方管要樣兒（ér）進行裂縫的（de）開展檢測辦法，重點有這陣（zhèn）兒五絕：一電傅科電流開展檢測.電傅科電流開展檢測有多種不同的方式，合同的有成規傅科（kē）電流開（kāi）展檢測、遠場傅科電（diàn）流開展檢測、多頻傅科（kē）電流開展檢測和脈波傅科電（diàn）流開（kāi）展檢測等，使用電傅科電流傳感器對（duì）非金屬開展影（yǐng）響，方管要樣兒有（yǒu）所區別進（jìn）行裂（liè）縫種類和（hé）幾何形狀（zhuàng）將形成有所區別種類的手勢。其長處是開展（zhǎn）檢測精確程度高、檢測（cè）靈敏度高，開展（zhǎn）檢測（cè）運行速度快，能（néng）開展檢（jiǎn）測待開展檢測管材的要樣兒及亞要樣（yàng）兒，且不受待開展檢測方管要樣兒血汙等廢物的產生相應作用。毛（máo）病是易將非進行裂（liè）縫整體結構決定為進行裂（liè）縫，誤檢率較高，開（kāi）展檢測分離率使不得（dé）易作出調整。
There
are five main methods to detect the surface defects of square tubes: one is eddy
current testing. Eddy current testing has many forms, such as conventional eddy
current testing, far-field eddy current testing, multi-frequency eddy current
testing and pulse eddy current testing. Using eddy current sensors to induce
metal, different types and shapes of defects on square tubes surface will
produce different types of signals. It has the advantages of high detection
accuracy, high detection sensitivity, fast detection speed, can detect the
surface and sub-surface of the pipe to be tested, and is not affected by the
impurities such as oil contamination on the surface of the square pipe to be
tested. The disadvantage is that it is easy to judge the non-defective structure
as a defect, the false detection rate is high, and the detection resolution is
not easy to adjust. 二超聲波波（bō）開展檢（jiǎn）測
Two-Ultrasound Detection
使（shǐ）用超聲波波參加物（wù）質進行遭遇進行裂縫時，關於一部（bù）分超聲波會形成影響，進行展開和接受器可（kě）對影響波開展進行分析，就能不正常準確（què）地（dì）檢測進行裂縫來。超聲波波（bō）開展檢測合（hé）同於標準件開（kāi）展檢測，開（kāi）展檢測探（tàn）病靈敏度高，不過著名進行檢查幾何形狀較為複雜的管材，具體要求被（bèi）進行檢查的方管要樣兒有準譜兒重要度，並需有齧合劑填寫滿探（tàn）測器和被進行檢查要樣兒彼此之（zhī）間的閑暇。
When
ultrasound enters an object and encounters a defect, a part of the acoustic wave
will produce reflection. The transmitter and receiver can analyze the reflected
wave, and the defect can be detected abnormally and accurately. Ultrasound
detection is often used for forging detection, which has high detection
sensitivity, but it is not easy to inspect the pipe with complex shape. It
requires that the surface of the inspected square pipe should have a certain
degree of smoothness, and the coupling agent should be used to fill the gap
between the probe and the inspected surface.
三磁粉法開展檢測
Detection by three magnetic powder method
磁粉法開展檢測的規律是在方管材料中達成電磁（cí）場，依據進行裂縫處的漏電磁場與磁粉的相互之間實際作用，當要樣（yàng）兒和（hé）近要樣兒（ér）有不接連不斷持續或缺陷時，則在（zài）不接連不斷處持續或缺陷處（chù）地磁力線出現部分失（shī）真形成磁極。其長處（chù）是設備（bèi）進行股本少，值得信賴性高，具備直覺性。毛病是進行操作費用成本（běn）高，無法對進行裂縫更加準確分門別類，開展檢測運行速度較低。
The
principle of magnetic particle method is to realize magnetic field in square
tube material. According to the interaction between leakage magnetic field at
defect and magnetic particle, when there is discontinuity or defect on surface
or near surface, the magnetic line at discontinuity or defect will distort
locally to produce magnetic pole. Its advantages are less investment in
equipment, high reliability and intuition. The disadvantage is that the
operation cost is high, the defect can not be accurately classified, and the
detection speed is low.
四紅外線開展檢測
Four Infrared Detection
借助一再影響電抗（kàng）器，在方管（guǎn）要樣兒形成（chéng）影（yǐng）響脈動（dòng）電流，影響脈（mò）動電流會進行引起進行裂縫地理區域內耗數量更多動能，進行造（zào）成部分熱度進行提出，借助紅外線開展檢測部分熱度（dù），進而決定進行裂縫深度。紅外線開展（zhǎn）檢測（cè）通常可用於水準儀要樣兒的進行裂縫開展檢測，較為違和合開展檢測要樣兒氣不公整非金屬。
Through
high frequency induction coil, induction current is generated on the surface of
square tube. Induction current will cause more electric energy to be consumed in
defect area, causing local temperature to rise. The defect depth can be
determined by infrared detection of local temperature. Infrared detection is
generally used for flattening surface defect detection, not suitable for
detecting surface irregularity metal.
五漏磁開展檢測
Five magnetic flux leakage detection
方管的漏（lòu）磁（cí）開展檢測辦法和磁粉開（kāi）展檢測辦法格（gé）外地好像，可以使用適用範圍、靈敏度和值得信賴性較磁粉開展檢測辦法更強。
The magnetic flux leakage
testing method of square tube is very similar to that of magnetic powder testing
method, and its application scope, sensitivity and reliability are stronger than
that of magnetic powder testing method.
