Thanks all for the responds. We are qualifying,
Process: GTAW
Tube diameter/thickness: 19.05mm OD/ 2.11mm
45 degrees groove with the tubes expanded before welding
1.6 filler with two passes
We are suspecting that the narrow groove and the fact that the tubes are expanded contributed to the lack...
Dears,
We performed welder qualification mockups for tube-to-tubesheet welding procedure. 15 mockups for three welders (5 each). All of the mockups failed due to lack of penetration and lack of fusion defects as noted from the macro test.
I would like your advise to determine how we can...
