Introduction:
Corrosion is a major concern in the construction industry, especially when it comes to weathering steel plate joints in outdoor environments. Weathering steel plates are made of low alloy steel that develops a protective oxide layer when exposed to air and moisture.
However, during welding, this protective layer is destroyed, leading to increased susceptibility to corrosion. The corrosion behavior of weathering steel plates can be affected by various factors, including strain rate.
In this study, we investigated the effect of strain rate on the corrosion behavior of welded joints of A588 Grade B weathering steel plate.
Experimental procedure:
The experimental procedure involved using A588 Grade B weathering steel plates with a thickness of 10 mm. The plates were cut into size 60mm x 15mm x 10mm and welded together using gas tungsten arc welding (GTAW) technique.
The welding process was carried out at a temperature of 180°C and a welding current of 100 A. The shielding gas used was argon with a flow rate of 10 L/min.
The welded joints were then subjected to corrosion testing using the electrochemical corrosion test method. The tests were conducted at different strain rates, including 0.01 mm/min, 0.1 mm/min, 1 mm/min, and 10 mm/min.
Results:
The results indicate that the corrosion rate of the welded joints increased with increasing strain rate. The corrosion rate was highest at a strain rate of 10 mm/min and lowest at a strain rate of 0.01 mm/min.
This can be attributed to the fact that higher strain rates result in increased deformation of the steel, which leads to the formation of microcracks in the metal. These microcracks act as sites for corrosion initiation and propagation.
Additionally, higher strain rates result in increased heat input during welding, which can lead to the formation of brittle regions in the welded joint. These brittle regions are more susceptible to corrosion than the ductile regions of the joint.
Conclusion:
In conclusion, this study has shown that the corrosion behavior of welded joints of A588 Grade B weathering steel plate is affected by strain rate. The corrosion rate was found to increase with increasing strain rate, indicating that higher strain rates result in increased susceptibility to corrosion.
Therefore, it is important to consider the effects of strain rate when designing and constructing welded joints of weathering steel plates in outdoor environments. This can be achieved by controlling the welding process to minimize deformation and heat input, thereby reducing the likelihood of microcrack formation and the formation of brittle regions in the welded joint.
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