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Zhu X.,Jiaxing Special Equipment Inspection Institute | Pan J.,Jiaxing Special Equipment Inspection Institute | Tan L.,Shanghai JiaoTong University
FENDT 2013 - Proceedings of 2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application | Year: 2013

In this paper, defects often found in the thermal fusion welds of high-density polyethylene (HDPE) piping were identified by microwave scan inspection and true density tests. The sound thermal fusion welds without defects were inspected by microwave scan technique. The obtained microwave interference pattern and the scan image produced were taken as the evaluation standard. Then the thermal fusion welds containing different defects were inspected and the resultant scan images were different from the standard image of the sound weld. In addition, true density tests were performed for the defect-containing welds to provide supplementary evidences. The results of microwave inspection and true density tests demonstrate that some common defects in thermal fusion welds of HDPE piping can be detected and identified using the microwave scan method in combination with the true density measurement. © 2013 IEEE.


Zhu X.W.,Jiaxing Special Equipment Inspection Institute | Pan J.P.,Jiaxing Special Equipment Inspection Institute | Tan L.J.,Shanghai JiaoTong University
Applied Mechanics and Materials | Year: 2013

In this paper, microwave scan inspection was employed to detect the lack of fusion defect existing in the thermal fusion welds of high-density polyethylene (HDPE) piping. The thermal fusion welds without defects were firstly inspected by microwave scan technique. The obtained microwave interference pattern and the scan image produced were taken as the evaluation standard. Then the thermal fusion welds containing lack of fusion defects obtained under different welding conditions were inspected, and the corresponding scan images were recorded. The problems occurring in the welding processes that lead to lack of fusion defects in thermal fusion welds can be distinguished by analyzing the scan images. Mechanical tests were performed to confirm the effectiveness and reliability of the microwave scan method in detecting the lack of fusion defects in thermal fusion welds of HDPE piping. © (2013) Trans Tech Publications, Switzerland.


Pan J.P.,Jiaxing Special Equipment Inspection Institute | Zhu X.W.,Jiaxing Special Equipment Inspection Institute | Tan L.J.,Shanghai JiaoTong University
Applied Mechanics and Materials | Year: 2013

In this paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipeline based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds were examined in a proper position by frequency sweep within the range of 9.3-9.9 GHz. At a frequency that was most sensitive to the cold weld defects, the measured reflection coefficient S11 exhibited significantly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make identification of the cold weld defects possible. This work provides a basis for inspection of defects in HDPE piping welds. © (2013) Trans Tech Publications, Switzerland.


Tan L.,Shanghai JiaoTong University | Pan J.,Jiaxing Special Equipment Inspection Institute | Wan A.,Shanghai JiaoTong University
Colloid and Polymer Science | Year: 2012

The effect of ultrahigh molecular weight polyacrylonitrile (UHMWPAN) on the shear and extensional rheological behavior of PAN solutions were studied. The PAN solutions were prepared by dissolving medium molecular weight polyacrylonitrile in dilute UHMWPAN/dimethyl sulfoxide solutions. The results of shear rheological measurements indicated that the existence of UHMWPAN reduced the shear-thinning but increased the characteristic relaxation time and the elasticity of PAN solutions. Moreover, the PAN solutions containing UHMWPAN exhibited much more evident strain-hardening behavior than the solution without UHMWPAN. It was found from the results of extensional rheological measurements that the strain hardening and elasticity of PAN solutions increased greatly with the increase of molecular weight or content of UHMWPAN in the solutions. PAN solutions containing a small amount of UHMWPAN have better drawability and favor the increase of jet stretch ratio in dry-jet wet spinning of PAN precursor fibers. © 2011 Springer-Verlag.


Pan J.P.,Jiaxing Special Equipment Inspection Institute | Zhu X.W.,Jiaxing Special Equipment Inspection Institute | Tan L.J.,Shanghai JiaoTong University
Applied Mechanics and Materials | Year: 2013

In the present paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipelines based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds containing cold weld defects caused by insufficient heating time were examined by frequency sweep within the range of 9.2-9.9 GHz. At the frequencies that were most sensitive to the cold weld defects, the measured reflection coefficient S11 showed greatly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make the detection of the cold weld defects possible and feasible. This work provides insights for non-destructive testing of technical defects in HDPE piping welds. © (2013) Trans Tech Publications, Switzerland.


