The stress-relieving failure methods adopted by SPA-H steel plates include vibration aging (removal of 30% ~ 55% of stress), thermal aging (removal of 45% ~ 70% of stress), Hauke energy PT aging (removal of 80% ~ 100% Stress).
Vibration aging
Vibration aging treatment is a method commonly used to eliminate the internal residual internal stress of SPA-H weathering steel plate. When the vector sum of the residual internal stress and additional vibration stress in the welding wire exceeds the yield strength of the welding wire through vibration, A small amount of plastic deformation occurs in the welding wire, so that the internal stress in the welding wire can be relaxed and reduced.
Thermal aging
Thermal aging is to heat the SPA-H steel plate to the elastoplastic transition temperature and maintain it for a certain period of time to relax the residual stress of the welding wire, and then reduce the temperature extremely slowly, so that the welding wire is in a low stress state after cooling. The production time shows that if the process parameters are not properly selected during heating, holding and cooling, or if the reasonable process specifications are not strictly followed during operation, the results of stress relief are often not obtained, and even the stress of SPA-H steel plate is increased. .
Hauke energy efficiency
1. Hauke energy aging is currently the most complete aging method to eliminate welding residual stress and produce ideal compressive stress. Energy aging can eliminate 80% ~ 100%.
2. The fatigue strength of the welding joint of the welding wire can be increased by 50% to 150%, and the fatigue life can be extended by 10 to 100 times. The corrosion resistance of SPA-H steel plate in a corrosive environment is increased by about 450%.
3. It can be used to eliminate the welding stress of the welding wire and can completely replace the aging methods such as heat treatment and vibration aging. The treatment process is simple and the effect is stable and reliable.
4. It is not limited by the material, shape, structure, steel plate thickness, weight, and site of SPA-H weather-resistant steel plate, especially in the construction site, welding process and welding repair, it is more flexible and convenient for eliminating welding stress.
5. The welding residual height, pit and undercut at the welding toe can be directly processed into a smooth geometric transition, thereby greatly reducing the stress concentration factor.
6. It can remove the micro-cracks and slag defects at the welding toe to suppress the initiation of cracks in advance.
7. Because Hawk can eliminate stress treatment, it can simultaneously improve several factors that affect the fatigue performance of SPA-H weathering steel plate welding, such as residual stress, micro cracks and defects, weld toe geometry, surface strengthening, etc. At present, the most effective method to improve the fatigue performance of the weld seam has the effect of doing more with less.
8. It is more suitable for stress relief treatment of large-scale structural site welding seam, ultra-high ultra-low welding seam, welding repair welding seam.
9. Environmental protection, energy saving, safety and no pollution, the construction site is more flexible and convenient to use.
