Questions about Table 9 of NB/T47014
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NB/T47014 Table 9, item 1:........ is used for root welding; how should this sentence be understood when evaluated separately?
Let me give you an example: I have an argon arc welding assessment for 13mm material, and its applicable range is 13–26mm; whereas for a submerged arc welding assessment of 40mm material, the applicable range is 16–200mm. Now, when a product has a thickness of 100 mm, ordinary TIG welding cannot be used according to the standard procedures; however, based on this rule, TIG welding can be employed for the root pass, while submerged arc welding can be used for the cover pass.
The person upstairs is really an expert; they’ve learned well.