Currently, the project is widely used welding cooling after annealing disposal to eliminate residual stress, residual stress after welding cooling is an important process of attack, this approach not only a waste of power and simple attack a larger weld residual stresses. Health Stress corrosion cracking is a necessary condition for coexistence of tensile stress and corrosive media, the tensile stress is an important condition for stress corrosion attack.
Stress corrosion of welded pipes in a particular environment as long as the attack ability, heat treatment after welding is a new skill to eliminate residual stresses. Preheated before welding to the data after heat treatment temperature and the welding process, welding pieces continue to insist that the heating temperature, the welding is completed using its thermal insulation cotton so slow cooling. Useful heat treatment after welding can weld residual stress decrease, and the heat treatment temperature is higher, the better to eliminate residual stresses. Post-weld heat treatment can also be useful for the progress of welded steel stress corrosion ability, after the heat treatment temperature is higher, resistance to stress corrosion ability and progress more obvious.
Stress corrosion cracking is a low-stress brittle cracking. Stress corrosion cracking is a petrochemical equipment, especially oil pipeline welded pipe and piling pipe common cause of failure. Stress corrosion cracking is a lag-related damage and the time, this and similar hydrogen delayed cracking completely. As long as there is stress, stress corrosion cracking attack abilities. Such stress can be applied so that the stress, or the process of welding and processing T residual stress introduced, the etching product may be a result of the expansion wedge effects of stress.
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