BAIJIAN - Third party testing organization
Non destructive testing methods for metal structure welds include ultrasonic、 magnetic particle、 radiographic、 leakage、 acoustic emission、 eddy current、 and other common non-destructive testing methods. The following mainly analyzes the application of ultrasonic testing methods in metal steel plate welds in power engineering
Firstly、 remove welding iron filings、 oil stains、 splashes、 and external impurities; Then、 the surface of the probe movement area is smooth and flat、 and the probe can freely scan. If the surface roughness is greater than 6.3 μ M needs to be polished first. Complete the welding and flaw detection of the ultrasonic inspection area by inspecting the appearance. Before conducting inspection work、 flaw detection personnel should have a thorough understanding of the structure、 thickness、 type、 welding method、 groove、 weld seam、 and groove form of the inspected workpiece. When the sensitivity of the leveling line is ≤ the sensitivity of the flaw detection、 the scanning speed should be ≤ 150m/s、 and at least the interval between adjacent probe movements should ensure a 10% overlap of the probe width. On this basis、 combined with the position、 direction、 reflected wave position、 and weld seam of the probe、 determine whether the emitted wave with amplitude exceeding the horizontal line is a defect、 and make corresponding marks
Place the probe on the inspection surface and perpendicular to the center of the weld to detect longitudinal defects、 but ensure that all weld sections and heat affected areas are within the scanning range of the probe's forward and backward movement.
. On the premise that the probe is perpendicular to the weld seam and can move back and forth、 the left and right rotation should be maintained at around 15 °、 and oblique parallel or parallel scanning methods should be used to detect transverse defects in the weld seam and heat affected zone. When the probe and the centerline of the weld seam are located at the edges of both sides of the weld seam and form an angle of about 20 ° for B-ultrasound inspection、 the oblique parallel scanning method should be adopted. On the heat affected zone of the weld、 the probe can be used for parallel scanning from two directions. If the thickness of the base metal of the weld seam is above 100mm、 parallel scanning should be carried out with different angle probe directions on both sides of the weld seam
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific、 fair、 and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsinspection and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered、 meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing、 with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle、 low cost、 and attentive service 7. Possess authoritative qualifications such as CMA、 CNAS、 CAL、 etc 8. The testing report is authoritative and effective、 and is generally used in China