Effect of heat treatment on microstructure and mechanical properties of high frequency induction welding joints of thin-walled TA1 welded pipe
Firstly,high frequency induction welding was performed on the thin-walled TA1 welded pipe with a wall thickness of 0.4 mm.Subsequently,the welded joints were subjected to heat treatment at different temperatures for 5 min.Microstructure of the welded joints before and after heat treatment was analyzed using optical microscope and scanning electron microscopy,and the mechanical properties of the welded joints were tested.The results show that the heat treatment significantly changes the microstructure and mechanical properties of the TA1 welded pipe joints.When the heat treatment temperature is 600 ℃,the welded joints undergo complete recrystallization,resulting in smaller grains,a slight decrease in tensile strength,the increase of plasticity,and the tensile fracture surface shows a typical ductile fracture characteristics.This is mainly due to the disappearance of needle like martensite and fine grain strengthening.
TA1high frequency induction welding of pipesheat treatmentmicrostructuremechanical property
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