6061-T652 Aluminum Weld Repair
6061-T652 Aluminum Weld Repair
(OP)
We have cracked propeller shroud legs machined from 6061-T652 aluminum forged billets. Is 6061-T652 weld repairable (What is the process)?
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6061-T652 Aluminum Weld Repair
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6061-T652 Aluminum Weld Repair6061-T652 Aluminum Weld Repair(OP)
We have cracked propeller shroud legs machined from 6061-T652 aluminum forged billets. Is 6061-T652 weld repairable (What is the process)?
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RE: 6061-T652 Aluminum Weld Repair
Either way, you will probably need to reheat treat the welded component to restore original mechanical properties.
RE: 6061-T652 Aluminum Weld Repair
What process is used to restore to the T652 condition?
RE: 6061-T652 Aluminum Weld Repair
Solution treat at 985 deg F, water quench
Precipitation heat treatment - 345 deg F for 8 hours
For the T652 - see the note below
Stress relieved by 1 to 5% cold reduction subsequent to solution heat treatment and prior to precipitation heat treatment.
You can restore forgings to a T6 condition by simply performing a solution and preciptation hardening treatment by using the same parameters above. You will need to evaluate if this condition is permitted by design.
RE: 6061-T652 Aluminum Weld Repair
RE: 6061-T652 Aluminum Weld Repair
I've had good results when using GMAW in the spray mode when welding multipass grooved joints. The results using GTAW isn't as favorable especially if the weld and HAZ isn't cooled down between passes. In any event, the interpass temperature and the time at temperature must be limited to minimize the width of the HAZ. Cooling the weld and HAZ between weld beads with blowers can be beneficial.
Allowing the 6061 to remain at elevated temperature too long can result in over aging in the HAZ. Over aging does nothing beneficial for the mechanical properties.
Best regards - Al
RE: 6061-T652 Aluminum Weld Repair
Yes, provided you have no fatigue cracks as confirmed by surface NDT of tensile stressed surfaces.
RE: 6061-T652 Aluminum Weld Repair
RE: 6061-T652 Aluminum Weld Repair
The structures have been in service 20 years. Our FEA analysis shows 2 modes of vibration 10 hz forward and aft and 14 hz side to side. Many have been operated in unbalanced conditions. We are installing strain guages to measure the actual stress. Hope our analysis will determine cause.
swall thanks for providing material and surface finish ideas