Cheng H.,Yangzhou University | Cheng H.,CAS Shenyang Institute of Metal Research | Pan J.,Jiaxing Special Equipment Inspection Institute | Chen W.,CAS Shenyang Institute of Metal Research | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2011

LaNi 5-xAl x (x=0, 0.25, 0.75, 1.2) alloys were prepared by vacuum induction melting. The microstructure, mechanical property, cyclic stability of hydrogen absorption/desorption and pulverization resistance of the alloys were investigated. The results demonstrate that the addition of Al element can markedly improve the stability of crystal structure and hydrogen storage capacity of the alloys; with increase of the Al content, the pulverization resistance of the alloys becomes worse at first, and then is improved; mechanical property, which is the main factor, and hydrogen storage capacity jointly influence pulverization resistance property of the alloys; in the atmosphere of ordinary high-purity hydrogen, the main reason for the capacity attenuation of the LaNi 5-xAl x (x=0-1.2) alloys should be their intrinsic properties, mostly maybe the disproportionation reaction. © 2011, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Pan J.,Jiaxing Special Equipment Inspection Institute | Pan B.,Jiaxing Special Equipment Inspection Institute | Cheng H.,Yangzhou University | Zhu X.,Jiaxing Special Equipment Inspection Institute | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

High-temperature accelerated aging was employed to simulate the evolution process of pearlite spheroidization of 15CrMoG steel tubes, and the brinell hardness of the samples with different degrees of spheroidization was measured. Field tests were also used to analyze the hardness and spheroidization of the 15CrMoG steel tubes. The relationship model between the hardness and the pearlite spheroidization was established based on Matlab simulation software. The correlation among the pearlite spheroidization of the 15CrMoG steel, the temperature and the time was presented, and a new efficient life evaluation method for power station steel tubes was proposed.


Li C.,Yangzhou University | Cheng H.,Yangzhou University | Pan J.,Jiaxing Special Equipment Inspection Institute | Wang M.,Yangzhou University
Advanced Materials Research | Year: 2013

The basic principle of the hydrogen storage alloy PCT (Pressure-Composition-Temperature) measuring apparatus is introduced in this article. And the method of 3D virtual design in the hydrogen storage alloy PCT measuring apparatus based on SolidWorks software is described. The conceptual design of the system is conducted by Visio software. And the design, assembly, commissioning and optimization of parts is conducted by SolidWorks and the valve, gas piping, sample room, measuring apparatus are improved. Eventually it is found that the reliability and development efficiency of the measuring system can be effectively improved. © (2013) Trans Tech Publications, Switzerland.


Zhu X.,Jiaxing Special Equipment Inspection Institute | Zhu X.,Yangzhou University | Cheng H.H.,Yangzhou University | Shen M.H.,Jiaxing Special Equipment Inspection Institute | Pan J.P.,Jiaxing Special Equipment Inspection Institute
Advanced Materials Research | Year: 2013

Tensile test at ambient temperature, tensile test at high temperature and high temperature tensile creep test were carried out before remnant life prediction. According to the high temperature tensile creep test data, the relationship between working stress, working temperature and rupture life was obtained by MATLAB surface fitting tool. In order to obtain the temperature field and stress field of the superheater tube, ANSYS software was used. Then, the remnant life of the superheater tube was predicted by the extrapolating method and the relationship between working stress, working temperature and rupture life. © (2013) Trans Tech Publications, Switzerland.


Zhu X.W.,Jiaxing Special Equipment Inspection Institute | Zhu X.W.,Yangzhou University | Cheng H.H.,Yangzhou University | Shen M.H.,Jiaxing Special Equipment Inspection Institute | Pan J.P.,Jiaxing Special Equipment Inspection Institute
Advanced Materials Research | Year: 2013

A new method of determination of C parameter of Larson-Miller equation was introduced. For 15CrMo steel, the optimal value of parameter C in the equation was derived. The reliability of the obtained results was analyzed. © (2013) Trans Tech Publications, Switzerland.

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