Abstract
The repair reinforcement height is an important parameter of repair welding, which may have a great influence on structural integrity. In this paper, the effects of repair welding reinforcement height on the microstructure, microhardness, residual stresses and stress corrosion cracking (SCC) behavior of a 304 stainless steel-repaired joint were investigated by experimentation and simulation. With an increase of the repair weld reinforcement height, the δ ferrite content in weld and fusion zone is obviously reduced, and the ferrite shape is gradually changed from the skeleton to the worm shape. With the increase of repair welding reinforcement height, the microhardness and residual stresses decrease gradually. The tensile strength and elongation for higher repair weld reinforcement height are larger than those with lower repair weld reinforcement height. The higher the repair weld reinforcement height, the harder it is for SCC to occur. The repair welding in 304 stainless steel is recommended to be repaired no more than two times.
Highlights
In the manufacturing, installation and servicing processes of pressure vessels, some defects are inevitably generated and have a great influence on the safe service of the equipment [1]
It is very important to study the influences of different repair welding parameters on residual stress and stress corrosion sensitivity, which are of great significance to optimizing the repair welding process and improving the service life of the repair structures
Through a careful investigation of residual stress and Stress corrosion cracking (SCC) behavior on as-weld joints [20,21,22,23], we found that there are few studies on the residual stresses and SCC behavior via repair welding a joint experimentally. 304 stainless steel is a very popular engineering repair material due to the merits of corrosion resistance [24,25,26]
Summary
Installation and servicing processes of pressure vessels, some defects (cracks, corrosion pits, wear, etc.) are inevitably generated and have a great influence on the safe service of the equipment [1]. Due to uneven temperature field distribution during welding, the residual stresses are generated inevitably after repair welding, which has a great influence on the later service life of the repair equipment [3]. It is very important to study the influences of different repair welding parameters on residual stress and stress corrosion sensitivity, which are of great significance to optimizing the repair welding process and improving the service life of the repair structures. If the repair welding technology is improper, the local repair area may fail again in Materials 2020, 13, 2434; doi:10.3390/ma13112434 www.mdpi.com/journal/materials
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