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                  分析方管表面缺陷的五種檢測方法

                  發布時間:2019-04-21人氣:175
                    北京市場方管價格小幅跟漲價格或報穩為主北京市場方管價格小幅跟漲。今日原料鋼坯以及帶鋼價格一早就出現拉漲,受此帶動,北京市場方管價格小幅跟漲,漲幅20元。但據貿易商反饋,今日是“五一”小長假前的最后一 天交易日,市場總體成交不暢,終端采購放…

                  方管表面缺陷的檢測方法,主要有以下五種:一電渦流檢測.電渦流檢測有多種形式,常用的有常規渦流檢測、遠場渦流檢測、多頻渦流檢測和脈沖渦流檢測等,利用電渦流傳感器對金屬進行感應,方管表面不同缺陷類型和形狀將產生不同類型的信號。其優點是檢測精度高、探測靈敏度高,檢測速度快,能檢測待檢測管材的表面及亞表面,且不受待檢測方管表面油污等雜質的影響。缺點是易將非缺陷結構判定為缺陷,誤檢率較高,檢測分辨率不容易調整。

                  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. 二超聲波檢測

                  Two-Ultrasound Detection

                  利用超聲波進入物體遇到缺陷時,一部分聲波會產生反射,發射和接收器可對反射波進行分析,就能異常精確地測出缺陷來。超聲波檢測常用于鍛件檢測,檢測探傷靈敏度高,但是不易檢查形狀復雜的管材,要求被檢查的方管表面有一定光潔度,并需有耦合劑充填滿探頭和被檢查表面之間的空隙。

                  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.

                  三磁粉法檢測

                  Detection by three magnetic powder method

                  磁粉法檢測的原理是在方管材料中實現磁場,根據缺陷處的漏磁場與磁粉的相互作用,當表面和近表面有不連續或缺陷時,則在不連續處或缺陷處磁力線發生局部畸變產生磁極。其優點是設備投資少,可靠性高,具有直觀性。缺點是操作成本高,不能對缺陷準確分類,檢測速度較低。

                  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.

                  四紅外線檢測

                  Four Infrared Detection

                  通過高頻感應線圈,在方管表面產生感應電流,感應電流會導致缺陷區域消耗更多電能,引起局部溫度升高,通過紅外線檢測局部溫度,從而確定缺陷深度。紅外線檢測一般用于平直表面的缺陷檢測,不適合檢測表面不平整金屬。

                  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.

                  五漏磁檢測

                  Five magnetic flux leakage detection

                  方管的漏磁檢測方法和磁粉檢測方法非常相似,適用范圍、靈敏度和可靠性較磁粉檢測方法更強。

                  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.

                    天津本地鍍鋅方管價格穩中震蕩趨穩出貨為主天津鍍鋅方管市場觀望出貨。期螺方面,期螺2005午間收3558,跌5跌幅0.14%。低開3547,沖高回落,最高3567,最低3542,持倉減0.4萬手,支撐 3530,壓力3580。雖然早盤期螺沖高回落,但臨近年底方管廠家挺價觀望意愿較強…
                  辛苦整理!轉載請注明來自 http://www.theeventwiki.com/news/xw3/56.html

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