Hi,Friend
There is no ready made formula for shrinkage calculation for ESSC weld overlay in ID of shell but shrinkage assumption is on the basis of experience and data recorded
Shrinkage depends upon Thickness of the base metal, Strip size i.e. 30,60,90 mm width,used
Current used etc
Generaly lower width with lower thickness of base metal and higher ID of a shell will have more shrinkage than Higher thk base metal with higher width strip used
You will find more shrinkage for a thickness of 50mm -100mm thk shell with ID above 2.5mtr than >100mm thk shell
My experience of shrinkage allowance is about 2.5/ 3mm/meter you take circumstantially or In other word ID will contract /shrink about 3mm/mtr in dia
Regards
Hegde Prakash
On Wednesday, 20 September 2017 12:16 PM, 'Thaksen Ingole' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Dear Members,
I would like to know how to calculate the weld overlay shrinkage. For eg. We are performing a weld overlay of SS 347 on SA-387 11 2 plates with an ESW process. The weld overlay will be done after the plate is rolled. The ID of the plate is 2500mm. So what shall be the rolled ID prior to weld overlay so that after weld overlay the ID shall not be less than 2500. If its slightly bigger that would be acceptable but should not be too big else we shall waste time and material.
Could someone guide me to know the formula for the weld shrinkage of the weld overlay.
Thanks and Regards
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