Microstructure and Properties of BFe10-1-1 Alloy Plates by K-TIG Welding
The welding test of 10 mm thick BFe10-1-1 copper alloy plate was carried out by using Keyhole TIG(K-TIG)process.The results show that the single-side welding and double-side forming was realized,and the weld forming is beautiful.The weld section is free of porosity,lack of fusion,cracks and other defects.The microstructure of the weld zone is mainly dendritic α,which grows and extends from the fusion line to the weld center.The structure of base metal zone and heat affected zone is twin α phase.The closer to the weld,the larger the grain size of the heat affected zone.The hardness value of the weld zone is relatively high.The hardness value from the weld to the base metal decreases first and then increases.Slight softening occurs in the weld zone near the fusion line and the upper area of the backing weld.The average tensile strength of the joint is 346.5 MPa,and the fracture location is the base metal.The bending test was carried out under the test conditions of α=180°and d=4 t,and no cracks are found.
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