管道運輸作為一種高效的特種運輸工具，在油氣運輸領域發(fā)揮著越來越重要的作用。 目前，國內(nèi)大口徑輸送管道主要采用螺旋焊鋼管施工。 為保證輸送管道的可靠運行，必須嚴格保證所用螺旋鋼管的質(zhì)量。 因此，研究并采用一種行之有效的在線超聲波自動探傷系統(tǒng)成為鋼管生產(chǎn)企業(yè)的必然選擇。
與國外相比，我國的檢測設備水平相對落后，鋼管焊縫的檢測基本靠手動或半自動設備進行。 由于檢測效率極低，通常只能采用抽查的方法，不可能對每一根鋼管都進行完整的檢測。 可能的缺陷。
在國際招標活動中，參與招標的鋼管生產(chǎn)企業(yè)通常需要具備比較完善的檢測措施。 雖然一些企業(yè)斥巨資從國外引進了一些自動化檢測設備，但由于國內(nèi)生產(chǎn)和檢測配套條件的限制，其使用效果往往不盡如人意，結(jié)果導致很多進口設備閑置， 很多錢都浪費了。 現(xiàn)狀極大地限制了國內(nèi)鋼管生產(chǎn)企業(yè)的國際競爭力。
螺旋鋼管因其制造工藝成熟、成本低廉，是一種主要用于流體輸送管道的鋼管。 目前，螺旋鋼管的制造一般采用連續(xù)成型和埋弧焊的方法。
成型方式有內(nèi)托式和外抱式兩種。 由于這兩種成型方法普遍不足，鋼管制造后存在較大的殘余應力，降低了鋼管的承壓能力。 經(jīng)過理論分析，給出了鋼管在成型不足時的殘余應力計算公式，并通過實際測量成型螺旋鋼管的殘余應力，驗證了本文給出的殘余應力計算公式的正確性。 內(nèi)在支持。 制造和應用起著指導作用。
鋼管焊縫的無損檢測一直是企業(yè)亟待解決的重要難題。 研制適合我國生產(chǎn)條件的自動焊縫檢測設備迫在眉睫。 鋼管探傷采用不同的超聲波方法，其探傷精度差異很大。 由于焊道幾何形狀的差異以及各種復合缺陷形成的不確定性，使得鋼管的超聲波探傷難以實現(xiàn)自動化，人為因素的影響也很大。 如何提高探傷結(jié)果的有效性和可靠性成為鋼管超聲波自動探傷的重點。
經(jīng)過多年的鋼管探傷研究和經(jīng)驗，我們開發(fā)出集精密探針跟蹤系統(tǒng)、單片機技術(shù)和鋼管螺旋時計算機信號處理功能于一體的全數(shù)字化超聲波探傷系統(tǒng)。
與傳統(tǒng)探傷儀相比，螺旋鋼管數(shù)字在線超聲波自動探傷系統(tǒng)具有以下優(yōu)點：
(1)檢測速度快，可自動檢測、計算、記錄，還可自動進行深度補償，自動設置靈敏度。
(2)檢測精度高，系統(tǒng)對模擬信號進行高速數(shù)據(jù)采集、量化、計算和判別，檢測精度可高于傳統(tǒng)儀器的檢測結(jié)果。
(3) 記錄歸檔檢驗，數(shù)字超聲波探傷儀可提供缺陷圖像的檢驗記錄。
（4）可靠性和穩(wěn)定性高，能夠全面、客觀地采集和存儲數(shù)據(jù)，并對采集的數(shù)據(jù)進行實時處理或后處理。 識別對工件質(zhì)量進行分類，減少人為因素的影響，提高檢索的可靠性和穩(wěn)定性。
(5)焊縫跟蹤采用CCD攝像跟蹤傳感器，具有檢測靈敏度高、不怕水、不怕氣、簡單可靠等優(yōu)點。
螺旋焊鋼管廣泛應用于石油化工、熱力管網(wǎng)和城市給排水工程，特別是在長輸油氣管道中。 幾乎所有的油田和氣田管網(wǎng)都采用螺旋焊接鋼管，具有較高的安全性、耐久性和經(jīng)濟合理性。 由于螺旋焊鋼管的直徑一般不受板寬的限制，可以做成不同規(guī)格的板。
英斯特力儀器是一家集研發(fā)、生產(chǎn)及銷售于一體的 影像測量儀，拉力試驗機, 硬度計 ,探傷儀, 粗糙度儀, 測厚儀, 金相設備廠家, 致力于為客戶提供更好的檢測儀器。
Tunnel engineering pipeline transportation, as an efficient means of special transportation, has played a more and more important role in the field of oil and gas transportation. At present, spiral welded steel pipe is mainly used to construct large diameter transportation pipelines in China. In order to ensure the reliable operation of the transportation pipeline, the quality of the spiral steel pipe used must be strictly guaranteed. Therefore, it is an inevitable choice for steel pipe manufacturers to study and adopt an effective on-line ultrasonic automatic flaw detection system.
