粉探伤机
也可以采用与工件颜色反差较大的其他磁粉，或者使用反差增强剂以增加缺陷与底色误差
其实，选择的方法不难，只需要把握住几个关键点：探伤工件的形状、尺寸、现场条件、工件的数量、工件表面等情况，综合考虑这些因素，就能够选到合适的磁粉探伤机了。
Magnetic particle testing machine is used in magnetic particle testing testing equipment, according to its form can be divided into portable magnetic particle testing machine, mobile magnetic particle testing machine and fixed magnetic particle testing machine. So how to choose magnetic particle inspection machine?
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Let's take a look at the industry used by magnetic particle inspection machine
Product category
Using industry
yoke
Pressure vessels, shipbuilding, paper machinery processing, etc
Half-wave rectifier
Special steel, cast iron, machinery manufacturing, heavy machinery, etc
Ac/DC dual use
Automotive, bearings, heat treatment processing, machinery manufacturing and processing, diesel engines, machinery industry
Non-standard special
Aerospace, joint venture automobile industry, metallurgy, large enterprises
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The following aspects should be considered in selecting magnetic particle inspection machine
Device Operating environment
Different occasions use different forms of magnetic particle inspection machine
A) If the flaw detection is in a fixed place, the fixed magnetic particle flaw detection machine should be the main;
Fixed magnetic particle flaw detector
B) If the type of workpiece is single and the number of inspection is large, special detection equipment shall be preferred, or the magnetization and demagnetization functions of magnetic particle detection shall be set separately to improve the inspection speed;
Fluorescent magnetic powder detection line for steel cylinder
Demagnetization machine
C) Magnetic particle inspection machine for laboratory use, fixed magnetic particle inspection machine with relatively complete functions should be considered;
D) When conducting magnetic particle inspection outdoors, mobile, portable or rechargeable flaw detector shall be selected for inspection.
Mobile magnetic particle flaw detector
Portable magnetic particle flaw detector
Portable power type magnetic particle flaw detector
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The condition of the workpiece being inspected
Choose magnetic particle flaw detector according to the condition of the workpiece being inspected
A) If the volume and weight of the inspected parts are not large, easy to move, or the shape is complex and the number is large, the fixed magnetic particle flaw detector with appropriate magnetization current and full function should be selected;
B) If the workpiece inspected is of large size and heavy weight and cannot be moved, mobile or portable flaw detection machine should be selected for partial magnetization;
C) If the tested surface is dark or has high requirements, it is best to use fluorescent magnetic particle inspection machine
Fluorescent magnetic particle flaw detector
You can also use other magnetic powder with large color contrast with the workpiece, or use contrast enhancer to increase defects and background color error
Contrast intensifier
In fact, the selection method is not difficult, just need to grasp a few key points: the shape, size, field conditions, the number of workpiece, workpiece surface, etc., comprehensive consideration of these factors, can choose the right magnetic particle inspection machine.
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