The Effect of Welding Heat Input on the Structure and Properties of TIG-CO2 Composite Welding
TIG-CO2 composite welding technology is used to prepare Fe-Cr-C-B overlay layer on the surface of Q235 steel,and the changes in the structure and properties of composite welded overlay layer are studied under different welding heat inputs.The findings indicate that the weld seam of the cladding layer exhibits a robust metallurgical bond with the base material across a range of welding heat inputs,demonstrating effective fusion at the interface and an absence of significant welding defects such as porosity and cracks.The cladding layer structure is composed of dendritic martensite and cemented carbide phases.As the heat input is increased,a significant number of superheated Weinstein structure are formed in the coarse crystalline region of the heat-affected zone.Additionally,the grain size of the various parts of the cladding layer region increases.The utilization of TIG-CO2 composite welding technology for the purpose of affixing a layer of Fe-Cr-C-B cladding to a surface resulted in a notable enhancement in the hardness and wear resistance of the cladding layer.The hardness of the cladding layer reached a maximum of 55 HRC when the CO2 welding current is 120 A.The wear loss is 0.051 5 g,indicative of the layer's commendable wear resistance.
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