Research on Automatic Ultrasonic C-scan Inspection Technology for Diffusion Welded Joints between Electrical Pure Iron and Stainless Steel
The coil skeleton parts(electrical pure iron+stainless steel)welded by Diffusion welding have been widely used in aerospace products because of the advantages of flat weld interface,high dimensional accuracy,and excellent welding quality.As a precision welding forming technology,Diffusion welding is affected by welding process,surface state,etc.,and its weld interface is prone to some small defects that are difficult to find in routine inspection.If effective detection methods are not taken to find these defects,serious consequences may occur in the use of subsequent products.In this paper,on the basis of not changing the existing welding structure of coil skeleton parts,the water immersion ultrasonic C-scan method is adopted,and the diffusion weld joint scanning imaging is successfully realized by designing the reference block,adjusting the appropriate focus probe,and scanning step.On this basis,the ultrasonic C-scan criteria applicable to the coil skeleton dif-fusion weld are formulated in combination with the product service conditions,tensile and metallographic contrast tests and relevant technical literature,which realizes the non-destructive testing of products and plays an important role in controlling the weld quality.
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