Compared with foreign countries, the level of detection equipment in China is relatively backward, and the detection of steel pipe welds is basically carried out by manual or semi-automatic equipment, because the detection efficiency is very low, usually can only use spot check method, unable to fully detect the possible defects in each steel pipe.
In international bidding activities, are usually required to participate in bidding of steel pipe production enterprises have comparative perfect testing measures, although some companies spend billions of dollars some automatic inspection equipment imported from abroad, but due to the limitation of domestic form a complete set of production and testing conditions, its use effect is often not ideal, as a result, many imported equipment idle, A lot of money was wasted. The current situation has greatly restricted the international competitiveness of domestic steel pipe manufacturers.
Because of its mature manufacturing process and low cost, spiral steel pipe is mainly used in fluid conveying pipeline. At present, continuous forming and submerged arc welding are widely used to manufacture spiral steel tubes.
There are two kinds of forming methods: inner bearing type and outer holding type. Because these two kinds of forming methods are generally insufficient forming, the steel pipe after manufacturing has a lot of residual stress, reducing the bearing capacity of the steel pipe. Through theoretical analysis, the formula for calculating the residual stress of steel tube in the condition of insufficient forming is given, and the correctness of the formula is verified by the actual measurement of the residual stress of spiral steel tube formed by inner bearing type, which has guiding effect on the manufacture and application of spiral steel tube.
Nondestructive testing of steel pipe weld is an important problem which is difficult to be solved by all enterprises. It is urgent to develop an automatic welding seam testing equipment which is suitable for the production conditions of our country. Different ultrasonic methods are used for flaw detection of steel pipes, and their accuracy varies greatly. It is difficult for ultrasonic automatic flaw detection of steel pipe due to the difference of welding pass geometry and the uncertainty caused by various compound defects. How to improve the validity and reliability of testing results has become the focus of ultrasonic automatic testing of steel pipes.
Through investigation and many years of steel pipe flaw detection experience, a digital ultrasonic flaw detection system is developed, which adopts precise probe tracking system, single chip microcomputer technology and computer signal processing function.
Compared with the traditional flaw detector, the digital on-line ultrasonic automatic flaw detection system of spiral steel pipe has the following advantages:
(1) Fast detection speed, can automatically detect, calculate, record, but also can automatically depth compensation and automatically set sensitivity.
(2) High detection accuracy. The system carries out high-speed data acquisition, quantization, calculation and discrimination for analog signals, and its detection accuracy can be higher than the detection results of traditional instruments.
(3) Record and file detection, digital ultrasonic flaw detector can provide detection records until the defect image.
(4) high reliability, good stability, can comprehensively and objectively to collect and store data, and the collected data in real time or after processing, the signal in time domain, frequency domain, or image analysis, but also through the workpiece quality grading pattern recognition, reduce the influence of artificial factors, improves the reliability and stability of the retrieval.
(5) USE CCD camera tracking sensor for welding seam tracking, it has the advantages of high detection sensitivity, not afraid of water, not afraid of gas, simple and reliable.
Spiral welded steel tubes are widely used in petrochemical, thermal pipe network and urban water supply and drainage engineering, especially in long-distance transportation of oil and natural gas pipelines. The pipe network of oil field and gas field almost all uses spiral welded steel pipe, which has high safety, durability and economic rationality. As the pipe diameter of spiral welded steel pipe is generally not limited by the width of the plate, it can be made of a variety of different specifications of the plate.
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