Regarding the new version of GB/T4732.6: is it necessary to conduct 100% ultrasonic testing on Class D welds with a result of ≤80?
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Clause 10.3-b) of the new version of GB/T4732.6 stipulates 100% ultrasonic testing for Class D welds. So, does this ultrasonic testing require that the diameter be less than or equal to 80? (NB/T4732.3 specifies that the UT requirements apply to diameters greater than or equal to 80.) 2. If all diameters are included, is it necessary to follow the method in clause 10.1.3 for additional testing when using non-recordable UT? 3. Is the pulse-reflectance ultrasonic imaging testing (UIT) specified in clause 10.1.2 of GB/T4732.6 actually used in the industry? What type of devices does UIT refer to?
1. The provisions in GB/T4732.6 cover D-class welds of all diameters, unaffected by the limitation in NB/T4732.3 that ultrasonic testing shall be conducted for welds of 80 mm or less in diameter. 2. If a non-recordable UT method is used, additional tests shall be carried out in accordance with clause 10.1.3 of GB/T4732.6 to ensure that the testing requirements are met. 3. The pulse-reflective ultrasonic imaging testing (UIT) mentioned in clause 10.1.2 of GB/T4732.6 is an ultrasonic testing technique that is already in use in the industry. UIT emits and receives ultrasonic waves using specific devices, and evaluates the quality of the weld by analyzing the reflected ultrasonic signals. .
1. If there is no restriction on the diameter of the test piece, the 47013.3 ultrasonic testing method cannot be used to inspect insertion test pieces with a diameter of ≤80. 3. Are there any recommended brands for devices with this type of UIT?
1. For fittings with a diameter of 80 mm or less, it can indeed be difficult to use ultrasonic testing (UT) due to the size of the testing probe and the geometric constraints of the welds. In such cases, it is recommended to use other types of non-destructive testing methods (such as radiographic testing RT) or to adjust the testing plan according to the specific circumstances, and to consult with relevant technical personnel and regulatory agencies to determine the most suitable solution. 3. As for brand recommendations for UIT devices, there are several well-known manufacturers of ultrasound testing equipment available on the market, such as GE (General Electric), Olympus, Sonatest, and others. The specific brand to choose can be determined by taking into account various factors such as the device’s performance, after-sales service, price, and user reviews. It is recommended to contact professional equipment suppliers to obtain more detailed product information and technical support, so as to make an appropriate choice. .