welding of nickel chromium steels
welding of nickel chromium steels
(OP)
welding of an austenitic type steel with a 309 lsi wire is causing a crack in the fusion zone. pre-heats are around 180c and post heat is around 220c for 8 hours. Welded parts are under vibration and shock stress. I'am told that introducing any other type of filler will cause a martensitic structure and therefore cause cracking.
Is there a Mig Wire better than 309 LSI
Is there a Mig Wire better than 309 LSI





RE: welding of nickel chromium steels
However, in the meantime, try welding with 316L or 317L , both have slightly less chromium and a fair amount of nickel and Moly.
RE: welding of nickel chromium steels
In which case your welding consumable should be OK. Is the cracking occurring during welding or in service. You don’t mention any stress relief which is normal for martensitic material. It may benefit from higher heat input during welding, try stick welding instead of MIG.
Have fun
www.gowelding.com ; Technical information in the field of welding
RE: welding of nickel chromium steels
C SI MN P S CR NI MO V
.35 .55 1.25 .55 .15
.50 .40 .85 .02 .02 1.25 .85 .30
Min & Max
Plate thichness 32mm
I'am told it's an austenitic structure?
No corrosive enviroment and operating temp to 60c
RE: welding of nickel chromium steels
Try these welding electrodes:
SMAW 8018-B2
FCAW E 80T1-B2 or B2X
GMAW ER 80S-B2 or B2L
Post Weld Heat Treatment 620-737 C
Hold time for 25mm thickness – 1 hour
Cooling rate to 95 C – 95C/hr/25mm thickness – 95C/hr min
Rich
RE: welding of nickel chromium steels
Also, interruptions of welding in which the weld is allowed to cool to room temperature should be avoided. If welding is interrupted, a “Bake-Out” is suggested. Usually heat the weldment to 315 C for 1-2 hours then allow to cool to room temperature.