Tubes may be seal welded into fittings or...

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Question 1 of 205eccefa0bacbc34ba4d46ca2

Tubes may be seal welded into fittings or headers of boilers and superheaters after they have been expanded and flared, provided the material in the fitting or header does not contain carbon in excess of __________.

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🔍 Key Concepts

• Seal welding of boiler tubes after expansion and flaring • Effect of carbon content in steel on weldability and cracking risk • U.S. Coast Guard requirements in 46 CFR for boiler construction materials

💭 Think About

• How does increasing carbon percentage in steel generally affect its weldability and tendency to crack in service? • Among the choices, which carbon content values are more typical for low-carbon weldable steels used in pressure parts? • Think about whether regulatory limits tend to be set conservatively below common industry practice or right at the upper edge.

✅ Before You Answer

• Compare each answer to the typical maximum for low‑carbon steel used in boilers (well below medium‑carbon ranges). • Ask: At what approximate carbon level does steel begin to lose good weldability and become more crack‑prone? • Remember that a regulatory limit will usually select a value that provides a safety margin under repeated heating and cooling cycles.

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