After the steel structure project finished fabrication in the factory, the key factor to ensure its quality and safety is to carry out detailed quality inspection. After passing the inspection, it will be shipped out of the factory to facilitate subsequent installation. Formal steel structure fabrication factories will have quality inspectors to conduct inspections at each step of the processing. Of course, after the fabrication, they will also conduct inspections and verifications from aspects such as materials, dimensions, welding, and anti-corrosion.
Table of Contents
1. Appearance inspection:
Appearance: Check whether there are cracks, interlayers, rust, scratches, etc. on the surface of the steel. If there are any problems, solve them in time.
Dimensions: Check the length, width, thickness, hole position and other dimensions of each component to see if they meet the requirements of the design drawings, using tools such as tape measures, calipers, and laser rangefinders.
Deformation inspection: Check whether the components are deformed by bending, twisting, etc. due to processing or welding, and use a level, theodolite or total station to measure.
Appearance inspection is also the most basic inspection. If there is a problem, rework it in time. Otherwise, it may not be installed at the installation stage, and serious installation problems will occur.
2. Material testing:
Material testing: Check the steel quality certificate, and if necessary, sample for chemical composition analysis (spectrometer) or mechanical property test (tensile, bending, impact test). And material hardness test.
3. 3. Welding quality inspection:
Appearance: The appearance of the weld should be uniform, without cracks, unfused, undercut, pores and other defects.
Instrument testing: Use various welding inspection instruments, such as ultrasonic testing, radiographic testing, and penetration testing, to perform non-destructive testing of welding. At the same time, sample destructive testing of welded components, such as weld tensile test, bending test, impact test, etc.
4. Anti-corrosion testing:
Use a magnetic thickness gauge to check whether the dry film thickness meets the requirements. At the same time, conduct adhesion test and leak coating inspection. Ensure that the anti-corrosion coating meets the requirements and achieves the specified anti-corrosion effect.
5. Pre-installation inspection:
Pre-assemble complex nodes or large components virtually or physically to verify whether the hole positions and interfaces match. Ensure that there are no problems when the components are installed on site.
The above are some of the most basic tests that should be carried out on steel structures after processing. For some foreign customers, third-party testing may be required. All tests are to ensure that the component processing quality is qualified and to prepare for subsequent installation. If the test is not carried out, a series of installation problems may occur when arriving at the site, such as mismatched hole positions, incorrect component sizes, etc., which will not only affect the installation progress, but may also cause safety problems. Therefore, it is necessary to cooperate with qualified factories for steel component processing.