Valve seat and valve body welding process
A welding process and valve body technology, which is applied in the welding process field of three-way valve seat and valve body assembly welding process of supercritical thermal power units, and can solve problems such as difficult welding
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[0029] A valve seat and valve body welding process, the process is:
[0030] 1. Use ER90S-B9 welding wire;
[0031] 2. Clean up the dirt near the groove and the groove;
[0032] 3. Preheating: the temperature is 230°C;
[0033] 4. Multi-layer welding is adopted, and the multi-layer rear layer eliminates hydrogen on the front layer. The temperature between the control layers cannot be lower than the preheating temperature.
[0034] The interlayer temperature is 200-250°C;
[0035] 5. Control heat input: use the method of small welding current and faster welding to control heat input, and the welding current is
[0036] 220-240A, welding voltage is 13-15V, welding speed is 100-150mm / min;
[0037] 6. Inert gas protection: the gas flow rate is 10-15L / min;
[0038] 7. Post-heat treatment: post-heat treatment is carried out immediately after welding, the post-heat temperature is 300°C, and the heat preservation is 1h.
[0039] 8. Heat treatment: the heat treatment temperature ...
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