管道运输作为一种高效的特种运输工具，在油气运输领域发挥着越来越重要的作用。 目前，国内大口径输送管道主要采用螺旋焊钢管施工。 为保证输送管道的可靠运行，必须严格保证所用螺旋钢管的质量。 因此，研究并采用一种行之有效的在线超声波自动探伤系统成为钢管生产企业的必然选择。
与国外相比，我国的检测设备水平相对落后，钢管焊缝的检测基本靠手动或半自动设备进行。 由于检测效率极低，通常只能采用抽查的方法，不可能对每一根钢管都进行完整的检测。 可能的缺陷。
在国际招标活动中，参与招标的钢管生产企业通常需要具备比较完善的检测措施。 虽然一些企业斥巨资从国外引进了一些自动化检测设备，但由于国内生产和检测配套条件的限制，其使用效果往往不尽如人意，结果导致很多进口设备闲置， 很多钱都浪费了。 现状极大地限制了国内钢管生产企业的国际竞争力。
螺旋钢管因其制造工艺成熟、成本低廉，是一种主要用于流体输送管道的钢管。 目前，螺旋钢管的制造一般采用连续成型和埋弧焊的方法。
成型方式有内托式和外抱式两种。 由于这两种成型方法普遍不足，钢管制造后存在较大的残余应力，降低了钢管的承压能力。 经过理论分析，给出了钢管在成型不足时的残余应力计算公式，并通过实际测量成型螺旋钢管的残余应力，验证了本文给出的残余应力计算公式的正确性。 内在支持。 制造和应用起着指导作用。
钢管焊缝的无损检测一直是企业亟待解决的重要难题。 研制适合我国生产条件的自动焊缝检测设备迫在眉睫。 钢管探伤采用不同的超声波方法，其探伤精度差异很大。 由于焊道几何形状的差异以及各种复合缺陷形成的不确定性，使得钢管的超声波探伤难以实现自动化，人为因素的影响也很大。 如何提高探伤结果的有效性和可靠性成为钢管超声波自动探伤的重点。
经过多年的钢管探伤研究和经验，我们开发出集精密探针跟踪系统、单片机技术和钢管螺旋时计算机信号处理功能于一体的全数字化超声波探伤系统。
与传统探伤仪相比，螺旋钢管数字在线超声波自动探伤系统具有以下优点：
(1)检测速度快，可自动检测、计算、记录，还可自动进行深度补偿，自动设置灵敏度。
(2)检测精度高，系统对模拟信号进行高速数据采集、量化、计算和判别，检测精度可高于传统仪器的检测结果。
(3) 记录归档检验，数字超声波探伤仪可提供缺陷图像的检验记录。
（4）可靠性和稳定性高，能够全面、客观地采集和存储数据，并对采集的数据进行实时处理或后处理。 识别对工件质量进行分类，减少人为因素的影响，提高检索的可靠性和稳定性。
(5)焊缝跟踪采用CCD摄像跟踪传感器，具有检测灵敏度高、不怕水、不怕气、简单可靠等优点。
螺旋焊钢管广泛应用于石油化工、热力管网和城市给排水工程，特别是在长输油气管道中。 几乎所有的油田和气田管网都采用螺旋焊接钢管，具有较高的安全性、耐久性和经济合理性。 由于螺旋焊钢管的直径一般不受板宽的限制，可以做成不同规格的板。
英斯特力仪器是一家集研发、生产及销售于一体的 影像测量仪，拉力试验机, 硬度计 ,探伤仪, 粗糙度仪, 测厚仪, 金相设备厂家, 致力于为客户提供更好的检测仪器。
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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