EmWaa
Mechanical
- Aug 17, 2023
- 3
Hi all,
this question concerns a vessel that is in a high vibration area as it is sat immediately below a francis runner in a power scheme.
The wall thickness of the vessel has been measured and is 2mm below the drawing tolerances so the suggestion has been that it could be built back up using a circumferential weld and then finished to the right dimension. Weld build up is a perfectly good repair for a lot of cases, my question is if this is still a good option in an area that sees a lot of radial deflection, or if the weld would work harden and ultimately start cracking at the seam as it undergoes fatigue differently to the base metal.
I have read about welding on machines that in service and vibrating heavily at the point of welding and choosing a consumable with a lower tensile strength to match the base metal is a good idea so it has similar ductility as it goes through life, which makes sense. Has anyone had experience of weld build up on high vibration area? Trying to understand how other industries get around this issue and what repair schemes survive through life ultimately.
TIA
this question concerns a vessel that is in a high vibration area as it is sat immediately below a francis runner in a power scheme.
The wall thickness of the vessel has been measured and is 2mm below the drawing tolerances so the suggestion has been that it could be built back up using a circumferential weld and then finished to the right dimension. Weld build up is a perfectly good repair for a lot of cases, my question is if this is still a good option in an area that sees a lot of radial deflection, or if the weld would work harden and ultimately start cracking at the seam as it undergoes fatigue differently to the base metal.
I have read about welding on machines that in service and vibrating heavily at the point of welding and choosing a consumable with a lower tensile strength to match the base metal is a good idea so it has similar ductility as it goes through life, which makes sense. Has anyone had experience of weld build up on high vibration area? Trying to understand how other industries get around this issue and what repair schemes survive through life ultimately.
TIA
