Tthe practical application of ultrasonic wave inspection in welded joint by austenitic stainless steel with carbon steel is presented. It is shown from the experimental results that the high frequency narrow-pulsed lo...Tthe practical application of ultrasonic wave inspection in welded joint by austenitic stainless steel with carbon steel is presented. It is shown from the experimental results that the high frequency narrow-pulsed longitudinal ultrasonic wave inspection technique can detect the defects in deferent sound path and location within the tested welded joint clearly and exactly. The study in the paper may provide a new approach for further application of ultrasonic inspection in coarse-grained materials.展开更多
A manual inspection of large-diameter tubular joints is difficult. As a result a scanner with three degrees of freedom （ DOFs） was developed based on the scanning principle of ultrasonic phased array. The weld traci...A manual inspection of large-diameter tubular joints is difficult. As a result a scanner with three degrees of freedom （ DOFs） was developed based on the scanning principle of ultrasonic phased array. The weld tracing is realized by a 2DOF motion of scanner. The pose of ultrasonic probe is controlled by the third one. The control strategy is put forward based on a programmable multi-axis controller. Four kinds of scanning modes can be implemented simultaneously employing this ultrasonic inspection system. Experiments on reference blocks of tubular joints reveal that the automatic ultrasonic phased array inspection system has the same inspection accuracy as a manual ultrasonic inspection. This system is superior to the manual ultrasonic system in terms of reliability and repeatability. The artificial dejects of weld at tubular joint can be detected accurately with the presented inspection system.展开更多
The Ministry of Foreign Trade and Economic Coop-eration (MOFTEC),the State Administration forIndustry and Commerce (SAIC),the State Economicand Trade Commission (SETC),the Ministry of Finance(MOF),the State Administra...The Ministry of Foreign Trade and Economic Coop-eration (MOFTEC),the State Administration forIndustry and Commerce (SAIC),the State Economicand Trade Commission (SETC),the Ministry of Finance(MOF),the State Administration for Exchange Control(SAEC),the State Taxation Bureau (STB) and the GeneralCustoms Administration (GCA) (hereinafter referred to asCompetent Joint Annual Inspection Agencies) have jointlyissued a circular a few days before which stipulates that,from the year 1997 onwards,a joint annual inspection willbe conducted on FIEs in order to further improve and stan-dardize China’s investment environment,lessen the burdenson the shoulders of enterprises and enhance the level of ad-ministration over FIEs.展开更多
文摘Tthe practical application of ultrasonic wave inspection in welded joint by austenitic stainless steel with carbon steel is presented. It is shown from the experimental results that the high frequency narrow-pulsed longitudinal ultrasonic wave inspection technique can detect the defects in deferent sound path and location within the tested welded joint clearly and exactly. The study in the paper may provide a new approach for further application of ultrasonic inspection in coarse-grained materials.
文摘A manual inspection of large-diameter tubular joints is difficult. As a result a scanner with three degrees of freedom （ DOFs） was developed based on the scanning principle of ultrasonic phased array. The weld tracing is realized by a 2DOF motion of scanner. The pose of ultrasonic probe is controlled by the third one. The control strategy is put forward based on a programmable multi-axis controller. Four kinds of scanning modes can be implemented simultaneously employing this ultrasonic inspection system. Experiments on reference blocks of tubular joints reveal that the automatic ultrasonic phased array inspection system has the same inspection accuracy as a manual ultrasonic inspection. This system is superior to the manual ultrasonic system in terms of reliability and repeatability. The artificial dejects of weld at tubular joint can be detected accurately with the presented inspection system.
文摘The Ministry of Foreign Trade and Economic Coop-eration (MOFTEC),the State Administration forIndustry and Commerce (SAIC),the State Economicand Trade Commission (SETC),the Ministry of Finance(MOF),the State Administration for Exchange Control(SAEC),the State Taxation Bureau (STB) and the GeneralCustoms Administration (GCA) (hereinafter referred to asCompetent Joint Annual Inspection Agencies) have jointlyissued a circular a few days before which stipulates that,from the year 1997 onwards,a joint annual inspection willbe conducted on FIEs in order to further improve and stan-dardize China’s investment environment,lessen the burdenson the shoulders of enterprises and enhance the level of ad-ministration over FIEs.
