larity cold metal transfer arc-brazing method using ERCuSi-A wires. The effects of the thermal distribution strat

egy on the welding process, penetration ratio, microstructure, and tensile strength are investigated by varying

the electrode positive/electrode negative (EP/EN) ratio. With the ratio decreasing, more energy is conducted to

the wire, thereby decreasing the high-temperature holding time. When the ratio decreases from 8:1 to 1:8, the

thickness of the Ti-6Al-4V/seam transition zone containing a Ti\\Cu interlayer and Ti5Si3 intermetallic layer de

creases from 118 to 81 μm. Along with the decrease in the interlayer thickness, the joint tensile strength initially

increases from 216.28 to 261.69 MPa and then decreases to 211.29 MPa. A high EP/EN ratio results in a thick Ti-

6Al-4V/seam transition zone that includes a Ti5Si3 layer. A low EP/EN ratio results in a thin Ti-6Al-4V/seam tran

sition zone that includes Ti5Si3 distributed in the grain boundary. Both conditions reduce the tensile strength of

the joints. The highest tensile strength is obtained when the ratio is 8:8, under which a thin transition zone and

concentrated Ti5Si3 intermetallic layer can be generated.