2. Application in ship maintenance
In the maintenance of ships, welding repairs occupy a large proportion, and often the parts to be repaired are also the most severe parts such as fatigue load and seawater corrosion. If these parts are not effectively treated after welding, the residual stress is not treated. The same damage will continue to occur in this area, and even the maintenance cycle will become shorter. At the same time, the use of Hawker's stress-relieving treatment during welding repair can also greatly reduce welding distortion and post-weld cracking. For example, the 4808 factory used this technology in the maintenance of nuclear submarines. The test data indicates that the residual stress value after welding is 200-285Mpa. The residual stress after the stress treatment can be completely eliminated by the Hawker (the residual stress elimination rate is above 99%) And both have become ideal compressive stresses.
Nanjing Jinling Shipyard has repaired all the welds and welds after the repair of a ship in two sea trials in the case of two sea trials where multiple cracks could not be delivered. No cracks were found and the ship was delivered smoothly, and the ship also praised the shipyard's maintenance quality during the subsequent use. Hawker's stress-relieving equipment is also commonly used to eliminate the weld residual stresses caused by casting defects found in the production process of the ship's engine and the wear and corrosion parts found after use.
3. Application on titanium alloy welded parts
Titanium alloy has been widely used in aviation, aerospace, shipbuilding, weapons and other fields. The application of Hawker's ability to eliminate welding stress equipment on titanium alloy welded parts has been widely promoted in recent years, and its application has completely solved the elimination of titanium alloy. The main problem of stress. The test conclusion obtained by a research institute using Hawker's technology to eliminate welding stress is as follows: For the Ti80 alloy cross joint, the fatigue limit of the joint is improved by 64.5%, the joint fatigue life is improved by 13.5 times, and the welding residual stress is reduced by 85. %, the effective stress concentration factor of the welded joint is reduced by 22%.
4. Application in weapons and ammunition and transportation equipment
The AWACS radar produced by a research institute of the Ministry of Electronics has adopted Hawker's stress-relieving equipment in its production and maintenance process. The use of this equipment also greatly facilitates on-site field stress relief after radar welding. Military high-powered three-wheeled motorcycles cannot meet the requirements of the military because of the long-distance, trouble-free operation in the harsh ground environment. By using the Haoke energy-relieving equipment to deal with the important welds of the frame without increasing the material strength grade and the thickness of the material, the fatigue performance is greatly improved and the acceptance requirements are met. Welded structural cartridges and cartridges are often reported for cracks at the welds, and after the cartridges and cartridges are welded, the hammer can be used to relieve the stresses and the welds are treated only once, and no cracking occurs. If the Hawker can be processed on the mouth of the cartridge, the roundness of the mouth of the cartridge can be greatly reduced.
All in all, Hawker's stress-relieving equipment has been used more and more widely in the military field and has solved some of the most difficult problems in the past to eliminate residual stress. It not only has excellent performance in eliminating welding residual stress, but also greatly improves the fatigue performance of welded components.
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