本文選題：厚壁鋼管 + 水浸超聲檢測��； 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：厚壁鋼管廣泛應(yīng)用于工業(yè)領(lǐng)域的各種重要場合，由于制作工藝的局限性和使用環(huán)境的惡劣性，厚壁鋼管在加工和使用過程中易出現(xiàn)裂紋、折疊、分層、夾雜等致命缺陷，對其質(zhì)量構(gòu)成嚴(yán)重威脅，容易造成安全隱患。將超聲無損檢測技術(shù)應(yīng)用于厚壁鋼管的缺陷檢測，是保證其產(chǎn)品質(zhì)量、提高生產(chǎn)效率、節(jié)約生產(chǎn)成本的關(guān)鍵。 本文主要針對厚徑比大于0.3的厚壁鋼管存在的超聲檢測技術(shù)難題，開展了水浸法超聲檢測理論及實驗研究，并針對小徑厚壁鋼管進(jìn)行檢測方案設(shè)計及檢測參數(shù)研究。為解決厚壁鋼管變型橫波法內(nèi)壁縱向缺陷檢測時最優(yōu)偏心距難以確定的問題，本文分析入射聲波在管壁內(nèi)傳播路徑，提出了基于聲波在各介質(zhì)分界面能量反/折射系數(shù)二維積分的缺陷回波能量估計方法。該方法能夠給出任意內(nèi)外徑被測管件缺陷回波能量隨偏心距變化關(guān)系曲線，，確定出最優(yōu)偏心距。實際檢測實驗結(jié)果與該方法的計算值一致，驗證了該方法的有效性與可靠性。另外，該方法具有通用性，不局限于用于水浸變型橫波內(nèi)壁縱向缺陷檢測的偏心距優(yōu)化，可以推廣應(yīng)用于其他缺陷檢測偏心距、入射角等參數(shù)的優(yōu)化，且不受被測管件材料、形狀與尺寸或聲束形狀與尺寸的約束。對于檢測參數(shù)正確選取有重要意義。 為滿足小徑厚壁鋼管單件、快速、高精度的檢測需求，本文提出了一套水浸超聲自動檢測系統(tǒng)方案，設(shè)計了機械自動掃查裝置結(jié)構(gòu)，能夠?qū)崿F(xiàn)管體全覆蓋、無端部盲區(qū)檢測。該系統(tǒng)的研制對促進(jìn)適用于單件、成品小徑厚壁鋼管的高精度超聲檢測系統(tǒng)研制領(lǐng)域的發(fā)展具有深遠(yuǎn)意義。
[Abstract]:Thick-walled steel pipe is widely used in various important occasions in the industrial field. Due to the limitation of manufacturing technology and the bad and bad use environment, the thick walled steel pipe is prone to crack, fold, delamination, inclusion and other fatal defects in the process of processing and use. It poses a serious threat to its quality and easily leads to hidden safety problems. The application of ultrasonic nondestructive testing technology to the defect detection of thick-walled steel pipe is the key to ensure the product quality, improve the production efficiency and save the production cost. In this paper, aiming at the technical problems of ultrasonic testing for thick walled steel pipe with thick-diameter ratio greater than 0.3, the theory and experiment of ultrasonic testing with water immersion method are carried out, and the design of testing scheme and the research of testing parameters are also carried out for small diameter thick walled steel pipe. In order to solve the problem that the optimum eccentricity is difficult to determine in the detection of longitudinal defects of thick wall steel tube by the modified shear wave method, the propagation path of incident sound wave in the tube wall is analyzed in this paper. A defect echo energy estimation method based on 2-D integration of energy inversion / refraction coefficient of acoustic wave at the interface of each medium is presented. This method can give the curve of echo energy with eccentricity and determine the optimal eccentricity. The experimental results are in agreement with the calculated values, and the validity and reliability of the method are verified. In addition, the method is universal and not limited to the optimization of the eccentricity for the longitudinal defect detection of the water-immersed S-wave inner wall. It can be applied to the optimization of other parameters such as the detection of eccentricity and the angle of incidence of the defect, and is not subject to the material of the pipe to be tested. Shape and size or sound beam shape and size constraints. It is of great significance for the correct selection of detection parameters. In order to meet the demand of single piece, fast and high precision detection of small diameter thick wall steel pipe, this paper puts forward a set of automatic ultrasonic detection system for water immersion, and designs the structure of mechanical automatic scanning device, which can realize the detection of the blind area of the tube covering completely and without the end. The development of this system is of great significance to the development of high precision ultrasonic testing system for single piece and finished steel pipe with small diameter and thick wall.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG115.285

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