Abstract: Composite deposits consisting of Fe-base alloy F321 powder and WC-Co cemented carbide particles are obtained with a new developed PTA torch that transports WC alloy particles outside the arc transportation. In deposits, WC alloy particles are kept equispaced. These deposits have low defect rates and good external appearance. WC alloy particles exhibit few refusoion and embrittlement-free of deposited layer with few alloys di~sivity,deposit matrixes have a microstructure of martensite+retained austenite+eutectic. Average rate of the deposit defect examined is below 1.5%. The causation and situation of microcracks and voids are analysed in the test.