1、 Sleeve extrusion connection joint:
The joint is formed by the plastic deformation of the steel sleeve of the connecting piece and the tight bite of the ribbed steel bar through extrusion pressure. There are two forms, radial extrusion connection and axial extrusion connection Due to inconvenient on-site construction of axial compression connection and unstable joint quality, it has not been promoted; The radial extrusion connection technology has been widely promoted and used for connecting joints. The sleeve extrusion connection joints used in engineering are all radial extrusion connections. Due to its excellent quality, sleeve extrusion connection joints have been widely used in construction projects in China since the early 1990s
Secondly, conical thread connection joint:
The joint is formed by the specially made conical thread at the end of the steel bar and the conical thread of the connecting piece.
. The birth of cone thread connection technology has overcome the shortcomings of sleeve extrusion connection technology. The tapered thread head is completely prefabricated in advance, and the on-site connection takes up a short construction period. It only needs to be operated with a torque wrench on site, without the need to move equipment or pull wires. It is highly praised by various construction units. However, the quality of the conical thread connection joint is not stable enough Due to the small diameter of the processed thread weakening the cross-sectional area of the base material, the joint strength is reduced, which can generally only reach 85-95% of the actual tensile strength of the base material. There is still a certain gap between China's cone thread connection technology and foreign countries, and the most prominent problem is the single pitch. The pitch used for steel bars with diameters ranging from 16 to 40mm is 2.5mm, while 2.5mm pitch is most suitable for connecting steel bars with diameters of 22mm. The strength of connecting too thick or too thin steel bars is not ideal, especially for cone thread connections with diameters of 36mm and 40mm, which is difficult to reach 0.9 times the actual tensile strength of the base materialFunction 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 problemsBaijian 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