Surface Hardening
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The valves and seats are always working in high-temperature and corrsion eviroment, and to weld the seatface with Co-base and Ni-base alloys is the most efficient way to improve the performace for a valve or a seat. In 1990s, we imported Plasma welding maching from US and start to weld valves and seats with kinds of alloys. In the past 10 years , over 1 million pcs welded valves and seats has been produced and ran on different kinds fo engiens all over the world.

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