Weld overlay shrinkage calculation.

[Thaksen Ingole]

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

[Prakash Hegde]

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

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