In the 2012 Cost Engineer Examination, the question on "Technology and Measurement (Installation)" specifically addressed the welding method for thin-walled stainless steel pipes. The question was as follows:
**Question 85:** Which welding method should be used for thin-walled stainless steel pipes?
A. Arc welding
B. Submerged arc welding
C. Tungsten inert gas (TIG) welding
D. Argon welding
**Answer: C**
**Teacher's Analysis from Engineering Education Network:** According to textbook page 298, stainless steel pipe welding can be done using manual arc welding or argon arc welding. However, for thin-walled pipes, it is essential to ensure a smooth inner surface after welding. Therefore, full tungsten inert gas (TIG) welding is recommended for thin-walled tubes. For pipes with wall thickness exceeding 3 mm, argon arc welding is typically used instead.
This question tests the candidate’s understanding of appropriate welding techniques based on material thickness and application requirements. TIG welding is known for its precision and clean welds, making it ideal for thin materials where aesthetics and structural integrity are important. It also helps prevent oxidation and ensures a high-quality finish, especially in critical applications such as chemical or pharmaceutical industries.
Understanding the differences between various welding methods is crucial for cost engineers, as it directly impacts project planning, material selection, and overall construction quality. This question highlights the importance of selecting the right technique to meet both technical and economic objectives.
Sources: Textbook Page 298, Engineering Education Network.
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