Abnormal Detection Method for Heat Affected Zone During Assembly and Welding of Large-span Steel Structure Transverse and Longitudinal Beams
WANG Ning
Abstract：Due to defects in the heat affected zone(HAZ)during the assembly and welding of large-span steel structure transverse and longitudinal beams,a method for detecting abnormal heat-affected zones in these beams is proposed.Q345 carbon steel prefabricated transverse and longitudinal beams are selected as the test material,with abnormal pores deliberately introduced on their surface.Abnormal detection of heat-affected zone is performed using the MOI model eddy current thermal imaging device.The results showed that the temperature difference between the pore area and the adjacent area of the test specimen reached 308.45 K,while the temperature difference between the stomatal area and the adjacent area reached 910K.When the heating power was set to 122kW,this method was able to detect prefabricated pores of various sizes in all specimens,achieving the goal of identifying abnormal areas.
Keywords：large spansteel structure longitudinal beamassembly weldingheat affected zoneeddy current thermal imagingheating power
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 97-102 )