磁粉探傷機是在磁粉檢測中使用的檢測設(shè)備，按其形式可分為便攜式磁粉探傷機、移動式磁粉探傷機和固定式磁粉探傷機。那么該如何選擇磁粉探傷機呢？
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我們先看一下磁粉探傷機使用的行業(yè)
產(chǎn)品類別 | 使用行業(yè) |
磁軛 | 壓力容器,造船,造紙機械的加工等 |
半波整流 | 特鋼,鑄鐵,機械制造,重型機器等 |
交直流兩用 | 汽車,軸承,熱處理加工,機械制造和加工,柴油機,機務行業(yè) |
非標專用 | 航空航天,合資汽車行業(yè),冶金,大型企業(yè) |
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選擇磁粉探傷機時，要從以下幾個方面考慮
設(shè)備使用環(huán)境
不同的場合使用不同形式的磁粉探傷機
a)如果是在固定場所探傷，應以固定式磁粉探傷機為主；
b)若檢測的工件品種單一，檢查數(shù)量較大，優(yōu)先采用專用檢測設(shè)備，或者將磁粉檢測的磁化與退磁功能分別設(shè)置以提高檢查速度；
c)實驗室用磁粉探傷機，應考慮功能較為齊全的固定式磁粉探傷機；
d)室外進行磁粉探傷時，應選擇移動式、便攜式或者攜帶充電電源的探傷機進行探傷。
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被檢工件情況
根據(jù)被檢工件的情況選擇磁粉探傷機
a)若被檢件體積和重量不大，易于搬動，或形狀復雜且數(shù)量多，則應選擇具有合適磁化電流并且功能較全的固定式磁粉探傷機；
b)若被檢工件的外形尺寸較大，重量也較重而又不能搬動，應選擇移動式或便攜式探傷機進行分段局部磁化；
c)若被檢表面黑暗或要求高，最好采用熒光磁粉探傷機
也可以采用與工件顏色反差較大的其他磁粉，或者使用反差增強劑以增加缺陷與底色誤差
其實，選擇的方法不難，只需要把握住幾個關(guān)鍵點：探傷工件的形狀、尺寸、現(xiàn)場條件、工件的數(shù)量、工件表面等情況，綜合考慮這些因素，就能夠選到合適的磁粉探傷機了。
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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