PTA welding is applied to deposit Ni-based and Co-based materials on the key parts in petroleum and chemical industry, for the purpose of surface modification. The test shows that this process is played an important role in upgrading the materials performance of anti-wear, anti-corrosion and high temperature resistance, prolonging service life, saving expensive materials and reducing production cost. Key words: PTA, Deposit, Alloy Powder, Petroleum Industry, Chemical Industry

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