The invention discloses a
welding structure performance intelligent evaluation method and
system based on a multi-
modal large model, and belongs to the technical field of
welding. The
system comprises the steps that a data collection and access layer collects multi-
modal data and writes the multi-
modal data into a unified tracing identifier; the preprocessing and calibration alignment layer carries out space-time calibration alignment and outputs an aligned multi-modal sample; the multi-modal
large model layer obtains fusion representation through quality sensing gating fusion, and
uncertainty quantification and distribution external detection are carried out; the mechanism constraint and state
inference layer performs constraint calibration in combination with
knowledge retrieval, and outputs a crack state, a
health index, a residual life interval and a key evidence index; the interpretable and decision support layer outputs confidence and risk levels, triggers a recheck strategy and generates an audit report; and the closed-loop learning and digital ledger layer returns a maintenance
verification result to update a model version. According to the method, space-
time alignment, quality
perception fusion, mechanism constraint reasoning and closed-loop updating can be realized, and accurate state
estimation and explainable evidence can be output.