Non-destructive testing of steel structures

, Steel structure non-destructive testing
r br , , MCC Construction Research Institute (Shanghai) Co., Ltd. Steel structure engineering testing includes raw materials, welding materials, welding parts, fasteners, welds, bolts, ball joints, coatings, etc. for steel structures and special equipment All specified test and inspection contents for materials and engineering. Mainly include: steel structure non-destructive testing, main structure engineering testing, steel structure mechanical performance testing, steel structure fastener mechanical performance testing, steel chemical composition analysis, coating raw material testing, salt spray testing and other testing.
Magnetic particle testing
Principle: After ferromagnetic materials and workpieces are magnetized, due to the existence of discontinuities, the magnetic field lines on the surface and near the surface of the workpiece are locally distorted, resulting in a leakage magnetic field, which absorbs the magnetic field applied to the surface of the workpiece. Magnetic powder, which forms magnetic traces that are visible visually under suitable lighting, thus showing the location, shape and size of discontinuities. Applicability and limitations:
Magnetic particle inspection is suitable for detecting discontinuities that are difficult to see visually on the surface and near-surface of ferromagnetic materials with very small gaps and extremely narrow gaps (such as micron-level cracks in length and width). It can also inspect raw materials, semi-finished products, finished workpieces and parts in service. It can also inspect plates, profiles, pipes, rods, welded parts, steel castings and forged steel parts. Defects such as cracks, hair lines, white spots, folded cold insulation and looseness can be found. .
However, magnetic particle testing cannot detect austenitic stainless steel materials and welds welded with austenitic stainless steel electrodes, nor can it detect non-magnetic materials such as copper, aluminum, magnesium and titanium. It is difficult to detect shallow scratches on the surface, deep holes buried in the surface, and delaminations and folds with an angle smaller than the surface of the workpiece.

r br , , MCC Construction Research Institute (Shanghai) Co., Ltd. Housing Quality Inspection Station
China Jingye Engineering Technology Co., Ltd.
Address: No. Guoquan Road, Yangpu District Fortune International Plaza Ginza
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