Hi all,
I know there is a considerable amount of knowledge within this forum and I would like to get your opinions regarding this material combination.
Background;
Large frame weldment comprised of A572 Grd 50 material. There are several locations where welding 1.5" and 3" pins to the A572 are required.
The location where the 3" pin is located is a box beam type design where the pin passes through both walls and will be fillet welded in 4 locations.
The location of the 1.5" pin is a little more troubling as it is butted up against a 1" plate and has a gusset butted up against the side of it. There would be a fillet weld at the base and a flare bevel groove weld along the gusset.
There is no code requirement for this weldment but I would still like to do a procedure qualifiaction with this material combination.
I plan on using filler material matched to the A572 Grd 50 with a relatively high preheat. Both of the sub-assemblies are small enough for stress releving
but I would prefer to avoid it if possible, however I know it would be the surest way to avoid cracking.
I am pushing for this to be welded in the annealed condition but the designer has not weighed in on the heat treat condition of the 4140 yet.
I will lay out the 2 plans I am considering and hope to get some feedback. Both plans are assuming the annealed condition.
Plan 1.
600F Degree Preheat and Interpass
GMAW ER80S-D2 95%Argon 5%Oxygen
Immediate stress relief at 1100F for an hour per inch of thickness.
Plan 2.
600F Degree Preheat and Interpass
ER70S-2 90% Argon 10% Co2
Short Postheat
Insullation Blanket Slow Cooling
I know some have had success with 309 SS wire so I am open to any criticism or reccomendations. I would also like some reccomendations on a PQR method.
I would like to qualify this to AWS D1.1 but am unsure that I could acheive the required bend radius even with the longitudal dissimilar metal bend specimen.
I do not have much experience with with this 4140 material so I am certainly open to suggestions from people who know this material better than I do!
Thanks in Advance!
I know there is a considerable amount of knowledge within this forum and I would like to get your opinions regarding this material combination.
Background;
Large frame weldment comprised of A572 Grd 50 material. There are several locations where welding 1.5" and 3" pins to the A572 are required.
The location where the 3" pin is located is a box beam type design where the pin passes through both walls and will be fillet welded in 4 locations.
The location of the 1.5" pin is a little more troubling as it is butted up against a 1" plate and has a gusset butted up against the side of it. There would be a fillet weld at the base and a flare bevel groove weld along the gusset.
There is no code requirement for this weldment but I would still like to do a procedure qualifiaction with this material combination.
I plan on using filler material matched to the A572 Grd 50 with a relatively high preheat. Both of the sub-assemblies are small enough for stress releving
but I would prefer to avoid it if possible, however I know it would be the surest way to avoid cracking.
I am pushing for this to be welded in the annealed condition but the designer has not weighed in on the heat treat condition of the 4140 yet.
I will lay out the 2 plans I am considering and hope to get some feedback. Both plans are assuming the annealed condition.
Plan 1.
600F Degree Preheat and Interpass
GMAW ER80S-D2 95%Argon 5%Oxygen
Immediate stress relief at 1100F for an hour per inch of thickness.
Plan 2.
600F Degree Preheat and Interpass
ER70S-2 90% Argon 10% Co2
Short Postheat
Insullation Blanket Slow Cooling
I know some have had success with 309 SS wire so I am open to any criticism or reccomendations. I would also like some reccomendations on a PQR method.
I would like to qualify this to AWS D1.1 but am unsure that I could acheive the required bend radius even with the longitudal dissimilar metal bend specimen.
I do not have much experience with with this 4140 material so I am certainly open to suggestions from people who know this material better than I do!
Thanks in Advance!