A welding deformation prediction system and method are disclosed. A welding deformation prediction system according to an embodiment of the present invention includes: a unit member defining unit that defines a plurality of unit members constituting the object based on shape information of the object; A welding deformation analyzing unit for deriving an out-of-plane deformation amount for each of the unit members with respect to an input length; And a prediction data deriving unit for deriving the correction area ratio based on the correction unit unit which is required to be corrected because the out-of-plane deformation amount of the unit members exceeds the allowable amount.
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