we have 2mm thickness RA602 CA (UNS N06025) sheet to be welded. The filler wire ERNiCrFe-12 is not available in the region. Can weld using ER NrCrMo-3 which is higher strength filler?
metengr:
Appreciate your analysis on this cracks (shown in the below picture) resulted in type of weld.
Why high CE column flange to beam web Fillet welds have no HAZ /underbead cracks(is because of no restraint????)
Why simple stiffeners' fillet welds inside the high CE column have...
dhengr:
We are using E7018-1 H4. Hope this would be softer enough for the material A992.
Initially we have used E71T1-C H10 and later we stopped FCAW as this diffusible Hydrogen content of max H10 can be one of reason for this cracks.
Agree that the elevated Preheat of 200C will take care of restraint.
How about the CE=0.47 combined with high restraint. Is this 200C still take care of "to avoid high HAZ hardness".
We experienced around 430 HV10, 450 HV10 in HAZ of high CE beam when we cut and tested a production weld macro...
Thanks metengr for the analysis as Underbead cracks. Thanks Weldstan for pointing out the weld sequence.
The preheat of 200C should be of more help. Right sequence of welding of joints.
Metengr, I still have concern about the restraint acting on the joints, why because these cracks are resulting...
Thanks metengr. It should help if we increase the preheat soak area.
The soak area size for preheat we are maintaining is 4 inch. minimum on either side of the joint.
We are presently preheating with propane gas burner. The preheat some times even recorded to 150C. Still then the HAZ cracks...
[img https://res.cloudinary.com/engineering-com/image/upload/v1461851882/tips/IMG_7677-1_txdwl2.jpg
The cracks are not transverse to the weld regions but are parallel. The cracks resulted in HAZ only. The HAZ of the High CE member.
See attached pictures.
We have experienced some weld HAZ cracks in the structural welds with high restraint in our ongoing Process modules structure.
We found high Carbon Equivalent (CE= 0.45 to 0.47%) on some beams (W-sections) W14x16x193 used for columns which are being fillet welded with A36 stiffeners and CJP...
How many heat treated conditions as per the code Sec.VIII div.1? Any thing other than
1. Normalized
2. Normalized and tempered
3. Quenched and tempered
