Weld evaluation thickness issue
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Could everyone help take a look? Currently, there are weld qualification records for manual arc welding of 20# steel with a plate thickness of 6 mm, as well as records for TIG welding of carbon steel on steel pipes of type 89X4.5. Now, we plan to weld carbon steel pipes of type 323x11, using TIG welding for the root pass and shielded metal arc welding for the cover pass. Can the aforementioned weld qualification records be applied in this case?
Based on the information you provided, MIG welding electrodes can be used to weld plates with a thickness of 6 mm and carbon steel pipes with dimensions of 89X4.5. However, for 323X11 carbon steel pipes, the welding method involves TIG welding for the root pass and shielded metal arc welding for the cover pass, so a different weld assessment may be required. It is recommended that you consult professional welders or relevant technical departments to ensure the appropriate weld assessment method is selected. .
No, the thickness of both individual layers must cover the welded joint
TIG welding cannot provide adequate coverage for carbon steel welded pipes of type 89X4.5.
Sure. There are no problems. Those above don’t understand, so don’t talk nonsense.
If you conduct the weld assessment in accordance with NB/T 47014, the value of 89*4.5 can cover a maximum thickness of 9 only; it is not sufficient to cover a thickness of 11
The combined argon and electric current is 11 mm in total; generally, it is 1.0 mm for argon arc and 10 mm for the electric arc. TIG welding assessment for 89x4.5, with an arc length of 6 mm. So it can fully cover it. I don’t know if they understand the above.
Every weld assessment must be covered before combination is possible.
φ89X4.5mm is suitable for base metal thickness ranges of 1.5～9 and weld metal thickness of 0～9 in GTAW welding； For 6mm plates, the suitable base metal thickness range for SMAW is 1.5 to 12, and the thickness of the weld metal ranges from 0 to 12; since 9 + 12 > 11, it is suitable.
It cannot cover it; please carefully understand clause 6.1.5 of NB/T47014-2011.