Welder Red Seal · Question
A pressure vessel undergoing fabrication requires welding of 304L stainless steel plates. The welding engineer specifies a maximum interpass temperature of 175 °C. What is the primary reason for this temperature restriction when welding stainless steel?
Controlling the interpass temperature for 304L stainless steel is crucial to prevent sensitization, which is the precipitation of chromium carbides at the grain
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Question: A pressure vessel undergoing fabrication requires welding of 304L stainless steel plates. The welding engineer specifies a maximum interpass temperature of 175 °C. What is the primary reason for this temperature restriction when welding stainless steel?
Answer options: ✅ To prevent carbide precipitation and maintain corrosion resistance
- To increase the rate of cooling and achieve finer grain structure
- To minimize thermal distortion and warpage
- To ensure complete fusion and penetration
Correct answer: To prevent carbide precipitation and maintain corrosion resistance
Explanation: Controlling the interpass temperature for 304L stainless steel is crucial to prevent sensitization, which is the precipitation of chromium carbides at the grain boundaries. This precipitation reduces the chromium available for corrosion protection, making the steel susceptible to intergranular corrosion.
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