We are welding SA-516 Gr65 to 516 Gr70, 1-1/2" thick plates with double bevels. We have a 1/4" thick deposit of GTAW (ER70S-2) in the root with the balance of both bevels filled with SAW (F7P5-EM14K), Heat input for the GTAW was 115Kj/in and for the SAW it was 60Kj/in. The plate was divided into two separate plates with one havein a single PWHT cycle at 1150°F for 1-1/2 hrs. and the second plate having three PWHT cycles at the same temperature range with the heating and cooling rates controlled per ASME UCS-56 requirements.
The Charpy inpact numbers all fail in the HAZ and some of the specimens even failed in the weld on the plate with the three PWHT cycles.
The plates were all purchased in the normalized condition with the grain structure perpendicular to the weld.
Anyone care to comment?
Subject:- Charpy impact fail
We are welding SA-516 Gr70 to 516 Gr70, 8 MM thick plates with single bevels. We have a 8 MM thick deposit of GTAW (ER70S-2) in the root with the balance of bevels filled.
Heat input for the GTAW was 1.85 KJ/MM to 2.35 KJ/MM . The interpass temperature was 130 – 150°C.
The Charpy inpact numbers all fail in the HAZ (values are HAZ 1,2 & 3 – 210,206,214 & Energy Absorbed1,2 & 3 – 8,10,18Joules & Average joules Actual-,12,Required- 12 Minimum),Test Temperature = -49°C ,MDMT = -39°C and two specimens even failed in the weld on the plate.
The plates were all purchased in the normalized & impact (-46°c) condition with the grain structure perpendicular to the weld.
Anyone care to comment?
Regard's
Varun Kumar
We are welding SA-516 Gr70 to 516 Gr70, 8 MM thick plates with single bevels. We have a 8 MM thick deposit of GTAW (ER70S-2) in the root with the balance of bevels filled.
Heat input for the GTAW was 1.85 KJ/MM to 2.35 KJ/MM . The interpass temperature was 130 – 150°C.
The Charpy inpact numbers all fail in the HAZ (values are HAZ 1,2 & 3 – 210,206,214 & Energy Absorbed1,2 & 3 – 8,10,18Joules & Average joules Actual-,12,Required- 12 Minimum),Test Temperature = -49°C ,MDMT = -39°C and two specimens even failed in the weld on the plate.
The plates were all purchased in the normalized & impact (-46°c) condition with the grain structure perpendicular to the weld.
Anyone care to comment?
Regard's
Varun Kumar
Did you ever figure out the issue?
To me using a 70 series filler is not suffice for low temp Charpy testing. We usually go with a 80ni filler for those types of procedures. We are having failing charpys at the root fusion line only in 2.5 plate. CTOD requirements are very stringent.